Characteristic features of the hydrocarbon composition of Paleozoic oils from the southeast of Western Siberia

Distinct features of crude oils from Nyurol’ka Depression (Southeast of Western Siberia)

“…According to studies, the main feature of Nyurol'ka Depression oils is the presence of aryl isoprenoids (Chirkova et al, 2014(Chirkova et al, , 2017. Aryl isoprenoids derived from aromatic carotenoids isorenieraten and ß-isorenieraten (Hartgers et al, 1994;Brocks and Schaeffer, 2008), which were produced by green sulfur bacteria Chlorobiaceae (Summons and Powell, 1987), and their presence indicates photic zone anoxia (PZA) in the sedimentary basin (Koopmans et al, 1996).…”