[JimRed]

...wouldn’t oil’s homogeneous nature imply that some process is sythesising the decaying matter?

Temperature and pressure, most likely, with the passage of sufficient time.

[lacrew]

But noimpurities whatsoever. A calcified kidney stone from a dinosaur, a chunk of petrified wood - something?

He is another theory (different than bugs):

http://www.viewzone.com/abioticoilx.html

I know tectonic plates have moved around alot, etc...but doesn’t it also seem odd that oil is continuously found at such great depths...how topsy turvy have the plates been over the years, for all the decayed plant matter to be that deep?