Keywords: Oil, Origin, Migration, Faults, Provenance, Catagenesis, Diagenesis, Fluid Inclusions
The purpose of this paper is to discuss the origin of oil and gas, collectively called petroleum because they are found in rock (petros). There are two models competing for attention in the secular world. The best known is that where living matter is assumed to decay and form oil—hence the name “fossil fuel.” The other model is that of an abiogenic origin—meaning that oil is directly produced from primordial matter.
Because of the interest in the topic, a recent Hedberg Conference turned its attention to the topic, and a summary paper has now been produced (Katz, Mancini, and Kitchka 2008). The conference could not resolve the dilemma—“Which of the models is correct?”. Both models contain subjective assumptions, and so the answer may be neither model is correct, and that a third model is required to cope with all the known data. All three options are explored in this paper.
The science is not particularly difficult. A basic knowledge of geology, a little physics, and some chemistry will suffice. The real problem for most readers will be the mental ascent needed to reject a naturalistic explanation for the origin of oil and replacing it with a biblical one, when for so long we have only heard about naturalistic models.
The oil industry uses units that are not consistently imperial nor metric. Where I am quoting from a particular report I have used the units that the authors of that report have used. To one figure precision, 3 feet equals 1 meter, 5,000 feet equals 1 mile, 1 barrel equals 6 cubic feet. For further details, see Bradley (1984).
The two current models
In the last 80 years, it has become almost universally accepted in western countries that oil and natural gas have a biological origin (Gold 1987, p. 2). Although Gold does not believe this explanation he lists the factors that favour that assumption1:
- Hydrocarbons (a dominant part of petroleum) are clearly identified as break-down products of organic molecules from plants.
- Hydrocarbons show optical activity. They rotate plane-polarized light indicating left-handed molecules are preponderant as found in living organisms.
- Hydrocarbons show preference for odd-numbered alkanes (which is considered to be a feature of “organic oil”).
- Hydrocarbons are found in sedimentary rocks rather than primary rocks.
- Hydrocarbons are found in the line of arcs which are deep-seated crustal structural features.
- Hydrocarbon areas tend to be rich at many depths.
- Deep hydrocarbons show no biological evidence (for example, optical activity or disparity between the even- and odd-numbered alkanes).
- Methane is found where a biological origin is not probable.
- There is no link between the hydrocarbon characteristics across different areas of the world with the geological column.
- There is associated helium (up to 10% in some U. S. reservoirs) alongside the hydrocarbons.
- Many gas reservoirs, particularly in Germany, contain considerably in excess of 50% nitrogen (Barnard and Cooper 1983), which is nonbiological.
- Other reservoirs in the U. S. contain consistent ratios of helium and nitrogen (Osborne 1986) which are also non-biological.
- There are also many Russian dry gas reservoirs which not only contain 20% nitrogen, but also 30% hydrogen (Smith et al 2005).
Gold then lists the reasons why oil should be considered to be of an abiogenic origin (meaning that the precursors are not biological in any shape or form). However, he is not excluding the possibility that minor fractions of oil have a biological origin. He, like the author of this paper, is principally concerned with explaining the origin of the bulk of oil. His list is:
Whilst Gold does not list them, there are additional points that contradict the standard “fossil fuel” model, viz:
There are also the thorny issues of mercury, vanadium and chromium within oils. Though they are present in North Sea oils, they are at relatively lower concentrations compared with world oil. These heavy metals are poisonous to life, but their presence calls into question both models for the origin of oil.
Why have we not settled on one of the naturalistic models?
There are three possible reasons why scientists and engineers may not have settled on one of the naturalistic models:
- It does not matter to many people. An individual can fill up with fuel at a garage, or turn on the central heating (oil or gas), and not even think about where the petroleum products came from. Even within the oil industry, engineers can work on a reservoir to extract all the oil and gas possible, and still not ask the question—how did they get into the reservoir? Admittedly, the regulatory bodies in the United Kingdom will have required oil companies to show, as a particular reservoir approaches exhaustion, that there was no other oil and gas within the region that could be extracted by their wells and other equipment. Only then would they have permission to abandon the project. To some extent, this requirement is driven by Gold’s point 6.
- Positions about the origin of oil are deeply entrenched. Careers and reputations are at stake. It took a lot of effort to get the two opposing sides to meet at the Hedberg Conference (it was postponed several times [Katz, Mancini, and Kitchka 2008]). Some people changed their minds about the origin of oil during the conference, but there was no significant movement to one choice or the other. Not surprisingly, “Little common ground was found between the two models.” Those who supported the biogenic model criticized the abiogenic model because it did not make any useful predictions about volumes and locations of oil. Those who supported the abiogenic model complained that the paradigm that oil is biogenic is “a scientifically vulnerable template acting like a tax on out-of-the-box thinking.”
- While the reader may not be familiar with the detailed science in Gold’s list or read all the Hedberg Conference papers, it is obvious that neither model may be a robust explanation for the origin of oil.
To investigate the topic we start with a consideration of what oil is, and the nature of the reservoirs where oil is found, before examining the details of the individual models. Finally, we shall offer an alternative to those two naturalistic models (meaning that they are set in a secular framework) which meets scientific and biblical requirements. It thereby has the potential to become a positive force in evangelism.
Most of the examples on which the thesis of this paper is based will come from the North Sea and the wide range of reservoirs on the United Kingdom, Norwegian and Danish portions (Glennie 1998). This is because in a 31-year career in the upstream oil industry the author became intimately familiar with many of these reservoirs (see, for example, Fayers, Hawes, and Matthews 1981; Matthews, Carter, and Dake 1992; Matthews, Carter, and Zimmerman 2008) and the people who have studied them. However, there is no indication that any of the conclusions drawn from the North Sea are not appropriate to all other parts of the world. The first task is, however, to remind ourselves of how we use facts to support particular hypotheses.
Necessary and sufficient conditions
To support a particular hypothesis regarding the origin of oil we need a number of facts. However, these facts may not be sufficient to support an individual hypothesis. Consider the syllogism of Socrates (Chilingar et al 2005).
The two facts, Socrates is a man, and all men are mortal, allows us to infer that Socrates is mortal. However, if we state that Socrates is mortal, and Socrates is a man, we cannot infer that all men are mortal from the available evidence. The premises are necessary, but not sufficient, to show that all men are mortal.
To take a particular point about the origin of oil, the literature abounds with comments that certain oils contain biological markers. In reality, this statement is already an inference. We have taken a fact (that oils contain molecules that can be generated in the laboratory from biological material) and made two assumptions. The first is that the molecules in the sample of oil tested had a biological origin. The second assumption is an even bigger step—that all oil molecules had a biological origin.
Circular reasoning is another problem that so easily creeps into scientific discussions. Examples will be discussed below.
The Nature of Oil and Gas
Crude oil is a natural multicomponent mixture (Chilingar et al 2005). The bulk of oil and natural gas consist of a numerically ordered sequence of hydrocarbons, which are molecules of hydrogen (H) and carbon (C) only.
For convenience, it is typical for the hydrocarbons with N atoms of carbon to be written as CN. The names and brief properties of the smaller molecules are listed in Table 1.
|3||Propane||Gas, though liquid under moderate pressure|
|4||Butane||Gas, though liquid under light pressure.|
Oil and natural gas are found together without exception, though the proportions differ. See Table 2 for a typical industry classification.
The contents of one reservoir may be dominated by natural gas, with only a fraction of one percent being liquid oil. These reservoirs may be referred to as dry-gas reservoirs (type 1). Examples include the giant Groningen gas field and the gas fields in the southern North Sea basin (Glennie 1998). The contents of other reservoirs may be dominated by oil (type 4 onwards), with perhaps only a few percent (by weight) being natural gas.
|Type number||Type name||Main composition range||Comments|
|1||Dry gas||C1||Methane ≥ 95%|
|2||Wet gas||C1–C4||Methane ≤ 95%|
|4||Light oil||C1–C25||Most North Sea production|
|7||Heavy oil||Unresolved complex mixture|
The hydrocarbons from a reservoir consist mainly of a special group of hydrocarbons called the alkanes. On occasions, though not typically from the North Sea, the produced fluid will contain carbon dioxide, hydrogen sulfide, helium, hydrogen, and nitrogen. Putting a light North Sea oil into a gas chromatograph yields the result shown in Fig. 1 for the relative amounts of each alkane.2 Very small quantities of nitrogen, and in specific cases mentioned below, larger quantities of carbon dioxide, will also be present, but these are specific to particular areas of the North Sea (for example, Brae, see later).
The nth alkane has the formula CnH2n + 2. Some are straight-chained (the normal alkanes). Others are branched (the iso-forms), with the lightest alkane that betrays this behavior being butane. In consequence they have slightly different thermodynamic properties (such as boiling point). Molecules such as alcohols and carbohydrates, though having a preponderance of carbon and hydrogen atoms, are not found in measurable quantities in reservoir hydrocarbons.
The four lowest alkanes are removed at the reservoir production site, and sold as natural gas, or natural gas liquids (NGLs). The remainder, referred to as stock tank oil, to distinguish it from the fluid that emerges from the reservoir, is sent to the refinery. In a refinery, further separation occurs. Alkanes 6 to 10 typically form petrol (gasoline), alkanes 14 to 18 form diesel fuel, and alkanes 26 onwards form lubricating oil (Krauskopf and Bird 1995). The boundaries and purity are not precise. For example, in summer the refinery will include slightly higher alkanes in its petrol than in winter, because the variations in air temperatures cause changes to the optimum volatility.
Other components of natural oil may include the benzenes, waxes, and the asphaltenes.
The Nature of Petroleum Reservoirs
Oil and gas reservoirs consist of a volume of porous rock (typically one to three miles beneath the ground surface). Fluids occupy the spaces between the grains of sand, limestone and/or chalk.3 Within the pore space there will be oil, gas, and water.
Since oil is much lighter than water, there must be some means of retaining the oil in the reservoir. A typical oil reservoir maybe anticlinally shaped. The oil is prevented from rising out of the reservoir by an impervious cap rock. Oil is prevented from moving out of the reservoir sideways either by the shape of the anticline or some other impervious rock. Maureen is an example of an anticlinal reservoir which will be discussed later—see Fig. 2.
Except for a few specific reservoirs, all the evidence points to oil having been generated elsewhere. Consider the assumption of oil being derived from the decay of biological matter. This biological matter initially resides in another rock formation (the source rock) and the oil generated in those source rocks later flows into the reservoirs where we now find the oil. In the case where oil is assumed to have an abiogenic origin, the oil is generated at depth and rises through the rock sequence in order to enter its present resting place.
The individual parts of a typical reservoir
To understand the origin of oil (and gas) we need, as a minimum, to have a model of the origin of the host reservoirs. It is insufficient to have a model which may be able to explain the origin of the molecules that comprise oil, if that same model fails to explain how the molecules moved from the positions in the rocks where they were created (the source rocks or the depths of the earth) into the reservoirs where we now find them. The sufficiency conditions are not met.
This is not the place to discuss the dating of rocks, but we have to respect the fact that radioactive decay rates have fallen during earth history (DeYoung 2005) and to that extent reservoirs are probably around 4,000–6,000 years old, rather than millions of years old. It is not foundational to the development of a new model for the origin of oil that the rocks are less than 6,000 years old, but as we explore the known facts about oil, we have to review the timescales under which oil and gas have moved within the rocks.
The place to start is with a detailed discussion of the individual components of a reservoir.
The rock grains
The sandstone rock grains that make up the reservoir are assumed to have come from erosion and weathering of topographic highs over a period of millions of years. It would appear that the required massive amounts of weathering cannot be completed in 6,000 years, which is a typical estimate of the age of the earth based on biblical chronologies. Of course, there could have been huge amounts of sediments on the pre-Flood ocean floor, put there when the land was raised by God on creation day 3 causing the original globe-encircling waters to be drained off into the ocean basins. Estimates of the time to weather 1 mm of fresh rock to kaolinitic saprolite are at least 20 years (Krauskopf and Bird, 1995, p. 326). Now while that may suggest that the earth is millions of years old, if sediments are the product of weathering, then the problem is that of explaining how, during the long periods of weathering of the metamorphic rock to sandstone and clays, the substances have not become intimately mixed in rivers, lakes, and on the sea bed. Typical attempts to reconstruct reservoir history (paleo-reconstruction) is a near-impossible forensic problem. Apart from vague mentioning of topographic highs, the literature contains very little in the way of useful suggestions in a uniformitarian sense. Furthermore, there seems to be a contradiction with this idea. The slumping in Maureen (see later) and the water-escape features in Magnus (see later) point to rapid deposition, possibly as short as a few minutes.
The history of the rock grains. As grains of rock are deposited, they may be compacted by the weight of the overburden. Additionally, the water surrounding individual grains will rise in pressure, and some of the rock grain material will therefore be taken into solution. That material will be re-deposited either elsewhere or back on the same grains in a crystalline form should there be inversion of the formation. (There is plenty of evidence of inversion of oil reservoirs.) The net effect is that the rock grains we now find in a reservoir are not the same, chemically or morphologically, as those at deposition. They may also be clay overgrowths and/ or fluid inclusions, all of which help to unravel the history of the rock and the fluids that were once in the reservoir but are no longer there.
Compaction and oil-emplacement. In some reservoirs, compaction of the rock grains has not been fully achieved, even though such reservoirs are many miles below the surface. This means that the rock grains are not fully supporting the formations above. Part of that support comes from enhanced fluid pressures.
Wilson (2005) has pointed out the oil must have entered many types of reservoirs while the reservoirs were at a shallow depth, at which point there is only partial compaction.4 This causes him a problem, since the oil must leave the source rock5 early in its supposed process of catagenesis (see later). His listed examples include the Ekofisk reservoir (see later), but there is similarity with the Brae and Miller complex listed later. We will return to the topic under the heading of “secondary migration” (see later).
Quartz overgrowths. Much work has been carried out by the oil industry on explaining quartz overgrowths on rock grains within reservoirs. Jourdan et al (1987) have pointed out that the evidence of quartz overgrowths indicates that SiO2 rich fluids were at temperatures of 120–140°C, and the rock was at shallow depth.6
Fluid inclusions and fluid history. One result of the growth of original rock grains is that the growths can trap small quantities of water, gas, and oil. These can be used as diagnostic tools for understanding the fluids that have passed through the reservoir (see Krauskopf and Bird 1995, p. 508 for a general introduction). For a reservoir specific example, see Karlsen et al 2004, from which Fig. 3 was taken.
The cap rock is what is there to prevent the petroleum from escaping to surface. Anything impervious will retain the oil and gas, at least over short periods of time. Mudstone, clays, and evaporites are satisfactory in this sense.
In traditional models of the origin of oil, the cap rock is considered to be in position as an impervious layer before the oil enters the reservoir. Otherwise it will leak. Why then, in many examples, does the cap rock contain hydrocarbons? If we adopt the model that oil is generated in the source rocks, then because the Kimmeridge Clay is the source rock for the South Brae field, then the Clay is both source and cap rock. That, of course, begs the question as to how the oil was ejected downwards against gravity, when we would expect it to be easier to move the oil upwards into the next formation.
Møller-Pedersen and Koestler (1997) have edited a major study on the integrity of cap rocks. Kettel (1997, p. 175) is puzzled why there is twice as much methane in the salt-seal cap rock of a reservoir as in the reservoir. In his view it has to be diffusion, because he is unwilling to countenance the mechanisms that occurred during the Flood.
The gas-chimney over the Ekofisk reservoir is a consequence of fracturing of a whole series of rocks over the reservoir. In summary, something does not quite fit with regard to the conventional ideas about cap rocks, though it does have a close link with Wilson’s (2005) thesis. We will return to the issue later.
The formation waters
All the oil and gas reservoirs contain water. Some of this exists in the oil column, suspended intimately with the oil by capillary forces (Matthews 2004). At the base of the oil column will be an aquifer of additional water (for example, see fig. 2).
There are wide variations between the compositions of formation waters, and these differ dramatically from seawater according to a survey of U. S. fields by Collins (1984). A similar situation prevails in the U. K. North Sea (Fayers, Hawes, and Matthews 1981). Most formation waters are quite saline (typically two or more times the content of NaCl than seawater, but some are almost fully saturated). There is a relative absence of sulfate(SO4) and sometimes a preponderance of barium (Ba) and strontium (Sr) (Warren, Smalley, and Howarth 1994). There is also quite a variation between the formation waters of reservoirs of similar age. In terms of uniformitarian timescales, this is a contradiction that the sedimentation took place in seawater that had had plenty of time to approach near equilibrium.
Examples of reservoirs
We give a few examples of reservoirs from the North Sea. The aim is to show that the problems of the origin of oil are not just about the oil as a fluid, but the origin of the physical structure of the reservoir and all fluids within it. This has already been hinted at in the literature (Matthews et al. 2008). The data will be used to construct a new model of the origin of oil. This particular section is based around reservoirs the author has studied in a commercial environment, but all the data quoted is taken from published sources. A few other reservoirs will be discussed later in the section on secondary migration.
The Maureen Reservoir
The Maureen reservoir is a sandstone reservoir (Cutts 1991) and anticlinal in shape in U. K. block 16/29. The cap rock is a mudstone (see fig. 2). It contains a light oil (type 2 of table 2), with a total volume around 400 million barrels.7 The water is quite salty (twice that of seawater). The reservoir sandstone is assumed to have been deposited as a submarine fan, but the timing of the emplacement of oil in relation to deposition, and central uplift (creating the anticline), is the subject of continuing speculation (Matthews et al. 2008). There are a number of slump features within the reservoir.
Within the main body of the sandstone there are some major volumes of shale. In other places, the sandstone has been cemented by calcite, so that the porosity is destroyed. The chalk, judged to be contemporaneous with that at the Ekofisk reservoir, contains oil, but the permeability there is so low and little of the oil has been extracted. We will return to this intriguing aspect in the discussion about secondary migration.
There is oil beneath the main sandstone and chalk formations in several independent accumulations (Gold’s point 6). However, there is a relatively insignificant amount of oil in the surrounding areas, and the reservoir is not filled to spill-point.
The Wytch Farm Reservoir
The Wytch Farm reservoir is the U. K.’s largest on-land oil field, located in southeast Dorset. Several reservoirs are stacked on top of each other (Gold’s point 6). The oils are all of type 4, but differ significantly within the broad classification of Table 2. A generalized stratigraphy is shown in Fig. 4.
Starting from the bottom, the deep (1600 m) Sherwood Sands (quoted as Permo-Triassic) contained about 750 million barrels of oil. The sands consist of a variable sequence of floodplain deposits, sandflat and lacustrine deposits, sheetflood deposits, channel-fill deposits and aeolian deposits (McKie, Agget, and Hogg 1998). The reservoir is sealed vertically by the Mercia mudstone (fine-grained). A mixture of geological faults and a dipping structure seal the reservoir laterally (see fig. 5).
The Bridport Sands (quoted as Jurassic8—Underhill and Stoneley 1998) contained about 120 million barrels of oil. Those sands are considered to be diachronous. Above the Bridport Sands is the Inferior Oolite. In places the Oolite contains small amounts of oil, but generally it seals the Bridport reservoir with support from the Fuller’s Earth.
A small amount of oil is present in the overlying Frome Clay member.
Apart from relatively small oil fields in the vicinity, nothing the size of Wytch Farm is encountered for around 1,000 km to the northeast (for example, Brae). Further details of Wytch Farm will be discussed in the section on secondary migration.
The South Brae Reservoir
The South Brae reservoir (Turner et al 1987) in U. K. block 16/7 differs from Maureen in several respects. Although sandstone is the porous medium, it is conglomeratic. In conjunction with another paper by Harris and Fowler (1987), a depositional model is provided, but collectively the two papers fail to provide a single concise model of how South Brae came to be. The diagram in Harris and Fowler (1987) shows an attempted paleo-reconstruction during deposition, but the diagram only goes a short way into what is called “the hinterland,” with supposed “energetic streams” supplying the sediment into a subsiding basin.9 The Turner et al. (1987) paper mentions the need to envisage a “relatively rapid waning of coarse-clastic supply to the fan” twice during the deposition of the sediments. Such abrupt cessation does not tie naturally with the Harris-Fowler diagram.
Whilst the oil is also light and has a volume of around one billion barrels, it contains a moderate amount of carbon dioxide (≥ 20 mol %). It is also at a high pressure, which is a puzzle for uniformitarian timescales.10 The water in the reservoir contains moderately large amounts of barium and strontium, which would be unusual if the deposition took place within a normal seawater environment.11 Finally, the whole of the reservoir is surrounded by a shaley material, called the Kimmeridge Clay.
To the east of Brae, the Miller reservoir exists with a carbon dioxide concentration slightly less than than of Brae. A syncline of sandstone provides a hydraulic connection between the two.
The Magnus Reservoir
The Magnus reservoir in U. K. blocks 211/12 and 17 also contains a light oil (type 4 again), and the fluid pressure is high (De’Ath and Schuyleman 1981). In round figures the volume of oil is again one billion barrels.
Between the sand grains there is a large amount of clay. The clay (illite) has a hairy form. There is more clay at the bottom of the reservoir than at the top. Within the sandstone, there are many water-escape pipes, dish structures, and sand injection features.
The Alba Reservoir
The Alba reservoir, in U. K. block 16/26, is sandstone, rather like an elongated pod within an area of mudstone. Sand injection structures exist above the reservoir, and there is evidence of extensive re-mobilisation of the sands (Hurst et al 2003).
The oil is unusual. It consists of a heavy oil (type 7), but the quantities of methane are high. To that extent, Fig. 2 is not strictly relevant. The standard reasoning for the lack of low-weight alkanes is that the oil was light at the time of emplacement, but has been bio-degraded. It may be difficult to sustain that argument on the basis of a young-earth timescale, the reaction kinetics, and the location of the reaction-byproducts.
The Ekofisk Reservoir
The Ekofisk reservoir is a chalk reservoir in the Norwegian block 2/4. It is at high pressure, and the oil is a condensate (type 3). Above the reservoir in the cap rock is a gas-chimney.
The depletion of this reservoir caused the seabed to sink (Zoback and Zinke 2002), because as the hydrocarbons were withdrawn, the fluid pressure fell, and the chalk particles became compacted. The compaction was transmitted back to the seabed.
The Biogenic Model of the Origin of Oil
The biogenic model of the origin of oil (and gas) is the one most commonly held in the West.12 There are eight major stages in the biogenic model of the origin of oil. If any one of the stages can be shown not to have occurred, then the whole model fails the test of sufficiency. It is wrong. Some of the stages are shown in Fig. 6, based on Cornford (1998).
First, the organic material (biological remains of life) must be deposited in large volumes in a matrix of shales and silts. The carbon content is judged to be the most important part. This mixture of organic matter and shales, and/or silts, is called the source rock, though at this stage it does not contain oil. Second, the material must be lightly buried where it can undergo a process of diagenesis (so that only the insoluble kerogen part of the organic matter is left). Section A of Fig. 6 shows the collection and burial of the biomolecules.
Third, the host formation must then be buried to depth. Fourth, the kerogen must undergo catagenesis (changing into molecules of oil). As part of this process, some of the chemical bonds in the kerogen must be broken to form bitumen (Barker 1996, p. 64). These two stages are shown in section B of Fig. 6, though the provenances of the sediments that bury the source rock are not shown.
Fifth, the oil must not dis-associate. Sixth, the oil must be released from the source rock. These two stages are shown in section C of Fig. 6.
Seventh, the oil must migrate long distances to the target reservoir. Eighth, the target reservoir must be capable of accepting and then retaining the oil. These two stages are shown in section D of Fig. 6.
Each of these stages is problematical, and there is often circular reasoning adopted to justify a particular stance. Also, many of the problems are worsened by the need to respect the fact that the earth is young. This is not the place to discuss the age of the earth, though we are getting hints that sedimentary processes are rapid (for example, the energetic streams of Brae, high fluid pressures, and unequilibrated formation waters). The reader is referred to DeYoung (2005) for details about radiometric dating which supports this assertion.
Note that most authors will add a ninth stage, that is, alteration of the hydrocarbons when they are in the reservoir. This is shown as section E. This stage is germane to the origin of the oil in the Alba reservoir (see later).
The problems with the biogenic model of the origin of oil
We start with organic matter in the source rock which has molecular weights in the region of 106, and the need to reduce the bulk of this to values below 1,000, and even as low as 16 (methane). Otherwise, we do not get the alkane distribution shown in Fig. 1. Finally, the molecules of petroleum must find their way into the host reservoir and stay there until recovered by human activity. We list and discuss the individual problems.
Collection of organic matter
The collection of sufficient organic matter within shales and silts is a pre-requisite for the formation of oil to be explained by this model. (The possibility that coal has sometimes acted as a source rock is considered later.) The organic content of ocean sediments, such as in the North Atlantic, is around 0.1% by weight (Hunt 1979). Most other places are less than 1%, except for anaerobic areas such as the Black Sea with values of 6 to 15%. It is only with these last values that, even in the most unprescriptive conditions that have been suggested as part of this biogenic model, enough organic carbon can be found to make useful amounts of an oil-like substance.
There are also restrictions on the type of organic matter which will eventually provide oil. Only the marine planktonic algae have the potential to produce more than a small volume of an oil-like substance (Tissot and Welte 1978, p. 54).13
There are differences in the amount of organic carbon in recent and ancient sediments. The former, as mentioned above, are generally below 0.1%. The ancient sediments have higher levels of organic matter (up to 3%). Furthermore, if we wish to sustain the model that oil is biogenic, the values must have been much higher at deposition, because these sediments are assumed to have yielded up some of their mass to form oil, which subsequently left the sediment.
In conclusion, the present is not the key to the past. Even if all other parts of the biogenic model for the origin of oil can be justified, the model as a whole is not tenable.
The silts and shales containing organic matter are now assumed to have been buried to a shallow depth. Here, in the absence of oxygen, it will undergo a process of diagenesis (Hunt 1979). The reducing conditions will remove oxygen from the organic matter to convert it to kerogen. There are few problems with assuming that this step of the long conversion process did not work, but that is only true for uniformitarian timescales.
Subsequent burial history
A very specific burial history must occur for the kerogen to be heated to the correct temperatures for the correct amount of time to form oil. The completeness of the geological record is a matter of considerable uncertainty (in uniformitarian terms [Barker 1996, p. 91]). Questions about how much sediment was deposited over the source rock, and how much erosion of those sediments took place (which controls the burial history), cannot be answered.
We may summarize this problem by stating that the Davisian cycle of uplift and erosion is not known a priori in basin modelling (Lerche 1990). One of the other problems, that will be amplified later, is that if the burial is too deep, or too long, any oil formed will be destroyed by further thermodynamic processes. However, even those who have been deeply involved with basin modelling (for example, Waples 1998) state that basin modelling
is, in my opinion, characterized more by unfulfilled promises, remaining questions, lingering doubts, and a sceptical base of potential clients than by its successes.
And, of course, some of the “successes” may be accidental. No one is mad enough to use basin modelling to predict where oil is not, and then spend £10 million on a well to prove that basin modelling correctly predicts the absence of oil. So in a “Popper” sense, we cannot easily falsify the model (Popper 1994).
The problem of timing and burial is even more critical for the theory of biogenic oil generation if we insist (quite rightly) on young-earth timescales where much geological history is condensed into a period of perhaps as short as 370 days (by believing that most fossiliferous sediments are the result of Flood geology) or a few thousand years (that some fossiliferous sediments are due to Recolonization geology [Bush 2008]).
Assuming that we have the necessary kerogen at the correct depth, and therefore exposed to the correct temperatures, this now has to be converted to the oil described previously. In the laboratory it is possible to convert kerogen into an oil-like substance. The laboratory process only works provided intermediate reaction products (oxygen, nitrogen, and sulfur) are removed as the process continues.
The problems with assuming that this is what happened underground are:
- We have no idea how nature cooperated in the removal of the intermediate reaction products. If it did not, the reactions could reverse, and we would still have only kerogen. Alternatively, we would expect to find major amounts of nitrogen. The oxygen might be expected to react and form carbon dioxide and water.
- No waxes are generated. Admittedly they are only a small fraction of the components of most oils, but their absence is diagnostic.
- No asphaltenes are generated. Admittedly they are only a small fraction of the components of most oils, but their absence is also diagnostic.
- We have used higher temperatures (300 to 500°C) than expected in the history of the source rock (100 to 200°C). This is excused (but not justified) on the basis that millions of years at a lower temperature will have the same effect on the thermodynamic disassociation of kerogen as a shorter period of time at a higher temperature.14
- The alkane distribution is completely different to that of oil in the reservoir. No alkanes lower than number 15 are generated. No even numbered alkanes are generated. The sheer disparity between what is found in reservoirs and what we have produced is shown in Fig. 7.
In summary, we have managed to generate an unusual set of molecules which have some characteristics of crude oil. However, in comparison with real reservoir oil, the bulk of the hydrocarbons are missing. And they are the ones most useful for human life (heating, plastics, petrol, and diesel). This part of the model, as for other parts, therefore fails the sufficiency test.
Assuming that oil has been produced from organic matter, it now has to leave the source rock. Five mechanisms have been suggested, but each suffers from problems. Hunt (1979, p. 207ff) lists and comments on the first four.
Surfactants. Surfactants15 have been suggested as a way of swelling the oil so that it flows naturally out of the source rock. Explaining where the surfactants came from, and where they went after the oil has left the source rock, simply replaces one problem with another two.16
Migration in water. Migration of oil in solution of water has been suggested. However, the solubilities are low, especially for molecules heavier than methane.
Migration in gas. Migration of oil in the gas phase has been suggested. However, the problem is then explaining why large volumes of oil are found independently of large volumes of gas.
Single phase movement. Oil phase migration as a single phase has also been suggested. However, source rocks have very low permeabilities (Okui, Siebert, and Matsubayashi 1998, p. 46), and the oil does not move in any of the laboratory experiments that have been set up to check this mechanism.
What Okui, Siebert, and Matsubayashi (1998) have found is not unexpected. The author was involved (Matthews et al, 1988) in experimental and mathematical modelling studies to determine how internally generated phase saturations could flow. Even within highly permeable rock, large volumes have first to be created. There would also be large quantities of oil and gas left in the source rocks if this biogenic model were correct.
Migration by diffusion. Migration by diffusion has also been suggested, but Hunt (1979) offers no comments for or against. In a young-earth scenario it certainly would not work when timescales have been reduced by around five orders of magnitude.
Perhaps the fact that these ideas have all hit unmovable barriers suggests that primary migration did not happen, though the Hedberg Conference summary said euphemistically that “migration is inefficient.”
This section on secondary migration will be one of the longest. This is because there is extensive literature on the subject and it has a closer association with Flood geology. When a new oil reservoir is found, apart from asking the engineers how to get the oil out, one of the next questions will be to ask how it got there. If the petroleum geologists can understand the tracks and conduits by which the oil moved from the source rock to the reservoir, they may have a handle on where else oil from those source rocks went, and this in turn gives them a clue as to where to explore for that oil. However, as we shall see, it does not work that way.
At the end of an American Association of Petroleum Geologists conference on secondary migration (1980), the chairmen (Roberts and Cordell 1980) said that there was “honest agnosticism and confessions of ignorance” on how secondary migration occurred. Models had been based on “interpretation of factual observations sponsored and enhanced by imagination.”
One looks for enlightenment in the proceedings of an equivalent conference 10 years later (England and Fleet 1992) and finds nothing except for a reiteration of the problems of 1980. Even after a further 12 years, nothing substantive was offered at a follow-up conference.17 The suite of papers has since been published (Cubitt, England, and Larter 2004), and papers rather steered away from the identifying the conduits and tracks of the supposed migration except by oblique methods. To that extent, the studies have a questionable value.
We will first examine some slightly less general statements about secondary migration to show that it is a worldwide problem. We will then examine some of the reservoirs that have been described above.
- In a desired model of secondary migration, faults appear to be conduits for migration at some times and barriers at others (Barker 1996, p. 384). There is no logic to this, other than to get the petroleum into the reservoir by a secondary migration model, and then keep it there.
- Oil cracking to gas leaves bitumen. Since in west Africa (Barker 1996, p. 288ff) bitumen is found above gas reservoirs, irrespective of where the supposed source rocks were, the lighter gas should be above the heavier bitumen. We do not have that.
- In the North Sea, oil has to penetrate Heather shales in a downward movement to enter the huge Brent reservoir on the basis of the assumed source rocks above the reservoir (Barnard and Bastow 1992, p. 177). The same would be true of many of the other Brent-type reservoirs, such as Statfjord (Morton et al. 1992). We don’t have a mechanism.
- A catalog of other North Sea reservoirs (Alba, Gullfaks, Ekofisk, Frigg, and Fulmar) where, in spite of major commercial activity in the areas, no understanding of secondary migration has been obtained (Matthews 2004).
Reconsideration of Wytch Farm. The quotation by Roberts and Cordell (1980) (“models of secondary migration have been based on interpretation of factual observations sponsored and enhanced by imagination”) can be illustrated by the models of secondary migration suggested for Wytch Farm. The authors emphasise that the explanation is hypothetical, and the number of questions raised by this explanation points to a need for a fundamental rethink along the lines advocated in this paper.
Fig. 5 shows a simplified form of the reservoir cross-section from Underhill and Stoneley (1998) as it is interpreted today. Fig. 8 shows a simplified paleo-reconstruction at the end of the “Cretaceous”. The problem is to explain how oil from the supposed source rock beneath the Bridport Sands in the south moved three miles to the north to enter Bridport and Sherwood sandstones. Furthermore, the sections of these sandstones between faults A and C are not oil-filled.
The mechanism suggested for the filling of the two main sandstone sections of the Wytch Farm oil field are as follows. The details are from Selley and Stoneley (1987):
- In the early Cretaceous (Gault and Chalk are not yet deposited), faulting results in the downthrow of reasonably horizontal strata to the south. (This has been labelled as Fault A.) The fault, which is listric,18 allows the oil in the source rock to rise past the Clays and enter the Bridport Sands to the south of the fault, because near the fault the Bridport Sands are dipping north. Some oil will continue to leak to surface, but there is no explanation as to why petroleum does not enter the Bridport Sands to the north of the fault. Nor do the authors mention the thorny issue of how primary migration occurred.
- Leakage effectively ceased when the overlying Upper Cretaceous deposits were emplaced.
- At this point (late to end Cretaceous) further tectonic activity (a pericline is forming in the south) tilts the southern portions of the Bridport Sands the opposite way (to the south). This allows the petroleum to move north back towards the fault, rise through the fault, and enter the northern portions of the Bridport and Sherwood Sands. This is between Faults A and B on the Figs. 5 and 8.
- The oil continues to move downwards to the north and across another two faults (B and C) by a process labelled “back-filling.”
- Fault C now becomes sealed, though no explanation concerning these crucially timed events is offered.
- In the early Tertiary oil is “lost” in the blocks between faults A and B, and B and C to surface, though this is not really consistent with point number 2.
Selley (2005) came back to the topic of secondary migration later with a comment that in gas-shales: “Because the source rock is also the reservoir, it is not necessary to agonise19 over migration pathways as with conventional petroleum exploration.”
He is clearly uncomfortable with secondary migration and the specific suggestions that he made with Stoneley in his earlier (1987) paper on Wytch Farm. He also voted in my informal survey at the Petroleum Geology Conference in 2003 (see footnote 12 earlier) in support of Gold’s idea that oil is not biogenic.
A further point that strengthens the current argument that secondary migration of the envisaged form does not occur is that if the Underhill and Stoneley (1998) model were correct, then there is good reason to expect other pockets of oil in the area. To quote Underhill and Stoneley (1998), there was “relative disappointment of exploration wells” when extensive exploration took place around the area of Wytch Farm.
Gullfaks. Gullfaks is a giant Norwegian reservoir (over three billion barrels). With such a huge amount of oil that has supposedly migrated from the source rocks, the argument is (if you accept the paradigm that oil is biogenic) there must be other small accumulations of oil in the area. Larter and Horstad (1992) brought together the evidence. The authors briefly show that it is impossible to confirm or identify the movement of oil through the “necessary” conduits between the source rock and the reservoir. However, they claim that they can identify the keyholes that allowed oil to enter the reservoir by geochemical signatures of oil already in the reservoir. This is done on the basis of looking for immature and mature pockets of oil. But the concept of immature and mature oil only arises through the a priori assumption that oil is biogenic. That paper thus proves nothing.
Alwyn. We have briefly referred to the work of Jourdan et al (1987) on quartz overgrowths previously. A later paper by Hogg, Selliers, and Jourdan (1992) provides additional data, specifically on the Alwyn reservoir. There are also a good selection of photographs (some color) and labelled diagrams.
The key points that the authors make is that the overgrowths indicate several different silica-rich pulses of fluids produced the overgrowths. One source of the silica-rich fluids is identified, and fluids are shown to have spread several kilometers to the north and west.20
Smørbukk and Smørbuuk Sør. Smørbukk is another of Norway’s giant hydrocarbon fields. Karlsen produced a poster display on fluid inclusion work at the 2003 conference on Geochemistry and Reservoir Engineering. Earlier studies on the reservoirs had supposedly shown that oil entered Smørbukk from the west, where there is now a sealing fault. On that basis, wells were drilled to the west, because if oil had filled Smørbukk from the west, there ought to be pools of oil still there. No oil was found, but the sand grains showed fluid inclusions (fig. 3). As a session chairman, Karlsen admitted that he had come to the conference hoping for some answers, but was going home with more problems than he had come with.
The paper covering the items in the poster presentation has now been published (Karlsen et al 2004). It is a mammoth tome of over 60 pages. The following points are made:
- The failure of drilling to find the conduits by which oil entered Smørbukk meant that the engineers had to use indirect methods to try and understand how oil entered Smørbukk. Inevitably these were based on geochemistry, and the principle that oil has a biological origin, and therefore shows different levels of maturity.
- On basin modelling, calibration is required to make models correctly predict where oil is found. If temperatures are changed by 20°C, no oil is predicted. (This temperature range is not an unreasonable amount. So the basic level of confidence in basin modelling is low, because the model requires a subjective assumption about temperature.)
- The authors offer no simple explanations as to how oil-filled inclusions occurred. We are reminded that quartz is naturally water-wet21 so the oil does not stick to the grain surfaces. However, if events were rapid, then oil droplets could be trapped during precipitation of the quartz around them. Stokes Law shows that oil droplets of size = 10 μm will not rise rapidly.
- Several levels of oil-filled inclusions are found, suggesting that different types of oil were passing by at the same time as the silica-rich fluids were passing.
- Smørbukk Sør contained a reduced number of inclusions. This supposedly testifies to the later filling (3 million years ago) of Sør from a basin between Smørbukk and Smørbuuk Sør, whereas Smørbukk filled supposedly 50 million years ago.
In summary, we appear to have been presented with a series of facts and a forced interpretation based on an a priori assumption that oil is biogenic.
Troll. The Troll field is a Norwegian gas reservoir. The fields are apparently filled to spill-point, and have a tilted oil-water contact implying active migration (Goldsmith 2000). On the basis of an inferred migration route, a well (31/6-3) was drilled but found no hydrocarbons. This failure to find more reservoirs “acted as a challenge to seek alternative migration routes where “intuition” suggests that there should be a migration path.” That paper concludes with the statement that “Troll may be a unique example of a field that is apparently full to spill, but not spilling” (into other reservoirs). That use of “intuition” failed, because it was based on long timescales. We need the biblical fast-Flood model.
An independent assessment of secondary migration. There are further problems that have since been identified concerning secondary migration. Oil has to enter the target reservoir when the reservoir is at shallow depth (Wilson 2005). To that extent, the origin of oil has to be discussed alongside the question of the origin of the reservoirs. We shall return to this point later.
Although timescales for secondary migration are not a specific problem for those who adopt an old-earth scenario, they are for those who believe that the age of the earth is less than 10,000 years. The issue of timescales applies in several areas. There is the catagenesis, which, even if we accept works at low temperatures (~100°C), does not deliver the oil volume within 10,000 years. No one has demonstrated primary migration, so we cannot put a timescale on that. On secondary migration and the way the oil equilibrates chemically in a typical reservoir, we can put timescales.
In the Danish chalk reservoirs, estimates have been made of how long it took to reach fluid equilibrium after emplacement. Around 2 million years are needed (Vejbæk et al. 2005). Recognizing that we have at most 10,000 years, the migration the authors proposed must be completely wrong. (This analysis is based on supposed fluid flow rates obtained from Darcy’s Law, and is not related in any way to uniformitarian geological timescales.)
A similar problem is present in the Moretti (1998) paper, because she considers that there are millions of years available to charge reservoirs when there are not, otherwise they cannot be filled on the basis of the known hydraulic properties of faults.
“Porphyrins” are present in many oils and the claim is made that they have a similar basic structure to those of chlorophyll from plant material. Krauskopf and Bird (1995, p. 396) state that this is “a piece of chemical evidence that petroleum must be chiefly of organic origin.” But what do these and other authors mean when they declare similarity?
Krauskopf and Bird admit that some of the side chains are missing in the petroleum “porphyrins” and further that the magnesium in the chelate ring (in plant porphyrins) is either absent or replaced by a heavier metal such as vanadium or nickel in the supposed petroleum equivalents. So at a biological level (which is the essential test that determines whether the oil is of organic origin) the two are not similar. Magnesium is a light metal essential to the chemistry of life whereas nickel and vanadium can be poisonous.
Thus, innocuous statements (that there is similarity between the structures of porphyrins from plants and the same substance in oil) are insufficient to show that oil is of organic origin. To clinch the point that the presence of “porphyrins” is not an indicator of an organic origin for the bulk of oil, we note that there are no recorded examples of pure plant porphyrins being found in oil nor of laboratories successfully converting plant-porphyrins into oil-porphyrins. Should these statements ever be successfully challenged, there are still the other seven or so problems with the organic explanation for oil in reservoirs listed above which rule out (on a sufficiency basis) the idea that the bulk of oil has an organic origin.
There are many references to coal being seen as a source rock for oil (for example, Cornford, 1998). As far as the North Sea province is concerned, in the Carboniferous the coal beds are seen as the source of hydrocarbons in the gas fields of the southern North Sea (Besley 1998). In the Brent province, the mid-Ness shale which separates the upper part from the lower part of many reservoirs contains coal sequences (Morton et al 1992).
Undoubtedly, samples of coal could, under controlled laboratory conditions, be turned into a partial set of hydrocarbons. That is a necessary requirement, but not a sufficient condition, to sustain the argument that the bulk of oil is biogenic in origin.
Ultimately, coal can be ruled out as the source rock for the bulk of hydrocarbons in proximity to coal beds on the basis of the problems described above with reference to the supposed clay, shale, and silt layers being source rocks. The geochemistry does not have to be explored in detail when migration is a fundamental problem of getting hydrocarbons out of the source rocks and into the reservoirs.
The other problem with suggesting that coal can be a source rock for oil is the question of the origin of the coal. The secular model is that coal is formed from organic matter in peat swamps over long periods of time. Within a Flood geology paradigm, we simply do not have the years available, but they are not necessary if the coal beds formed within the Flood year from the destruction of pre-Flood vegetation.
Conclusion about biogenic oil
There appear to be too many subjective assumptions regarding the possibility that the bulk of oil is of a biogenic origin. A few percent of certain alkanes may be of a biogenic origin, but it is misleading to say that these are “fingerprints” telling us about the origin of oil. The “fingerprints” are not an integral part of the bulk of oil.
To that extent, we need now to turn to the other secular option advanced for the origin of oil.
The idea that oil does not have a biological origin has been prevalent amongst Soviet block countries for perhaps the last 100 years. The reason is that many of their oil and gas fields are either in metamorphic or igneous rocks, or seemed to have no biogenic source rocks beneath them because the basement rocks were crystalline. The idea has been promoted in the West more recently by Gold (1979, 1987). Two things would have pointed him in this direction.
First, Thomas Gold, along with Fred Hoyle and Herman Bondi, are better known for their work on radar during World War II, and their subsequent studies in astrophysics. They promoted the idea that the universe is self-generating. It is then a short step to suggesting that hydrocarbons are self-generated. They pointed out that there is spectral evidence for hydrocarbons on astronomical bodies.
Second, Gold recognized that volcanoes discharge many complex molecules (Gold, 1979), and because these have no obvious biological origin, they must have been either primordial, or constructed from smaller primordial molecules in a process which he calls abiogenesis. The fact that the geochemistry is not described in detail has made his theory difficult to accept in the West (see for example, Cornford, 1998), but the situation is not that simple, as shown by the summary of the 2005 Hedberg Conference by Katz, Mancini, and Kitchka (2008).
Within the oil industry, some may argue that oil is of biogenic origin. But the fact that we have shown that huge volumes of oil, supposedly the result of biogenic origin, cannot be explained in this way means that an alternative explanation for oil is needed. To that end the abiogenic origin must be considered, even if we do not end up with the details as Gold suggested. As a very minimum, for an abiogenic model to be acceptable, we need to explain the missing alkanes (below C15) which are not formed by biogenesis.
Many of the problems with the biogenic model of the origin of oil do not occur in the abiogenic model:
- We do not have to find large volumes of organic matter, since this is no longer the precursor material.
- We do not need diagenesis.
- We may not need a very specific burial history.
- We do not need the doubtful thermodynamics of catagenesis.
- We do not need to find mechanisms that would release oil from shales.
- We do still need a mechanism for secondary migration (moving oil from the point of its origin to the host reservoir), but Gold and Soter (1982a, b, 1984/1985) suggest that a series of fracturing episodes can perform this operation.
We comment briefly on the points listed in the Introduction above using that numbering system:
- Hydrocarbons are found in the line of arcs which are deep-seated crustal structural features. I am not familiar with any examples, but the evidence points to little or no precursor sedimentary rocks in these areas, so the idea is at least attractive.
- Hydrocarbon areas tend to be rich at many depths. (Examples already quoted include Maureen and Wytch Farm.) This implies a localized source of hydrocarbons with vertical puncturing to allow hydrocarbons to move upwards, but Gold cannot explain the variations in alkane distributions that are seen in vertically stepped accumulations, though natural chromatographic separation during fluid movement through the rocks could play a part.
- Deep hydrocarbons show no biological evidence (for example, optical activity or disparity) between the even and odd numbered alkanes. The hydrocarbon molecules are therefore, in some sense, primordial.
- Methane is found where a biological origin is not probable. The planet Jupiter is believed to be covered by methane, so therefore the origin of that must be primordial. However, the more complex heavier alkanes, waxes, etc. are apparently not present.
- There is no link between the hydrocarbon characteristics across different areas of the world with the geological column. Although the point is a valid one, Gold may be making too much of this, because in his evolutionary mind-set he may be thinking that types of animals and plants varied significantly (thereby controlling the compositions of oil they produced after catagenesis) during geological history.
- There is associated helium in some U. S. reservoirs. Helium is assumed in Gold’s mind to be the next building element after hydrogen in the total collection of the periodic table. What Gold forgets is that since there are no stable elements of (atomic) mass numbers 5 and 8, construction of the elements by this route is not tenable. In particular, therefore, the origin of nitrogen (atomic number 14) in the German reservoirs is unexplained.
Options for explaining abiogenic oil
The Geological Society memoir by Petford and McCaffrey (2003) is one useful source of information on the abiogenic model of the origin of oil. The memoir is principally about hydrocarbons in and around igneous rocks, rather than a detailed discussion of abiogenic hydrocarbons. It is admitted by authors of key papers, such as Potter and Konnerup-Madsen (2003), and Schutter (2003), that some of the hydrocarbons in igneous rocks probably have a biogenic origin. To that extent they are not providing an explanation for the origin of oil at all, because they fail the sufficiency test—their requirement does not fit with the analysis that we have concluded previously. At this part of our study, having rejected biogenic oil, we are therefore relying entirely on an abiogenic process to explain alkanes up to C15 and even-numbered ones thereafter.
Schutter (2003) reviews many reservoirs that are supposed to have hydrocarbons in them that have an abiogenic origin.22 Some of these reservoirs are not of trivial size. He notes one giant reservoir in Java having over one billion barrels of oil in place. Generally there is a “lack of rigorously documented geochemistry” which prevents us from being convinced, even before we get to the detailed reasoning behind the suggestion that abiogenesis is a viable process, that the hydrocarbons are not abiogenic. Specifically he has said, “Many more questions arise than answers exist concerning hydrocarbons in and around igneous rocks”.
Potter and Konnerup-Madsen (2003) review the three common suggestions for explaining hydrocarbons by abiogenesis, though they admit that the true origin remains controversial. There is supplementary information by Schutter (2003). The following are the suggestions:23
- Direct derivation from the mantle;
- Formed by respeciation of the C-O-H system during late crystallization at temperatures below 500°; and
- Synthesis by the Fisher-Tropsch process during post-magmatic alteration processes.
Suggestion 1 allows the hydrocarbons to be primordial (as on Jupiter) or to be continuously produced by a Fisher-Tropsch process in the mantle. The Fisher-Tropsch process is an industrial process used to convert a material with a high carbon content (such as coal) into petroleum liquids in the presence of catalysts such as ferric oxides and/or silicates. A supply of hydrogen is needed, and the suggestion is made that this comes from the splitting of water. The reaction may be written
nCO2 + (2n + 1)H2 → CnH2n + 2 + nH2O
The suggestion is declared as invalid because of the disappointing results from the Siljan Ring well, and is also precluded by the estimated low temperatures and pressures of entrapment of fluid inclusions found. Furthermore, the Fisher-Tropsch process can be controlled in an industrial plant, but in the geology and history of rocks, where there cannot have been such control, it really can only be explained by Roberts and Cordell’s “sponsored . . . enhanced . . . imagination.”
Suggestion 2 can be demonstrated in a ternary diagram (with vertices C, O and H) with specific temperature and pressure histories, but as to whether the history of rocks allowed this to happen to produce the particular distribution of alkanes that we cannot explain biogenically is an open question.
Suggestion 3 is the most favoured in the literature, but in view of the fact that this still requires a geological history that allows the Fisher-Tropsch process to occur, as if it were an industrial process with operators controlling the individual stages of the process, the suggestion remains contentious.
Conclusion about abiogenic oil
There appear to be too many subjective assumptions regarding the possibility that the bulk of oil is of an abiogenic origin. A few percent of certain low numbered alkanes may be of an abiogenic origin, but that is all.
Prompting a Complete Re-think
To summarize so far:
- We have two secular theories for the chemical origin of the hydrocarbons, and the methods by which it may reach reservoirs.
- There are a catalog of problems with the biogenic model, and a catalog of guesswork as to how abiogiesis assembled complex hydrocarbons, waxes, etc.
- Both models involve “geological timescales” of millions of years.
- Reservoir paleo-reconstruction cannot be performed.
- There is no a priori geological history of the reservoir rock to support the geochemical history.
- Guesswork has to be used to explain events surrounding the emplacement of the reservoir cap rock.
- Quiet, long timescales cannot explain the variability of the formation waters.
- We have no uniformitarian explanation for the oil emplacement whilst the reservoirs are at shallow depth.
Therefore, there must exist another explanation.
The two models that have been proposed have been based on an implicit assumption of naturalism. The danger that many people see if a non-naturalist explanation is allowed in science is that there are unattractive philosophical consequences (Johnson 1998, p. 51). Freedom to ignore a creator may be more important to scientists and engineers than to establish the truth about oil and gas.
Johnson’s (1998) essays are about evolution. He puts the unthinkable into words and asks why we are giving answers to questions before asking what the question should be. We have two major theories of the origin of life. In the first, we have a slow evolution of life due to natural selection (Darwin 1859). However, the fossil record does not show slow changes, but rapid and punctuated changes. So there is available an alternative model to the origin of life, namely punctuated equilibrium. At the chemical level (DNA) we cannot explain rapid changes because of the complex inter-linking of genes, and the fact that mutations are generally harmful. As for Darwinism, it does not explain the “fossil record.”
However, the question that is not being asked is “how did life come to be?”. We have been offered an answer that a priori excludes anything other than naturalism. The remaining option is that life was directly created by an intelligent designer. Many have taken that route and accepted that, in view of the problems with Darwinism (and its modern versions) and punctuated equilibria, life was directly created by an intelligent designer. We need to apply this kind of thinking to oil and gas.
The American Association of Petroleum Geologists produces a technical Bulletin which generally contains articles on the geological origin of oil, and trying to trace the source rocks. There is also a monthly magazine (Explorer) which contains oil industry news items and a forum for readers’ letters. In 2005, a series of letters appeared, apparently prompted by a high-profile author criticizing creationism in an earlier article. A number of creationists (they appeared to be old-earth creationists) wrote letters (which were published), and these were interspersed by letters from anti-creationists. From my viewpoint in the U. K., I was encouraged by the dialog, even if I could not subscribe to all that the old-earth creationists were saying. In the U. K., our learned bodies such as The Geological Society forbid any kind of dialogue with creationists (Nield 2008). We are considered to be no better than flat-earthers.
I took the plunge and wrote to the editor, pointing out that there was a fundamental practical point to the discussion which had not been addressed. If the origin of oil could not be explained by biogenesis or abiogenesis, then there was only one option left—creation. That letter was printed (Matthews 2006), but it brought the shutters down on the discussion.
I found a similar conspiracy of silence in the U. K. oil industry. I joined over thirty years ago when I was an old-earth creationist. Within five years I had encountered Whitcomb and Morris’ (1961) book, and after a long gestation period had become a young-earth creationist. The geology I was discovering as a petroleum specialist was bringing me into contact with real geology, as opposed to the sterilized geology in textbooks and journal articles which often deal only with facts that do not compromise naturalism.
There were many occasions when I put forward the view that the earth is young, life is created, and oil is also created. No one ever put any structured counterarguments forward.
A Biblical View to Explaining Hydrocarbons
To summarize, the fact that the two major suggestions for explaining the origin of oil have numerous problems suggests that we have to rationally examine the idea that oil is theobaric (made by God). This suggestion will be examined under scriptural and technical headings. In the process we need to ask where and when God made it. For a moment we consider the geology in the Bible.
There isn’t a lot, but it is crucial and sufficient to develop a third option for explaining the origin of oil. During the Creation Week, God created a mature earth. It remained relatively undisturbed until the Noachian Flood.
The goodness of God in creating a mature earth
The Garden of Eden had everything ready for its first occupants. There must have been mature plants and trees to supply food for immediate consumption. There must also have been partially grown plants which Adam and Eve would have to tend in order to supply food for the days ahead. It would mirror the tree of life described in Revelation 22 which produces a new crop each calendar month. The need for harvesting and storage is then much reduced. In fact, Genesis talks about harvests being a feature of life only while earth remains. We can only talk about these anthropomorphically, and further discussions are not germane to this note.
Life without oil with the population we now have, and cold climates, would be almost impossible, even if we walked everywhere and/or used donkeys to save driving or flying. Consider how we use the components of oil. Methane is the smallest hydrocarbon. It is the main component of natural gas, which we use in our central heating. Ethane, which is number two in the sequence, is used for making the multi-purpose plastics. Propane and butane are next, and are valuable for portable heating because they are almost liquids under normal conditions. The next part of the alkane sequence are the hydrocarbons that make up petrol. Then comes diesel fuel, lubricating oil, and finally the asphaltenes. Each seems to have a purpose in life. Even helium is valuable because of its use for welding, and as an additive for compressed-air diving. My thoughts are that God, in His bounty, made hydrocarbons to meet our specific needs.
Although the molecules that make up the hydrocarbons are complex,24 their complexity is miniscule compared with that of molecules (such as DNA) within living matter. So God would have no difficulty (I speak anthropomorphically to avoid arguments that I am invoking God of the Gaps) in making hydrocarbons. It also fits in with ideas expressed in Isaiah’s Song of the Vineyard (chapter 5). God is seen as someone who prepared the earth fully for man’s habitation. The hydrocarbons are useful, not only as a fuel, but for their ability (through changing the carbon bonds around in the refinery) to be transformed into other conveniences of modern life, such as the plastics.
Biblical evidence for God creating oil
Some kind of oil derivative was used by Noah to waterproof the Ark. We also have to recognize that, in the pre-Flood landscape (although we do not have detailed descriptions in the book of Genesis), we do know that a wide range of minerals were available for human use. We read of gold, onyx, soil,25 building materials (for cities),26 bronze and iron. The wide range of vegetation and the number of animal kinds also point to God who was liberal with his creative activity. So that although oil is not something simple (see earlier), the idea of God directly creating oil is not unreasonable when compared with other aspects of the young-earth creationist model.
On thoughts about other minerals
Although my ascribing the origin of oil to the direct creation of God is something new, the idea that minerals were already present on the earth (and oil is one of many minerals) as part of the rich diversity in creation has been made before, and therefore strengthens the case I am making. Jones (1998), considering the way science is taught, points out that there is no way in which science is neutral about origins. Whilst the following quote was written about cells, I consider that it is appropriate to oil. He says (Jones 1998, p. 103): “each design is special, and has that unique combination of features and properties that fit it for specific roles and relationships in God’s world.”
We turn our attention now to how the reservoirs where we now find oil are related to earth’s history, especially in the Flood.
Completing the geological story with reference to the Flood
In a young-earth framework, the oil reservoirs that we now find were either deposited during the Noachian Flood (Flood geology for short) or formed after the Flood (Recolonization geology). Either way, the oil that we now have access to was either:
- created after the Flood;
- or lain relatively undisturbed during the tectonic activity of the Flood (since then it has been released from wherever it was placed by God during the Creation Week and now entered the reservoirs that we now have);
- or was placed in deeper locations during Creation Week, and moved by standard hydraulic means into the target reservoirs during the Flood (Flood geology) whilst the “fountains of the great deep” were open.
Oil created after the Flood
It would seem unusual for God to have created oil after the Flood. Whilst the Bible contains many examples of God actively creating new healthy limbs (for example, in some of the miracles of the New Testament) after the Creation Week, and oil (though surely comparable to a plant derivative rather than what we get out of the ground) for the Shunammite woman, that level of creativity is miniscule to what God did during the Creation Week. It would therefore seem more likely that God created oil during the Creation Week.
There is a technical issue that seems to confirm God creating oil in the Creation Week. Oil in known reservoirs seems to have entered from deeper positions in the earth (Wilson 2005). We will examine the details later.
Oil moving into target reservoirs after the Flood
In the Recolonization model of geology (Bush 2008), the bulk of the fossiliferous sediments are assumed to have been deposited after the Flood. For the fossiliferous sediments to have filled with oil only after the Flood, we have to accept that for all the tectonic activity during the Flood, oil was not released from the repositories that God placed it in during the Creation Week. Since during the Flood the “fountains of the great deep” burst forth, the oil repositories must have been deeper so that the oil remained undisturbed. How the oil could then have been released from these even deeper repositories becomes a matter of unreasonable speculation. The “fountains of the great deep” were “closed,” yet as oil would have to pass these “shallower” positions during migration, it seems unreasonable to expect that the intense tectonic activity associated with the release of the oil would not also have breached the “fountains of the great deep.”
In addition, there are severe problems with the recolonization model of geology which we will briefly list. Some of them are general issues, but some are specifically derived from the information supplied in this document. They are:
- The timescale needed for animal recolonization of the world, and their subsequent fossilization, requires an unacceptable stretching of biblical dating.
- There is often no provenance for the sediments. The Davisian cycle does not work (see previously).
- The enormity of geological events during recolonization. As an example, consider the dry valleys in what is commonly called Tertiary times compared with the paucity of evidence of rapid run-off of Flood water somewhere lower in the rock sequence.
- The fact that during the Flood the “fountains of the great deep” were closed, so no new deep water has since been delivered to the surface of the earth. To that extent we would expect a high degree of similarity between the salinity of the sea at the end of the Flood and that of the present day. The variability of the formation waters in reservoirs of many ages shows that that post-Flood emplacement of oil is not a convincing model.
Oil moving into target reservoirs during the Flood
The most likely event that placed oil in the target reservoirs is the Flood. There are biblical and scientific reasons for this interpretation.
We have suggested that oil was created by God in the beginning. What we have not discussed is the question where God put that oil. Noah had access to some of this oil,27 but that is all we know.
The known evidence could be explained by suggesting that God created oil in deep primordial repositories during the Creation Week, and that it migrated upwards into present-day reservoirs during the Noachian Flood.28 Since the secular ideas on migration of oil are not viable (discussed previously), we need a new explanation for this vital part of the process.
A new model of hydrocarbon emplacement
Whichever Flood model one adopts, intense geological activity will have occurred whilst the “fountains of the great deep” described in Genesis were active, though after day 150 of the Flood God said that the fountains were closed, so we would expect a sharp cut-off in hydraulic activity. During the Flood, the primordial repositories containing the hydrocarbons will have been breached and fluids released. Provided that the sedimentation was rapid, both in respect to the porous rocks and the cap rock, then most of the hydrocarbons could be trapped at shallower depths than the primordial repositories. If sideways sedimentation occurred, then the trapping of oil by the process discovered by Berthault (1986) would have been even more effective, because cap rock and reservoir rock would have been deposited at the same time.29 Whatever the true events, the new hydrocarbon emplacement model favors the short timescale associated with the 150-day period when the “fountains of the great deep” were active, rather than the post-Flood strata model where sedimentation takes place over many subsequent years.
The author is not precluding the formation of oil reservoirs after day 150, since after day 150, in order to drain large tracts of land ready for rehabitation, significant tectonic events will have had to take place. We observe oil seeps (for example, see fig. 5) today when tectonic activity is limited. Some reservoir rocks will therefore have been deposited as a result of a Davisian type of sedimentation (though on timescales unbelievably short for Davis) and the hydrocarbons would have been released from lower temporary positions. Paleo-oil is one example of this. Even more significant are the blowout pipes being observed as a result of improved seismic surveys, as will be discussed.
Illustrating the model-synchronous geo-events
Cause and effect is not always unravelled in geology. One exception is synsedimentary faulting. Faulting, if it takes place in a watery environment, will give rise to sedimentary activity. Material may be eroded from the footwall of a normal fault, and deposited in the basin created by the hanging wall. Another example of a synchronous geo-event is when tectonic activity results in abnormal oil seeps at the surface. This is common in the fault zones on the western seaboard of the USA (Sibson 1990). These separate cause and effects may be illustrated by Fig. 9.
What is not considered is whether all the three events are synchronous. The reality has to be that a single tectonic event could have the links shown in Fig. 10.
Finally, if we reduce conventional timescales by 6 to 10 orders of magnitude, then the sedimentation is potentially fast enough to entrap the released oil. We can then complete the diagram as Fig. 11.
In this scenario, oil will also have the potential for release into the environment. If the reservoir cap material is deposited in a matter of hours after the reservoir sediments, then the loss will be small, and some of the escaping oil will be entrained in the cap rock (as in the Kimmeridge Clay). Sideways sedimentation, as suggested by Berthault (1986), would be an even more effective means of trapping oil.
Explaining individual reservoir phenomena
We briefly recap on the list of reservoirs described so far. The aim is to see how what we know about them fits in with the idea that theobaric oil moved into the reservoirs during short, though sometimes localized, bursts of sedimentary activity during the Noachian Flood.
Cap rock hydrocarbons
—Maureen, Brae, and Wytch Farm
Hydrocarbons within the cap rock (shales and saltseals) are a consequence, not of local generation of the hydrocarbons or of diffusion (there is not enough time), but of hydrocarbons being intimately mixed with the cap-rock material while those materials are being deposited, and before they are sufficiently compacted to be impermeable. This explains the situation in Maureen, Brae and Wytch Farm regarding oil in “cap rocks.”
Explaining capillary behavior
Capillary behavior30 within the reservoir and the distribution of illite in the Magnus reservoir is explained (see Matthews 2004).
Explaining high pressures
—Brae, Magnus, and Ekofisk
The high pressure of the Brae reservoir is now explained. Sedimentation of the conglomerates (200 to 500 meters of it) must have taken place within a matter of minutes to an hour or so. The source of the “cap rock” is already active (those sediments are inter-digitating with the Brae conglomerates). That sudden cessation of reservoir sediment31 simply allows the deposition of the Kimmeridge Clay to continue, trap some of the oil, and finally seal the Brae reservoir. Such abrupt cessation of the conglomerate sediment supply does not tie naturally with the diagram in Harris and Fowler (1987).
The Ekofisk and Magnus reservoirs support this same interpretation. In Alba, the pressures are “normal,” but this is due to extensive remobilization of the sands which have penetrated the “cap rock,” thus releasing any original over-pressure. But the oil was already in the reservoir.
While geological features such as kimberlite pipes have been mined below the level of the Precambrian basement (Holmes 1979),32 we now have a greater understanding of the earth’s structure because of improvements in seismic capability. For example, Cartwright (2007) shows examples of what he calls “blowout pipes” within the North Sea. Later he quotes diameters of 100 m to 3 km, and heights up to 2.5 km.
These pipes are potentially the answer to Hogg, Selliers, and Jourdan’s (1992) question about the origin of hot acidic waters during deposition of the reservoir facies for Alwyn and Smørbukk that give rise to the fluid inclusions. They could be the conduits used by the “fountains of the great deep,” but if any over-pressured formations remained at the end of day 150 (when the “fountains of the great deep” closed) they may have had a less-catastrophic origin due to de-watering.
Dealing with Objections
Theological and physical objections have been raised against this theory that oil is “theobaric.” This section deals briefly with four key ones. Readers are welcome to contact the author for more details, or discuss their own points.
Mention the word “God” in a science paper, and it is not likely to be printed. Gould (1999) came up with this idea of science and religion having their individual magisteria. Science and religion cannot be mixed. But the truth is that most people who object to the Bible do so, not on intellectual grounds, but because of its call to be obedient to the ways of God (Lennox 2007). Furthermore, Jesus never seemed to divide life into the secular and the sacred. This view is sustained in Romans 1:20, where we are reminded that God’s invisible nature can be understood through what He has created.
Objections from old-earth creationists
Disappointingly, some Christians fail to offer a consistent reason for their line of thinking, because young-earth creationism may be seen as going back to “the God of the gaps.” The issue has been addressed by Weinberger (2008), who argues that as long as the science is consistent with the Bible, then we should not worry about offering an explanation for phenomenon that science has no explanation for. After all, God does not try to prove His existence. He simply tells us that He is there. The science and the theology now form an impregnable position on the origin of oil.
Objections from some young-earth creationists
There has been much discussion within young-earth creationist circles about Whitcomb and Morris’ (1961) thesis that the bulk of the fossiliferous geological strata are the result of the Flood. Theological objections have been raised against this point of view, with claims by Recolonization geologists that God would have surely destroyed everything so completely during the Flood that no evidence of it would remain. In answer to this objection there are several points:
- Fish survived outside the Ark during the Flood. Why not other things?
- Seeds and tree branches survived the Flood (to propagate the olive tree). So why not other things?
- God teaches us through recordable and observable events in the physical world. (Jesus, according to Luke, began to “do and teach.” Note the order!) If the Flood left no trace (so that the fossiliferous strata are post-Flood), then the biggest geological event after Creation breaks this pattern.
In terms of the science, we have shown that oil reservoirs must have been deposited and filled during the Flood. Since, using uniformitarian terminology, reservoirs vary in age from Carboniferous to Tertiary, these strata and the ones in between must be Flood deposits, although it would be risky without further work trying to find boundaries for the pre-Flood landscape, day 40 (when the mabbul ceases), or day 150 (when the “fountains of the great deep” close), on the basis of material in this paper.
There are occasions when fossils (including marine life) are reported to have an oily smell. The claim is made that this supports the biogenic origin of oil, and may be inconsistent with the model described above.
The human nose can identify a small number of individual smells, but not with sufficient precision to identify the alkane 15 (which could have come from a biogenic oil) from the alkane 14, which cannot be explained (yet) by biogenic methods.
Technical objection—environmental loss
If the oil entered the reservoirs whilst sedimentation was proceeding, perfectly impervious cap rocks could not have been present to ensure that no oil was lost to the environment. Just as today, seeps of oil occurred, so some loss of oil to the environment would have occurred during emplacement. In the case of certain petroleum reservoirs, there appears to have been more petroleum in the cap rocks than in the reservoirs. Three mechanisms would have served to reduce the losses. First, there may have been a limited volume of oil released, governed by the physical size of the primordial repository. Second, the oil would have been migrating upwards into a rain of sediment downwards. This would have slowed the oil’s ascent to Darcy flow rates. Third, the cap rocks could have arrived like a focal-plane shutter on a camera.
Theological objection—environmental loss
Why, if God created the oil and then it moved during the Flood, did He allow so much waste of oil in the cap rocks that we cannot access? We could as easily ask why God made so many galaxies. They have no effect on life now. Yet isn’t the oil to remind us that the Flood was real?
Summary and Conclusions
- The biogenic process that supposedly converted organic matter into the full suites of oils and gases is a seriously deficient idea.
- The abiogenic route has some merits, but is ill-defined in terms of its geochemistry and secondary migration. Its main support comes from those who see problems with biogenic oil, but are not willing to accept any form of metaphysical origin of oil.
- Neither of the two models provides a geological explanation as to how oil and gas entered reservoirs whilst they were still at shallow depth, and how the hydrocarbons were subsequently retained.
- We are therefore left with the distinct possibility that oil and gas were made by God in the Creation Week, and that they moved into their present positions during the biblical Flood.
- Scientific and theological reasons have been provided to substantiate this thesis.
- The conclusions about the origin of oil confirm that the bulk of the fossiliferous geological strata are Flood deposits.
- This means we have some potential powerful Christian apologetics.
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