Also
https://en.m.wikipedia.org/wiki/Thermal_depolymerizationAlso
https://en.m.wikipedia.org/wiki/PyrolysisBasically if any carbon form which is just long chains of hydrogen are and carbon atoms is heated to a great degree without oxygen it does not burn it actually breaks down into its individual atoms and then that can easily be recombined with water and to making oil. The molecules along themselves in the long chains that form what we call crude oil.
This happens constantly inside the earth and it doesn't take very long and it can use any carbon form. It can be done mechanically by people and is being done by many companies now in that large steel containers in less than an hour.
It is absolutely proven beyond the shadow of a doubt that oil is not a fossil fuel and it does not have limited quantities but it's actually being made constantly all the time.
Here is an old company doing it
https://www.discovermagazine.com/technology/anything-into-oil-03
Razzoriel -4 points 5 months ago
Oil IS a fossil fuel. But what fossils are on its composition its still a mystery. No one doubts the conditions to generate more oil as carbon "fossilizes" exist. But if you say it takes as long as "days"? Not sure. Maybe atmospheric pressure is involved too, so only after a certain amount of pressure and proximity to the Earth's core.