PHENANTHRENES, AROMATIC STERANES, AND DIBENZOTHIOPHENES IN JURASSIC DEPOSITS OF THE WEST SIBERIAN PETROLEUM PROVINCE: IMPLICATIONS FOR ORGANIC GEOCHEMISTRY
A.E. Kontorovich, V.N. Melenevsky, E.N. Ivanova, and A.N. Fomin
Institute of Petroleum Geology, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Phenanthrenes, monoaromatic steranes, triaromatic steranes, dibenzothiophenes, maturity and type of organic matter
Pages: 824-834
Abstract
Gas chromatography/mass spectrometry of bitumens in various facies of Jurassic rocks from the West Siberian petroleum province was applied to investigate the composition of phenanthrenes, mono- and triaromatic steranes, and sulfur-bearing dibenzothiophenes and their methyl homologs. Phenanthrenes and their methyl homologs form mostly in organic matter (OM) of land origin and phenanthrenes and aromatic steranes predominate in marine OM. Steroids of buried marine OM mostly transform into triaromatic steranes and those of terrestrial OM into monoaromatic steranes. The distribution of phenanthrenes, aromatic steranes, and dibenzothiophenes shows regular dependence on the maturity of organic matter.
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