What if you think petroleum has nothing to do with dead animals?
Ah! But coal does have a biological origin!
And three are vast deposits down there, too.
It depends. If you think it just seeps up from the earth's core, then you're a lunatic. If you think it is derived primarily from organic matter like dead plankton, plant material, and fish poop that sinks to the ocean floor and is eventually buried, I'd say you're correct.
Nobody is arguing that oil comes from dead dinosaurs or other reptiles.