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Hydrocarbons can form without living organisms, but that does not show that commercial oil fields—or most of the petroleum we use—come from those reactions. A 2009 laboratory experiment produced several hydrocarbons from methane under extreme pressure and temperature. It demonstrated a possible chemical pathway, not the formation or replenishment of oil deposits at commercial scale.
What does “fossil fuels without the fossils” mean?
It refers to the idea that some hydrocarbons may form through non-biological chemical reactions inside Earth, rather than from ancient organic matter. This is called abiogenic formation. The phrase can blur two very different claims: that abiogenic hydrocarbons can form, and that this process accounts for a major share of commercial petroleum. Evidence supports the first; the cited studies do not establish the second.
What did the 2009 experiment demonstrate?
In a paper published in Nature Geoscience on 26 July 2009, Anton Kolesnikov, Vladimir G. Kutcherov, and Alexander F. Goncharov used laser-heated diamond-anvil cells and Raman spectroscopy to study methane under conditions associated with the upper mantle. Above 2 GPa and at 1,000–1,500 K, some methane reacted to form ethane, propane, and butane, as well as molecular hydrogen and graphite. Ethane subjected to similar conditions produced methane, indicating that the reaction could also proceed in reverse. Read the paper in Nature Geoscience.
Those pressure and temperature values describe the laboratory conditions; they are not estimates of petroleum resources or evidence of commercial accumulation. The experiment showed that these molecules can form under the tested conditions. It did not measure how much hydrocarbons Earth naturally produces this way, whether they migrate into crustal reservoirs, or whether enough could accumulate to be commercially recoverable.
What does geological evidence show?
Abiogenic methane and higher hydrocarbons have been reported in crystalline rocks, including in research on the Canadian Shield. Isotope analyses can help distinguish abiogenic hydrocarbons from those formed through biological processes. These observations establish that abiogenic hydrocarbons occur in nature, but they do not show that most oil fields are filled by hydrocarbons rising from the mantle.
A 2002 paper by Barbara Sherwood Lollar and colleagues describes natural hydrocarbons as “largely formed by the thermal decomposition of organic matter (thermogenesis) or by microbial processes (bacteriogenesis).” It characterizes abiogenic alkane formation as a minor source for global hydrocarbon reservoirs, without assigning a numerical share. Read the paper in Nature.
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How the explanations differ
| Formation pathway | Mechanism | Evidence described in the cited sources | What that evidence establishes |
|---|---|---|---|
| Thermogenic | Heating and decomposition of organic matter | Source-rock and isotope evidence discussed in the geological literature | A major natural pathway for hydrocarbons; the 2002 paper says natural hydrocarbons are largely formed this way or through microbial processes |
| Microbial (bacteriogenic) | Processes involving microorganisms | Geological evidence discussed alongside thermogenesis in the 2002 paper | A recognized natural pathway; the cited source does not quantify its global share separately |
| Abiogenic | Non-biological reactions involving inorganic precursors | Natural occurrences in geological settings and controlled high-pressure laboratory synthesis | Abiogenic hydrocarbons can form and occur; the cited sources do not establish a commercial-scale contribution or a global percentage |
The evidence operates at different scales: a laboratory reaction demonstrates chemical possibility; a natural occurrence shows that a substance exists in a geological setting; neither alone establishes how much petroleum accumulates in recoverable deposits. Migration into crustal reservoirs and accumulation at commercial scale are separate questions the 2009 experiment did not resolve.
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No such conclusion follows from the experiment. Producing hydrocarbons in a laboratory under upper-mantle-like conditions does not show that natural production is fast enough, that the products reach existing fields, or that they replenish extraction at a meaningful rate. The paper’s result is narrower: methane can partly react to form larger hydrocarbons under the tested conditions.
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How much petroleum is abiogenic?
The cited sources do not provide a current global percentage for petroleum attributable to abiogenic processes. The 2002 paper calls abiogenic alkanes a minor source for global hydrocarbon reservoirs, but does not quantify that description. The 2009 experiment supplies no estimate of natural production or commercial deposits. A percentage cannot be calculated from its pressure and temperature results.
In a 2009 Scientific American report, petroleum geologist Wayne Ahr said, “I don’t think anybody in the research field doubts that methane could be formed this way.” Geochemist Barry Katz responded, “I disagree with the idea of commercial quantities.” These are attributed comments in a report from 2009, not a current survey of professional opinion. Read the report in Scientific American.
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