Although simple thermogensis adequately describes petroleum generation,
geocatalysis involving reactive mineral surfaces, clays, trace metals, or
organic species have been proposed.55,56 Such processes are highly
speculative, and it is difficult to image how inorganic agents would remain
activated under subsurface conditions or how mass transport limitations
inherent in solid-solid interactions could be circumvented57

Perhaps oil has always been in existence since the beginning of the universe.

Saturn's orange moon Titan has hundreds of times more liquid hydrocarbons than all the known oil and natural gas reserves on Earth, according to new data from NASA's Cassini spacecraft. The hydrocarbons rain from the sky, collecting in vast deposits that form lakes and dunes.

The new findings from the study led by Ralph Lorenz, Cassini radar team member from the Johns Hopkins University Applied Physics Laboratory, Laurel, Md., are reported in the Jan. 29 issue of the Geophysical Research Letters.

The case is closed-oil is abiotic.