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First to weigh in was Nature (Tom Clarke “Fossil Fuels Without the Fossils: Petroleum: Animal, Vegetable or Mineral?,” Nature News Service, August 14, 2002).
Petroleum – the archetypal fossil fuel – couldn’t have formed from the remains of dead animals and plants, claim US and Russian researchers. They argue that petroleum originated from minerals at extreme temperatures and pressures.
Other geochemists say that the work resurrects a scientific debate that is almost a fossil itself, and criticize the team’s conclusions.
The team, led by J.F. Kenney of the Gas Resources Corporation in Houston, Texas, mimicked conditions more than 100 kilometres below the earth’s surface by heating marble, iron oxide and water to around 1500° C and 50,000 times atmospheric pressure.
They produced traces of methane, the main constituent of natural gas, and octane, the hydrocarbon molecule that makes petrol. A mathematical model of the process suggests that, apart from methane, none of the ingredients of petroleum could form at depths less than 100 kilometres.
The geochemist community, and the petroleum industry, were both suitably outraged by the publication of the study. The usual parade of experts was trotted out, of course, but a funny thing happened: as much as they obviously wanted to, those experts were unable to deny the validity of the research. So they resorted to a very unusual tactic: they reluctantly acknowledged that oil can indeed be created from minerals, but they insisted that that inconvenient fact really has nothing to do with the oil that we use.
Showing that oil can also form without a biological origin does not disprove [the ‘fossil fuel’] hypothesis. “It doesn’t discredit anything,” said a geochemist who asked not to be named.
… “No one disputes that hydrocarbons can form this way,” says Mark McCaffrey, a geochemist with Oil Tracers LLC, a petroleum-prospecting consultancy in Dallas, Texas. A tiny percentage of natural oil deposits are known to be non-biological, but this doesn’t mean that petrol isn’t a fossil fuel, he says.
“I don’t know anyone in the petroleum community who really takes this prospect seriously,” says Walter Michaelis, a geochemist at the University of Hamburg in Germany.
So I guess the geochemist community is a petulant lot. They did “concede,” however, that oil “that forms inorganically at the high temperatures and massive pressures close to the Earth’s mantle layer could be forced upwards towards the surface by water, which is denser than oil. It can then be trapped by sedimentary rocks that are impermeable to oil.”
What they were acknowledging, lest anyone misunderstand, is that the oil that we pump out of reservoirs near the surface of the earth, and the oil that is spontaneously and continuously generated deep within the earth, could very well be the same oil. But even so, they insist, that is certainly no reason to abandon, or even question, our perfectly ridiculous ‘fossil fuel’ theory.
Coverage by New Scientist of the ‘controversial’ journal publication largely mirrored the coverage by Nature (Jeff Hecht “You Can Squeeze Oil Out of a Stone,” New Scientist, August 17, 2002).
Oil doesn’t come from dead plants and animals, but from plain old rock, a controversial new study claims.
The heat and pressure a hundred kilometres underground produces hydrocarbons from inorganic carbon and water, says J.F. Kenney, who runs the Gas Resources Corporation, an oil exploration firm in Houston. He and three Russian colleagues believe all our oil is made this way, and untapped supplies are there for the taking.
Petroleum geologists already accept that some oil forms like this. “Nobody ever argued that there are no inorganic sources,” says Mike Lewan of the US Geological Survey. But they take strong issue with Kenney’s claim that petroleum can’t form from organic matter in shallow rocks.
Geotimes chimed in as well, quoting Scott Imbus, an organic geochemist for Chevron Texaco Corp., who explained that the Kenney research is “an excellent and rigorous treatment of the theoretical and experimental aspects for abiotic hydrocarbon formation deep in the Earth. Unfortunately, it has little or nothing to do with the origins of commercial fossil fuel deposits.”
What we have here, quite clearly, is a situation wherein the West’s leading geochemists (read: shills for the petroleum industry) cannot impugn the validity of Kenney’s unassailable mathematical model, and so they have, remarkably enough, adopted the unusual strategy of claiming that there is actually more than one way to produce oil. It can be created under extremely high temperatures and pressures, or it can be created under relatively low temperatures and pressures. It can be created organically, or it can be created inorganically. It can be created deep within the Earth, or it can be created near the surface of the Earth. You can make it with some rocks. Or you can make it in a box. You can make it here or there. You can make it anywhere.
While obviously an absurdly desperate attempt to salvage the ‘fossil fuel’ theory, the arguments being offered by the geochemist community actually serve to further undermine the notion that oil is an irreplaceable ‘fossil fuel.’ For if we are now to believe that petroleum can be created under a wide range of conditions (a temperature range, for example, of 75° C to 1500° C), does that not cast serious doubt on the claim that conditions favored the creation of oil just “one time in the earth’s 4.5 billion year history”?
A more accurate review of Kenney’s work appeared in The Economist (“The Argument Needs Oiling,” The Economist, August 15, 2002).
Millions of years ago, tiny animals and plants died. They settled at the bottom of the oceans. Over time, they were crushed beneath layers of sediment that built up above them and eventually turned into rock. The organic matter, now trapped hundreds of metres below the surface, started to change. Under the action of gentle heat and pressure, and in the absence of air, the biological debris turned into oil and gas. Or so the story goes.
In 1951, however, a group of Soviet scientists led by Nikolai Kudryavtsev claimed that this theory of oil production was fiction. They suggested that hydrocarbons, the principal molecular constituents of oil, are generated deep within the earth from inorganic materials. Few people outside Russia listened. But one who did was J. F. Kenney, an American who today works for the Russian Academy of Sciences and is also chief executive of Gas Resources Corporation in Houston, Texas. He says it is nonsense to believe that oil derives from “squashed fish and putrefied cabbages.” This is a brave claim to make when the overwhelming majority of petroleum geologists subscribe to the biological theory of origin. But Dr Kenney has evidence to support his argument.
In this week’s Proceedings of the National Academy of Sciences, he claims to establish that it is energetically impossible for alkanes, one of the main types of hydrocarbon molecule in crude oil, to evolve from biological precursors at the depths where reservoirs have typically been found and plundered. He has developed a mathematical model incorporating quantum mechanics, statistics and thermodynamics which predicts the behaviour of a hydrocarbon system. The complex mixture of straight-chain and branched alkane molecules found in crude oil could, according to his calculations, have come into existence only at extremely high temperatures and pressures—far higher than those found in the earth’s crust, where the orthodox theory claims they are formed.
To back up this idea, he has shown that a cocktail of alkanes (methane, hexane, octane and so on) similar to that in natural oil is produced when a mixture of calcium carbonate, water and iron oxide is heated to 1,500° C and crushed with the weight of 50,000 atmospheres. This experiment reproduces the conditions in the earth’s upper mantle, 100 km below the surface, and so suggests that oil could be produced there from completely inorganic sources.
Kenney’s theories, when discussed at all, are universally described as “new,” “radical,” and “controversial.” In truth, however, Kenney’s ideas are not new, nor original, nor radical. Though no one other than Kenney himself seems to want to talk about it, the arguments that he presented in the PNAS study are really just the tip of a very large iceberg of suppressed scientific research.
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