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FORECAST OF OIL AND GAS CONTENT OF YU2–4 SILTY-SANDY BEDS OF THE IRTYSH–DEMYANKA INTERFLUVE BASED ON THE COMPLEX ANALYSIS OF GEOLOGICAL-GEOPHYSICAL AND LITHO-PETROPHYSICAL DATA

Ye. S. Taffarel 1, Ye. A. Predtechenskaya 2, Z. Ya. Serdyuk 2

1 LUKOIL-Engineering, Moscow, Russia; 2 Siberian Research Institute of Geology, Geophysics and Mineral resources, Novosibirsk, Russia

The article substantiates the criteria for forecasting the oil and gas potential of the Middle Jurassic Yu2–4 beds in the Irtysh–Demyanka interfluve. The data on the spatial distribution, structure, material composition, genesis, reservoir properties and oil and gas potential of rocks are taken into account. Specific changes in the lithological composition and texture of rocks associated with the polyfaciality of deposits are characterized, and intervals of improved reservoir properties are identified. Based on the analysis of core material and interpretation of well log data, correlation schemes and schematic geological and geophysical sections of the Upper Bajocian-Bathonian deposits, including a group of Yu2–4 beds, are constructed. Information is given on the main industrial and prospective oil and gas complexes within the Uvat and Salym petroleum areas as part of the Frolov petroleum region. Along with productive formations, screening formations and potential source rocks are characterized. As a result of the integration of geophysical, lithological and petrophysical data, information about tests and the degree of oil saturation of the Yu2–4 beds, zones promising for hydrocarbon prospecting have been identified. Expected types of reservoir traps for the Yu2–4 beds are characterized.

Keywords: West Siberia, Irtysh–Demyanka interfluve, Middle Jurassic, Yu2–4 beds, reservoir properties, oil source strata, trap types, oil and gas prospects.

DOI 10.20403/2078-0575-2019-4-37-58