This might be totally left field and I'm not saying I believe it al but:
about a year ago I was listening to a late night radio talk show, and the guest who was a geologist with a major oil company <shell I think> was talking about how they have found that some oil fields in the gulf that had been pretty much pumped dry of the light sweet crude had somehow managed to REFILL with light sweet crude.
He went on to talk about how there is a growing movement among geologists/scientists that oil "might" be a naturally acuring substance from deep in the planet. He made the argument that with all the staggering amounts of oil we have already pumped and whats still in the ground, "do you think it ALL came from dead dino's and plants?"
Just think, if it was ever PROVEN that it is a natural resource from deep in the earth that continually bubbles up....well you could kiss off the middle east