Kontorovich info 2.2018 | oilandgasgeology

Якорь 1

A.E. Kontorovich, E.A. Kostyreva, S.V. Rodyakin, I.S. Sotnich, P.A. Yan

Geochemistry of the Bazhenov Formation bitumoids

DOI: 10.31087/0016-7894-2018-2-79-88

The organic geochemistry of bitumoid сhloroform extracts was studied using a large suite of the Bazhenov rock samples (786) collected from 23 wells. The method of extraction of allochtonous, para-autochthonous and sorbed autochthonous bitumoids was proposed. Cylindrical (regular-shaped) samples, 4–5 mm (coarse) and up to 0.25 mm (fine) crushed fractions of samples were subject to extraction following the extraction of coarse-grained fraction. Identity of extraction of regular shaped and coarse-grained fractions of samples was determined. The methodology of separation and identification of autochthonous and allochtonous (including para-autochthonous) bitumoids was considered. Pyrolysis data and the results of bituminological analysis of organic matter from the Bazhenov Formation revealed a variation in characteristics of organic matter sampled from different sections of the formation, which depends on the level of thermal maturity. To clarify the spatial patterns in these characteristics, the study area was divided into several regions. It is shown that the bitumoid content is a function of thermal maturity of organic matter. The maximum content of allochthonous bitumoids was ascribed to regions where the Bazhenov rocks have entered the oil window. The results also show that autochthonous bitumoids are more enriched in resins and asphaltenes than allochthonous ones. The study of biomarker distribution (steranes, triterpanes) in the saturated fractions of allochthonous and autochthonous bitumoids revealed their genetic affinity. It was shown that lipids in archaea, bacteria and protozoan eukaryotes were the principal source for aquatic organic matter from the Bazhenov Formation.

Key words: organic matter; bitumoid; Bazhenov Fm; West Siberia.

For citation: Kontorovich A.E., Kostyreva E.A., Rodyakin S.V., Sotnich I.S., Yan P.A. Geochemistry of the Bazhenov Formation bitumoids. Geologiya nefti i gaza. 2018;(2):79–88. DOI: 10.31087/0016-7894-2018-2-79-88.

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A.E. Kontorovich