Does anyone buy into the theory of abiotic oil?
https://www.nasa.gov/mission_pages/cassini/media/cassini-20080213.html
Hydrocarbons are found on Titan. I don’t think oil comes from dinosaurs or plant life.
Not sure about oil—perhaps gas is legit.
Subduction of tectonic plate edge carries a lot of carbon bearing rock and water deep into the Earth’s mantle. Hydrogen from water, carbon from limestone, and ample heat energy might cook up some natural gas. Whether that leads to heavy hydrocarbons awaits more evidence.