ORGANIC MATTER OF DOMANIK DEPOSITS OF THE TIMAN-PECHORA BASIN: THE OIL WINDOW CONDITIONS
D.A. Bushnev1, N.S. Burdel’naya1, A.N. Shadrin1, N.P. Fadeeva2, M.B. Smirnov3
1Institute of Geology, Federal Research Center “Komi Science Center of the Ural Branch of the Russian Academy of Sciences”, Syktyvkar, Russia
2Lomonosov Moscow State University, Moscow, Russia
3Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, Russia
Keywords: Organic matter, Domanik deposits, bitumen, hydrocarbon biomarkers, maturation, carbon isotope composition, Timan-Pechora Basin
Abstract
A comprehensive study of Domanik deposits of the Timan-Pechora Basin has been carried out. The examined composition of hydrocarbon biomarkers, chemical structure of kerogen, carbon isotope composition, and rock lithology, the Rock-Eval pyrolysis data, and the contents of bitumen and Corg in the rocks give an insight into the geochemical processes in the oil window in the Domanik deposits, which took place at Tmax = 435-450 ºC. The bitumen coefficient βCB is maximum in this temperature interval, reaching 30 %. The obtained data on the distribution of polycyclic biomarkers in the Domanik rocks and the bituming and Rock-Eval pyrolysis data allowed determining the boundary values of biomarker maturity coefficients in the study of the maturation of organic matter of the rocks. The carbon isotope composition of bitumen fractions in the Domanik rocks is considered, and the bimodal distribution of the δ13C values of the bitumen is shown.
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