There is a theory pursued by the Russians that oil is not a fossil fuel at all but is generated deep under the crust my microbes. As evidence some oil wells in the gulf which were thought depleted have resurged.
Which pretty much nobody takes seriously.
As evidence some oil wells in the gulf which were thought depleted have resurged.
You can get some movement of oil among reservoirs, but the claim of this as "proof" of abiogenic oil is essentially somewhere between a gross exagerration and a lie.
The Deep, Hot Biosphere
by Thomas Gold
foreword by Freeman Dyson