GEOCHEMISTRY OF LOW-MOLECULAR C5-C8 HYDROCARBONS IN OILS AND CONDENSATES FROM WEST SIBERIA
L.S. Borisova and E.A. Fursenko
Institute of Petroleum Geology, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Oil, condensate, organic geochemistry, C5-C8 hydrocarbons, alkanes, isoprenoids, West Siberia
Pages: 813-823
Abstract
We have first generalized data on the composition of low-molecular hydrocarbons in oils and condensates from the Jurassic and Cretaceous deposits of West Siberia and have recognized three genetic types of these petroleum products: (1) marine, genetically related to the oil-producing rocks of the Bazhenov Formation, (2) continental, generated, most likely, from the organic matter of the Lower-Middle Jurassic oil-producing rocks, and (3) mixed. We presented schematic maps of their localization in stratigraphic complexes and identified biodegraded oils and condensates localized in shallow-seated Aptian-Albian-Cenomanian and Berriasian-Hauterivian deposits with low formation temperatures. Vertical migration processes are shown to have played a great role in the formation of oil and gas pools in West Siberia.
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