There's been a lot of talk lately about "peak oil" – the idea that we have passed the mid-point in our insatiable quest to rape the Earth of her oil. Having extracted the easy half of the world's oil reserves, getting at the rest will be ever more difficult and expensive. The price of oil will inexorably rise, leading to the collapse of western civilization and forcing the starving and emaciated survivors to survive on a diet of boiled SUV seat leather. Or something.
The above scenario, endorsed with virtual unanimity by all of the professional petroleum geologists employed by the large oil companies, is based on the uncontroversial theory that oil is biogenic; that is, that oil and coal and natural gas are created by a process of heating and cooking of biological material (dead dinosaurs and focuses from previous geological epochs) in the upper layers of the Earth's crust. Given that there is only so much dead T. Rex to go around, there is an inherent and relatively small amount of these fossil fuels to be had.
However, there is another theory. There are some (largely Ukrainians and British astrophysicists) who believe that petroleum is the result of abiogenic processes. Which is to say that oil does not come from T. Rex and the clever velociraptors, but rather from non-biological processes acting on hydrocarbons that were present in the Earth (in stupendous quantities) from the time of the Earth's formation.
The oil company petrochemical experts say bunk to this, and point to the fact that there are biological materials found in oil and coal. That is, in fact, why we call them "fossil fuels." How do you explain that, Mr. Smarty-pants?
Well one of the Smarty-pants on the abiogenic side of the debate is the now deceased Thomas Gold. Gold, originally from Austria, spent most of his lengthy scientific career in Britain, where he worked with Fred Hoyle as one of the proponents of the Steady State theory of cosmology. Now thought to be wrong, no one ever believed that it was stupid – and the contest between the two theories greatly enhanced our understanding of the cosmos. But Gold was right about an uncanny number of things. When the first pulsars were detected, Gold was the first to realize that they must be rapidly rotating neutron stars. Neutron stars had first been theorized in the thirties, but no one had ever detected one. Gold was laughed at, and then proved right.
Gold oversaw the construction of the world's largest radio telescope at Arecibo. When radio sources were first seen through Arecibo, astronomers thought at first that they were merely unusual stars. From the 1950's, Gold insisted that they were galaxies. Again after a long dispute, he was proven right. Starting in the seventies, Gold began looking at the problem of petroleum. He published a controversial paper in 1993 on the The Origin of Methane (and Oil) in the Crust of the Earth. His efforts culminated in the 1999 publication of the book, The Deep Hot Biosphere.
Gold maintains that there is another biosphere, one of bacteria living deep in the earth and feeding on heat and oil found in the depths. The total mass of biological material under the earth would be many, many times greater than of all the life on the surface or the oceans. And as the oil, natural gas and other petroleum seeps up from below through fissures along the fault lines of the Earth's crust, it is fed upon by these bacteria – which are where some of the biological markers found in oil come from. As it gets closer to the surface, it collects in reservoirs. Sedimentary rock form particularly good ones, because of the porous structure of the rock. And that is where the fossils come from. But oil has not only been found in sedimentary rock. And human skulls have been found in coal deposits in Pennsylvania. Gold's theory has coal formation a result of petroleum saturating fossil biological material and "freezing." The age of the substrate is irrelevant – the oil comes from below.
There are several key arguments for the abiogenic theory for the origin of petroleum:
The basics:
- The constituent precursors of petroleum (mainly methane) are commonplace in the solar system and it is likely that they were part of the Earth's makeup from the start, and that appropriate conditions (heat and pressure) exist for hydrocarbons to be formed deep within the Earth. Carbonaceous chondrite meteorites have been found to contain kerogen-like carbon and hydrocarbons, similar to the precursors for the oil we drill. Heated under pressure, this material would release hydrocarbon fluids in addition to creating solid carbon deposits. Further, at least ten bodies in our solar system are known to contain at least traces of hydrocarbons. Kerogen-like material has been detected in interstellar clouds and in dust particles around stars.
Dr. Gold, from this excellent article:
Astronomers have been able to find that hydrocarbons, as oil, gas and coal are called, occur on many other planetary bodies. They are a common substance in the universe. You find it in the kind of gas clouds that made systems like our solar system. You find large quantities of hydrocarbons in them. Is it reasonable to think that our little Earth, one of the planets, contains oil and gas for reasons that are all its own and that these other bodies have it because it was built into them when they were born? That question makes a lot of sense. After all, they didn’t have dinosaurs and ferns on Jupiter to produce oil and gas?
- Also, it is now accepted that the formation of the Earth was a "cold" process – a process of accretion that didn't heat up until radioactive materials began to sink to the center under the heat and pressure from the cold surface. This process would not have resulted in outgassing of hydrocarbons and methane from the surface as it would have if the surface had been all molten rock. (That surface likely would have done away with all the water, too.)
- The Second Law of Thermodynamics prohibits spontaneous generation of hydrocarbons heavier than methane at low pressures. Thermodynamic calculations and experimental studies confirm that n-alkanes (common petroleum components) do not spontaneously evolve from methane at pressures typically found in sedimentary basins. There simply isn't enough crushing and squeezing energy at these relatively low depths. The materials we find in petroleum would require far greater pressures – those found below 200 km.
- Hydrocarbon deposits have been found in places that are said to be poorly explained by biogenic theory. In the White Tiger field in Vietnam and many wells in Russia, oil and natural gas are being produced from reservoirs in granite basement rock, below all sedimentary rock. In the Vietnamese case, this rock is believed to have no oil-producing sediments under it, so the biogenic theory requires the oil to have migrated laterally dozens of kilometers along faults from source rock. Experiments in Sweden, deep drilling over five kilometers into shield rock has also revealed oil, and microbes. These microbes live on the hydrocarbons.
- Petroleum deposits are often found close to deep structures in the earth – subduction zones, plate boundaries, and the like. They also are found over meteorite impact structures. In short, the places where faults can reach to the Earth's mantle, and release the primordial crude. Oil is often found in sedimentary basins because sedimentary basins fill and cover – cap – depressions over the deep structures. Sedimentary rocks make good reservoirs that allow hydrocarbons to pool, but prevent them from migrating further upward. (Petroleum also occurs in crystalline basement strata, but most petroleum companies prefer to drill sedimentary basins, either because they are looking for large reservoirs or because they hold with the idea that petroleum would only be formed there from organic debris.)
- Some oil fields are being refilled from deep sources, although this does not rule out a deep biogenic source rock. One instance is Eugene Island in the Gulf of Mexico which "began producing about 15,000 barrels of oil per day in the early 1970s. By 1989, the flow had dwindled to 4,000 barrels per day. Then, suddenly, production zoomed to 13,000 barrels. In addition, estimated reserves rocketed from 60 to 400 million barrels." The age of the oil recovered now is reportedly greatly different from that of only ten years ago.
"The Middle East has more than doubled its reserves in the past 20 years, despite half a century of intense exploitation and relatively few new discoveries. It would take a pretty big pile of dead dinosaurs and prehistoric plants to account for the estimated 660 billion barrels of oil in the region, notes Norman Hyne, a professor at the University of Tulsa in Oklahoma." Off the-wall theories often turn out to be right," he says."
Gold said, in a Wired interview,
It becomes accessible by recharging, and the recharging process I think I completely understand. There's a stepwise approximation of the pore pressure to the rock pressure - that will always be the case if the stuff is coming up from below. You will not just fill up one reservoir at the top in the shallow levels. It will always be underlaid by another reservoir, and that in turn by another, and so on for a long way down.
Circumstantial evidence:
- Tiny diamondoids occur in oils and condensates. They have similar structure to regular diamonds, and would probably have the same origin - earth's mantle.
- Helium gas has close association with petroleum. Although some He is primordial, much He gas is from radioactive decay of uranium. Helium gas is associated with light oils, sometimes accompanied by nitrogen that allow petroleum to reach shallow levels in crust. No conceivable biological process would result in helium, a noble gas which plays no part whatsoever in organic chemistry.
- Nickel (Ni),vanadium (V),lead (Pb),arsenic (As),cadmium (Cd),mercury (Hg) and others metals frequently occur in oils. Some heavy crude oils, such as Venezuelan heavy crude have up to 45% in vanadium pentoxide in their ash, high enough that it is a commercial souce for vanadium. These metals are common in earth´s mantle.
- Russian geologist Nikolai Alexandrovitch Kudryavtsev first enunciated the modern abiotic theory of petroleum. He studied the Athabasca Tar Sands in Alberta, Canada and concluded that no "source rocks" could possibly have formed the enormous volume of hydrocarbons. (Source rocks being sedimentary deposits with requisite quantities of dead dinosaurs.) Therefore, abiotic deep petroleum is the only plausible explanation.
J.F. Kenney of Gas Resources Corp. in Houston said there is no real debate about petroleum origination.
There has not been any 'debate' about the origin of hydrocarbons for over a century," he stated. "Competent physicists, chemists, chemical engineers and men knowledgeable of thermodynamics have known that natural petroleum does not evolve from biological material since the last quarter of the 19th century.
Gold Said:
We have two conflicting pieces of evidence. Petroleum contains helium, which the plants cannot have concentrated," he said. "Petroleum also contains purely biological molecules, which petroleum-fed biology deep in the ground could concentrate.
This (upward migration from great depth) is the only explanation I've ever heard of to account for the amount of helium brought up with petroleum.
Gold believes that the amount of oil is hundreds of times greater than the estimates produced by the oil industry's scientists. The Russians are already acting on the theory, and now have many wells producing oil where no western petrochemical engineer would believe it should be. If abiogenic oil exists in the quantities imagined by Gold and the Ukrainians, much of our energy worries are grossly exaggerated. And given the scarcity-driven price of oil, criminally exaggerated.