This information backs up the idea that Earth is actually an oil-producing machine. We call energy sources such as crude oil and natural gas fossil fuels based on the assumption that they are the products of decaying organisms, maybe even dinosaurs themselves. But the label is a misnomer. Research from the last decade found that hydrocarbons are synthesized abiotically.
In other words, as Science magazine has reported, the “data imply that hydrocarbons are produced chemically” from carbon found in Earth’s mantle. Nature magazine calls the product of this process an “unexpected bounty ” of “natural gas and the building blocks of oil products.”
How Fast Can Oil Form?