Uhh, we also haven't dug up all the gold in the earth and it's worth way more than oil and we've been mining it for thousands of years. Just because something isn't all gone from the Earth doesn't mean it must be continually formed there, it might simply be because the Earth is massive and has massive amounts of things in places we haven't even looked for it yet.

That said, I agree with the evidence of the theory of the abiogenic origin these fuels.