Journal V.24.No.2.2022
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Conditions of sedimentation and distribution of organic matter in the Lower-Middle Jurassic complex of the South-Western part of the West Siberian oil and gas basin

I.K. Komkov, A.V. Mordasova, M.V. Dakhnova, S.V. Mozhegova, M.A. Bolshakova, N.V. Pronina

Original article

DOI https://doi.org/10.18599/grs.2022.2.15

150-171
rus.

open access

Under a Creative Commons license
The article is devoted to the variation of generation potential of the Lower-Middle Jurassic organic matter in the Karabash area (South-Western part of the West Siberian basin) depending on facies and sedimentary cyclisity. Based on geochemical and lithological core studies, specific geochemical features of organic matter established for main facies groups of Early-Middle Jurassic in the study area. The best generation potential inherent in deposits of swamps, swampy floodplains and tidal plains. These facies groups characterized by predominance of the continental organic matter and considered to gas source rocks. However, macerals composition, kinetic spectra and biomarker analysis show the presence also of marine organic matter. Some facies groups, such as flooded swamps and swampy floodplains has potential to generate hydrocarbons due to preservation of liptinites with high hydrogen index. Cyclic analysis with basics of sequence stratigraphy of the continental deposits allow tracing the correlation between generation potential and relative sea level changes.
 
generation potential, geochemistry of organic matter, Shercalin formation, Tyumen formation, Karabash area, West Siberian basin, Lower-Middle Jurassic, facies, cyclisity of the continental sedimentation
 
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Ivan K. Komkov – Engineer, Petroleum Geology Department, Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation
 
Alina V. Mordasova – PhD (Geology and Mineralogy), Researcher of the Petroleum Geology Department, Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation
 
Marina V. Dakhnova – DSc (Geology and Mineralogy), Head of the Department of Geochemical Methods for Prediction of Oil and Gas Potential, All-Russian Research Geological Oil Institute (VNIGNI)
36, Shosse Entuziastov, Moscow, 105118, Russian Federation
 
Maria A. Bolshakova – PhD (Geology and Mineralogy), Researcher of the Petroleum Geology Department, Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation
 
Svetlana V. Mozhegova – Senior Researcher, Department of Geochemical Methods for Prediction of Oil and Gas Potential, All-Russian Research Geological Oil Institute (VNIGNI)
36, Shosse Entuziastov, Moscow, 105118, Russian Federation 
 
Natalia V. Pronina – PhD (Geology and Mineralogy), Associate Professor, Petroleum Geology Department, Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation 
 

For citation:

Komkov I.K., Mordasova A.V., Dakhnova M.V., Mozhegova S.V., Bolshakova M.A., Pronina N.V. (2022). Conditions of sedimentation and distribution of organic matter in the Lower-Middle Jurassic complex of the South-Western part of the West Siberian oil and gas basin. Georesursy = Georesources, 24(2), pp. 150–171. DOI: https://doi.org/10.18599/grs.2022.2.15

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