Oil forever ping!
Lay people think of oil as that stuff in the Pennzoil can they buy at Jiffy Lube, when, in reality, that kind of oil does not exist below certain depths across the world, and that depth depends on the geothermal gradient which exists there.
At least, there has always been a definitive line proven by exploration.
Below those depths we find natural gas and condensate, which is a different product than oil.