THE GEOCHEMISTRY OF CAMBRIAN ORGANIC MATTER FROM THE CIS-YENISEI SUBPROVINCE ( evidence from the wells Vostok-1 and Vostok-3)
A.E. Kontorovich, E.A. Kostyreva, S.V. Saraev, V.N. Melenevskii, and A.N. Fomin
A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, 630090, Novosibirsk
Keywords: Petroleum potential, organic matter, Cambrian, catagenesis, bitumens, biomarker hydrocarbons, anthraxolites
Pages: 571-582
Abstract
The paper presents the first comprehensive geochemical data, obtained by modern techniques, on the dispersed organic matter (OM) of the Cambrian sediments in the Upper Proterozoic-Paleozoic Cis-Yenisei sedimentary basin (parametric wells Vostok-1 and Vostok-3). The carbonaceous rocks of the Churbiga and Paidugina Formations have been established to be the most OM-enriched in the studied Cambrian sections. The OM in these sections is of aquagene (bacterial, plankton-derived) origin. The detailed characteristics of biomarker hydrocarbons has been given for the fraction of saturated hydrocarbons. Also, the high degree of OM catagenesis (apocatagenesis) has been established. Finally, geochemical criteria for predicting the petroleum potential have been considered.
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