There are good reasons that oil is only found in very specific geological formations. Unless there is a dome shaped impervious capstone, the oil will escape to the surface, and burn or evaporate. Unless there is a porous reservoir beneath the capstone, oil will not flow from the reservoir. Without a pressured aquifer beneath the reservoir the oil will not be trapped under the dome.
As to abiotic oil - it would still have to collect in these formations, and the formations that we have been pumping are not refilling, so the seepage from the deep hot biosphere is not sufficient to stave off peak oil.