LITHOLOGY, GEOCHEMISTRY, AND ASPECTS OF SEPARATION OF THE KOGALYM MEMBER WITHIN THE LOWER VASYUGAN SUBHORIZON (upper bathonian-lowermost oxfordian) OF WEST SIBERIA
P.A. Yan1, L.G. Vakulenko1,2, E.A. Kostyreva1, Ya.G. Aukhatov3, O.V. Burleva1, O.D. Nikolenko1
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
3Kazan Federal University, ul. Kremlevskaya 18, Kazan, 420008, Russia
Keywords: Lithology, regional stratigraphy, Callovian, Oxfordian, Vasyugan Horizon, geochemistry of organic matter, West Siberia
Abstract
It is proposed to separate a regionally persistent member of fine-dispersed mudstones as the individual Kogalym Member within the Lower Vasyugan Subhorizon (Uppermost Bathonian-Lowermost Oxfordian). We present data on the lithologic composition, geophysical characteristics, and geochemical properties of the organic matter and depositional environments of the member. The Tyumenskaya SDB-6 well is proposed as a type section of the Kogalym Member, where a biostratigraphic approach has yielded the Middle-Upper Callovian volume of the member. We also discuss the aspects of specification and detalization of the Callovain-Oxfordian part of the Callovian and Upper Jurassic regional scheme of West Siberia.
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