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EVOLUTION OF CONCEPTS ABOUT THE STRUCTURE OF OIL AND GAS TRAPS IN THE STUDY OF PETROLEUM BEARING SUBSURFACE RESOURCES IN WESTERN YAKUTIA

V. S. Sitnikov, R. F. Sevostyanova, K. A. Pavlova

Institute of Oil and Gas Problems of Yakutsk Scientific Center, SB RAS, Yakutsk, Russia

The article presents the development history of the oil and gas industry in the Republic of Sakha (Yakutia). It is shown that during the first seismic exploration, prospecting for fields was carried out exclusively in the lower reaches of the Vilyui River. These works made it possible to identify the large Khapchagai gas region in Mesozoic deposits in the eastern Vilyui syneclise and discover a number of gas fields. Traps on them are typical platform structures - brachyanticlines with first degrees of dips, without any traces of disjunctive tectonic dislocations. The latter are predicted here lower in the section, starting from the Permian top. Scientific concepts of oil and gas traps revealed in various years in Western Yakutia in the course of geological exploration, from the period of inition of the oil and gas geophysical service in the republic (1950) to the present, are considered. The evolution of concepts of the oil and gas trap structure is shown, using the example of Srednebotuobinskoye and Verkhnevilyuchanskoye fields. This evolution was carried out in the process of geological exploration due to a more complete record-keeping of disjunctive disllocations and their role in the structure of traps.

Keywords: oil, gas, trap, accumulation, field, structure, Western Yakutia, Siberian Platform.

DOI 10.20403/2078-0575-2021-1-49-55