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HYDROTHERMAL PROCESSES IN JURASSIC DEPOSITS OF THE KRASNOLENINSKIY AND KAYMYSOVSKIY PETROLEUM REGIONS OF WEST SIBERIA

E. A. Predtechenskaya 1, O. N. Zlobina 2

1 Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia; 2 А.А.Trofimuk Institute of Petroleum Geology and Geophysics, Novosibirsk, Russia

Jurassic sediments of the Krasnoleninskiy and Kaymysovskiy petroleum regions of the West Siberian Petroleum Province served as the exploration target because according to the stratigraphic completeness of sections and the scale of manifestation of superimposed hydrothermal processes can be considered as the most significant targets. The relevance of researches is dictated by the presence of large oil and gas fields in these strata. Sections of a number of wells were studied in the range from the Sharapovskiy to Vasyuganskiy horizons inclusive. Indicator minerals of superimposed hydrothermal processes have been identified, increased values of the catagenesis degree of rocks in the areas under consideration have been established. It was suggested that solutions enriched with CO2 play a significant role in the formation of reservoirs with high reservoir properties. The data obtained can be used to predict development zones of improved reservoirs in petroleum plays o f the West Siberian Petroleum Province.

Keywords: West Siberia, Krasnoleninskiy, Kaymysovskiy regions, Jurassic sediments, deep-seated faults, hydrothermal processes, reservoir properties.

DOI 10.20403/2078-0575-2020-1-40-55