GEOCHEMISTRY OF ORGANIC MATTER IN THE BAZHENOV FORMATION ON THE NORTH-EASTERN SIDE OF THE NYUROL MEGA-DEPRESSION (SOUTH-EAST OF WESTERN SIBERIA)
I.S. Sotnich1, E.A. Kostyreva1
1Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch Russian Academy of Sciences, Novosibirsk, Russia
Keywords: organic matter, bitumoids, hydrocarbon biomarkers, pyrolysis, catagenesis, maturity, Bazhenov Formation, Western Siberia.
Abstract
The article presents the results of detailed organic geochemistry studies being part of a comprehensive (lithological, geochemical, petrophysical) study of the Bazhenov Formation in the Tomsk Region using the IPGG SBRAS methodology for organic matter-rich source rock. As the thermal maturity increases from PK3 to MK2, the content of 'free micro oil' in source rock's pore spaces has been observed to increase. In the same time, there are modifications to the composition of bitumoids (chloroform source rock extracts) from open and closed pores at both the group and molecular levels. Even 'immature' organic matter has been establish to show a difference in bitumoids composition from open and closed pores, which increases as it enters the main phase of oil formation.
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