The article presents the results of studies of the Ural folded system, located in the articulation zone of the Pre-Ural regional trough and the West Ural outer folding zone, based on a statistical study of the organic matter of Silurian rocks and modeling the processes of generation, migration, accumulation, conservation, destruction and redistribution of hydrocarbons in geological time. The study area has a high oil and gas potential. Despite the difficulties of studying the bottoms of Paleozoic deposits, it is these deposits that are of interest from the point of view of the prospects for oil and gas content. In the geochemical analysis, statistical processing of the previously obtained pyrolysis results according to the Rock-Eval method of Silurian parent rocks was carried out, the generation potential was determined. Four proven generational-accumulation systems were modeled: cisuralian Permian, Visean-Bashkirian, Fransian-Tournaisian, Lower Devonian-Fransian, and one supposed Silurian system. In thermobaric analysis, the distribution of the geothermal gradient, the distribution zones of abnormal pore pressures, hydrostatic pressures, and water pressure regimes have been studied. A comparative analysis of migration-accumulation processes within the study area in fluid-conducting and fluid-conducting faults was carried out. The distribution of hydrocarbon resources by area coincides with the fields known to date, which indicates the reliability of the constructed geological model. The results of the research will contribute to the understanding of a single picture of the formation of accumulations of oil and gas, as well as to assess the impact of the alleged sources of hydrocarbons in the region; identify the foci of hydrocarbon generation, develop and expand opportunities in solving urgent problems of localization and spatial distribution of hydrocarbon raw materials in traps, as well as revise the resources regional assessment.
References
1. Monakova A.S., Osipov A.V., Bondarev A.V. et al., Geokhimicheskaya kharakteristika neftematerinskikh porod yuzhnoy chasti predural'skogo progiba, otsenka realizatsii siluriyskikh porod (Geochemical characteristics of oil-bearing rocks of the southern part of the pre-Ural depression, assessment of the realization of Silurian rocks), Proceedings of 9th International Geological and Geophysical Conference EAGE “Sankt-Peterburg 2020. Geonauki: transformiruem znaniya v resursy” (St. Petersburg 2020. Geosciences: transforming knowledge into resources), Moscow, 2020, p. 120.
2. Osipov A.V., Bondarev A.V., Mustaev R.N. et al., Results of geological survey in the eastern side of the southern part of the Pre-Urals foredeep (In Russ.), Izvestiya vysshikh uchebnykh zavedeniy. Geologiya i razvedka, 2018, no. 3, pp. 42–50.
3. Bondarev A.V., Dantsova K.I., Barshin A.V., Minligalieva L.I., Modeling maturity of organic matter in source rocks of silurian oil and gas source strata of Southern Urals based on statistical processing of Rock-Eval results (In Russ.), Trudy Rossiyskogo gosudarstvennogo universiteta nefti i gaza imeni I.M. Gubkina, 2020, no. 1(298), pp. 29–37, https://doi.org/10.33285/2073-9028-2020-1(298)-29-37
4. Bondarev A.V., Barshin A.V., Dantsova K.I., Minligalieva L.I., Modelirovanie katageneticheskogo preobrazovaniya neftegazomaterinskikh tolshch na osnove statisticheskoy obrabotki piroliticheskikh rezul'tatov (Yuzhnoe Predural'e) (Modeling of catagenetic transformation of oil and gas reservoirs on the basis of statistical processing of pyrolytic results (Southern Pre-Urals)), Proceedings of IX International Scientific Conference of Young Scientists “Molodye – Naukam o Zemle” (Young - Science of the Earth), Moscow, 2020, pp. 269–270.
