GEOCHEMISTRY OF LATE DEVONIAN OILS OF THE TIMAN-PECHORA BASIN
D.A. Bushnev1, N.S. Burdel’naya1, O.V. Valyaeva1, A.A. Derevesnikova2
1Institute of Geology, Komi Science Center, Ural Branch of the Russian Academy of Sciences, ul. Pervomaiskaya 54, Syktyvkar, Komi Republic, 167982, Russia
2Syktyvkar State University, Oktyabr'skii pr. 55, Syktyvkar, Komi Republic, 167001, Russia
Keywords: Timan-Pechora basin oil, biomarkers, domanikites, alkylbenzenes, carbon isotope composition of oils
Abstract
The composition of biomarkers and aromatic hydrocarbons of Late Devonian oils of the- Timan-Pechora petroliferous basin has been studied. It shows that the organic matter of oil-generating deposits is at the close stages of thermal maturity, which are within the early and middle stages of the oil window. Five groups of oils have been recognized, three of which were generated by organic matter of Domanik deposits and the other two formed from organic matter of another source. Most of the studied oil samples contain derivates of isorenieratene indicating that the organic matter of oil source rocks formed in the photic-zone anoxia of the paleobasin.
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