NEW DATA ON THE VENDIAN GEOLOGICAL SECTION OF THE SOUTHERN PART OF THE PRE-YENISEI SEDIMENTARY BASIN BASED ON THE RESULTS OF DRILLING AND INITIAL CORE STUDIES OF THE SEVERO-KETSKAYA PARAMETRIC WELL
A.P. Afanasenkov1, I.S. Gribova1,2, V.V. Narkisova2, I.V. Neronova2
1AO Rosgeologiya, Moscow, Russia
2AO NPC Nedra, Yaroslavl, Russia
Keywords: Vendian, geophysical correlation of well sections, lithology, potential reservoirs of oil and gas accumulation, Pre-Yenisei sedimentary basin
Abstract
The Severo-Ketskaya parametric well was drilled by AO NPC Nedra to a depth of 5200 m in the period 2021-2023. The well is located in the southwestern part of the Pre-Yenisei sedimentary basin in the dome zone of the large anticlinal structure of the same name, buried under the Meso-Cenozoic cover. The well uncovered a new carbonate-terrigenous section of the Vendian and carbonate deposits, presumably of Riphean age, for the Pre-Yenisei sedimentary basin. The article substantiates the stratigraphic boundaries of the Vendian on the basis of geophysical correlations with typical sections of the south-west Siberian Platform, presents the general lithological characteristics of the Vendian section and the exposed part of the Riphean (?). According to the data of the preliminary core study, the results of geophysical studies and tests of objects, the deposits of the Upper and Middle Danilovsky subhorizons are the most promising for oil and gas accumulation in the Vendian rock formations in the borehole drilling area. The results of geochemical studies of sections of parametric wells do not allow us to associate high oil and gas potential with the Proterozoic deposits of the Pre-Yenisei sedimentary basin.
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