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Aromatic compounds in bitumoids of the Bazhenov Formation in the North of the Khantey hemiantheclise

I.S. Sotnich, E.A. Kostyreva

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The main features of the geochemistry of individual aromatic compounds (phenanthrenes, dibenzothiophenes, mono- and triaromatic steroids) in chloroform extracts (bitumoids) from the open (regular form and coarse-crushed (≥0.5 cm) samples) and closed (fine-crushed (0.25 mm) samples) pore space of the Bazhenov Formation have been determined. The differences in the aromatic compounds distribution of organic matter of the Bazhenov Formation in the North of the Khantey hemiantheclise (Surgut region, Khanty-Mansiysk Autonomous District, Western Siberia) are mainly related to its stage of thermal maturity which decreases in the south-west direction within the studying area. The most sensitive to maturity variations at the same catagenesis gradation are the parameters: CPI, Ts/Tm, 1/Ki ((n-C17 + n-C18)/(Pr + Ph)), MDR (4-MDBT/1-MDBT), DBTI ((2+3-MDBT)/DBT) and TASI (TAS I/(TAS I + TAS II)). Based on some indicators (PI, MPI, PP-1, MDR, DBTI etc.), it is possible to notice the decrease and equalization of its values in bitumoids from closed pores compared with those from open ones. It seems to be associated with the removal of the most transformed, light and migratory-capable part of bitumoids during their extraction from the open pore space of rocks.


Organic matter, bitumoids (chloroform extracts), Bazhenov Formation, aromatic compounds, сatagenesis, phenanthrenes, dibenzothiophenes, aromatic steroids


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Inga S. Sotnich
Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of the Russian Academy of Sciences
3, Ak. Koptyug ave., Novosibirsk, 630090, Russian Federation

Elena A. Kostyreva
Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of the Russian Academy of Sciences
3, Ak. Koptyug ave., Novosibirsk, 630090, Russian Federation


For citation:

Sotnich I.S., Kostyreva E.A. (2021). Aromatic compounds in bitumoids of the Bazhenov Formation in the North of the Khantey hemiantheclise. Georesursy = Georesources, 23(1), pp. 42–51. DOI: