Not quite so impressive. This is why I prefer scientific articles. Again, it would've helped if Gold wasn't so virulently on a crusade denying that biologic crude can't be biological.

Petroleum shows the 13C depletion to an even greater degree than its supposed organic source matter, but in a ratio similar to that of the lipid fractions of those organisms.

Gold theorizes that carbon-bearing molecules diffusing through a porous mass, in any process, results in fractionation that favors the lighter 13C isotope.

"Biology is not a nuclear reactor. It can't make carbon-13 or carbon-12. But it's treated in the literature that the 12C-13C preference is strictly a plant matter," Gold said. "It's quite clear that there is an isotopic fractionation occurring in the migration path."

Bing! Try again. This is so blatantly fraudulent, it's shameful. Biological processes perform exactly what Gold tries to deny here: isotopic fractionation. But Gold puts his money on a migrationary fractionation - which yes, is all too common in petrologic (note: that has nothing to do with petroleum!) processes, such as magma differentiation. But the role of biological processes in C12-C13 fractionation is indisputable. He really missed out on Occam.