Formation of Oil and Gas Fields in Ancient Petroleum Basins (Eastern Siberia)

The work is aimed at searching for new fields and forecasting the distribution of productive oil and gas-saturated formations in the Vendian-Cambrian deposits of Eastern Siberia. Since the anticlinal theory of hydrocarbon exploration has exhausted its potential in ancient petroleum basins, it is necessary to look for new approaches to forecasting oil and gas potential and mechanisms of fields. The authors used the classical approach of basin analysis developed by the founders of the Petroleum Geology Department of the Lomonosov Moscow State University, using modern research methods. For the main tectonic elements of the south of the Siberian platform, the thickness of eroded deposits was determined, one-dimensional (1D) geological models were constructed that determine the operating time of hydrocarbon systems, and an analysis of changes in the structural plan at all stages of geological development of the territory was performed. The obtained results are linked to each other to establish the time of formation of hydrocarbon deposits and the stages of their reformation and destruction due to changes in the structural plan. The second phase of generation of Proterozoic oil and gas source strata in the Mesozoic era is shown. Conclusions are made about the expansion of the Nepa-Botuobinskaya anteclise by 50–100 km due to the inversion of the structural plan in the southeastern part, from the side of the Baikal folded region. Models of the formation of deposits for the Kurey syneclise and the Nepa-Botuobinskaya anteclise are created, the most promising areas for the development of the Srednebotuobinskoye field are identified and a new approach to searching for deposits in the south of the Siberian platform is proposed.

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