[stig]

Research Abiogenic petroleum

A quick google search turned up a bunch of references. Two that seemed interesting:

A scientific review of abiogenic theory in Reviews in Geophysics
Deep-seated abiogenic origin of petroleum: From geological assessment to physical theory

and a Forbes article from 2008 that mentions Thomas Gold by name and unnamed Russian and Ukrainian scientists that hold to the theory.
Endless Oil?

In a nutshell we find hydrocarbons in places we shouldn't based on a biomass theory.

[jonascord]

As an addendum, consider that if you put methane, CH4, (One carbon, 4 hydrogen molecules.), CO2, (One Carbon, 2 Oxygen.) and water in a pressure vessel and cook it under high pressure and heat, you get a hydrocarbon goo. This experiment/alchemy dates back to the 1800's.

Another is that while oil spills are bad, they are also temporary. This cleanup is slow, but the Earth is patient. Select bacteria thrive on the stuff, even deep underground. Almost as if they had evolved to use it as a permanent food source...

Drillers reopening old wells to dispose of salt water have found oil in assumed to be depleted fields.

[SauronOfMordor]

It doesn’t matter if oil is still being produced. What matters is if it’s being produced at a rate anywhere near the rate it’s being consumed.