Wow something I actually can be an expert on (petroleum geologist).
The "tar/hydrocarbons" he hypothosizes about is something like 26 miles down.
To give perspective, the deepest wells are in the 5 mile range, with a few in the 7ish mile range --- and there have been probably 300-400 of these ultra-deep wells ever drilled.
They actually hunted for this abiotic oil, drilling in some sea-floor areas where the Earth's crust was thinish -- the amazing machanical problems got in the way.
The oil/gas we use is almost certainly biotic --- the consistent corrolation with reefs and other structures of something that used to be alive (while they may merely be a "trapping" structure) is far too coincidental.
Personally, I opine that there might very well be abioltic tar somewher down there, but: (1) good luck getting there and (2) ever more good luck getting it to flow ("communicate" to your wellbore.
You need porosity of some kind -- cracks, holes, sand, whatever --- and that depth almost certainly smushed the heck out of any "empty" space where hydrocarbons might reside.
You've just made me more curious. I suppose if someone has invested millions of dollars drilling, It must have some plausibility.
Just out of interest, what proportion of professional petroleum geologists do you think are young-earth-creationists? Hav you ever met any significant number?