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Russian Geology and Geophysics

2004 year, number 7

HETEROCYCLIC COMPONENTS OF DISPERSED ORGANIC MATTER AND OILS FROM WEST SIBERIA

L.S. Borisova
Institute of Petroleum Geology, Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia
Keywords: Oil, dispersed organic matter, asphaltenes, kerogen, West Siberia
Pages: 835-845

Abstract

The composition and structure of asphaltenes in oils and dispersed organic matter (DOM) from the Jurassic and Cretaceous deposits of West Siberia were studied by physical and physicochemical methods. The results obtained show that asphaltenes can be used to solve some theoretical and applied problems of oil and gas geology and geochemistry such as identifying oil source strata and revealing genetic relationship in the series DOM-organic matter (OM) of underground waters-oil. We have detected the same asphaltenes in aquagene DOM and oils and have established a genetic relationship between the asphaltenes of bitumens from underground waters and from coeval rock deposits. These asphaltenes can be used as a genetic indicator as they reflect the structure of OM genetically related to marine or terrestrial vegetation. The parameters of asphaltenes of aquagene and terrigene DOM are shown to change synchronously with the degree of catagenesis. Some aspects of oil sedimentation-migration theory are refined.