I have done well over a thousand geochemical analysis of oils from 6 continent’s basins over 20+ years as a petroleum geologist I have never once seen a single sample that did not carry biological markers from micro algae,diatoms,or foraminifera on three very rare occasions I saw coaly resinitic signatures that was a very rare case in the Pinghu Formation in East China. The isotopes of O16/O18 also confirm biological origin of every oil I have ever sampled. Abiotic oil is a myth no working professional geologist has gotten anyone else in the field to do a peer reviewed confirmation of it. If you have a peer reviewed study with geochem and isotopic analysis id love to see it.