Abiotic would mean a geological process taking place over geological time scales. A little bit of leaching in is not enough to counteract the speed at which you can pump down a fresh well.

If merely living in Texas imparted some spiritual knowledge of oil to you, you'd know that entire industry now relies on unconventional extraction from shale, which would not be possible with primitive technology. Again, if oil regenerated on a timescale relevant to humans, they would not need to do this. They go after the shale oil because the normal oil is depleted.