The molten core of the earth is a refinery of hydrocarbons. They push outward, gassing into open fissures in the earth's crust, expand and cool to precipitate out the oil.
The theory of dead dinosaurs and prehistoric carbonized humus turned into oil is just nonsense.
Oil wells pumped dry in the 1920's have refilled. Imagine that?
I always thought the dinosaur thing seemed ridiculous.
Call me crazy but if oil comes from fossils, why do we drill in the ocean and gulf?