Patterns of Carbon Isotope Composition Variation of Organic Matter as an Indicator of Sedimentation Conditions

This paper presents an investigation of the isotopic characteristics of organic matter in Upper TriassicJurassic sediments of the West Siberian Basin, which are crucial for understanding the processes of oil and gas formation in the region. Based on detailed isotopic studies of bitumoids, a pattern of isotopic characteristic changes is demonstrated, driven by the influence of facies conditions of sedimentation. The aim of the study was to identify and systematize the regularities of carbon isotope distribution in autochthonous organic matter to create a genetic picture of its formation in various paleogeographic settings of the Jurassic period. Isotope-fractionation analysis of bitumoids allowed us to identify five groups, reflecting the link between the isotopic composition of organic matter and sedimentation conditions within the Frolovsko-Shaimsky, Yamalo-Gydansky, and Urengoy facies regions. The obtained results are of great importance for regional geology and petroleum geology, contributing to the optimization of hydrocarbon exploration and development strategies in the West Siberian Basin and providing new tools for assessing the hydrocarbon potential of sedimentary basins in general.

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