Interesting point to bring up.
I think the only reason why the abiotic theory hasnt taken the world by storm is that it fails to explain the molecular origin of crude oil.
While the biotic theory says that oil is the "pressurised" remains of sea-flora and fauna (just like coal = pressurised wood), the abiotic theory
cannot explain where this material comes from.
Does it perhaps mean that oil is a naturally occuring liquid? Would we not eventually use it up even if reserves kept replenishing, eventually it must
run out. Unless the oil is produced in the core of the earth, which seems completely out of question, since it would be burnt off.