http://en.wikipedia.org/wiki/Abiogenic_petroleum_originHere is a penny for your thoughts. This theory makes alot of sense if you consider some facts about oil wells.
Some of the never dry out and get replenished on a regular basis.
This does not mean we are not using too much of this stuff (whatever it actually is), but the supply of oil wouldn't go to zero. The issue is not that we are using up all the oil but rather that we are using more oil than the earth can produce. People have been fear-mongering about peak-oil & global warming for a long time (since the 40s!
) and each time the time-line was revised. It will be no different this time, except the banking collapse will drive production down.
I am not completely convinced of the correctness of this theory but I do not believe the current "consesnus" either.
peace