NEW DATA ON THE VENDIAN GEOLOGICAL SECTION OF THE SOUTHERN PART OF THE PRE-YENISEI SEDIMENTARY BASIN BASED ON THE RESULTS OF DRILLINGANDPRIMARYCORESTUDIES OF THE SEVERO-KETSKAYA PARAMETRIC WELL
A.P. Afanasenkov1, I.S. Gribova1, 2, V.V. Narkisova2, I.V. Neronova2
1Joint Stock Company "Rosgeologiya", Moscow, Russia
2Joint-Stock Company «Scientific and Production Center for Ultra-Deep Drilling and Integrated Study of the Earth's Interior», Yaroslavl, Russia
Keywords: wend, Pre-Yenisei sedimentary basin, geophysical correlation of well sections, lithology, potential reservoirs of oil and gas accumulation.
Abstract
The Severo-Ketskaya parametric well was drilled by JSC NPC Nedra to a depth of 5,200 m in the period 2021-2023. The well is located in the south-west 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 Ripheanage, 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 southwest Siberian Platform, presents the general lithological characteristics of the Vendian section and the exposed part of the Riphean (?). According to the data of the primary core study, the results of geophysical studies and tests of objects, the deposits of the Upper and Middle Danilovskoye subhorizonts are the most promising for oil and gas accumulation in the Vendian complex of rocks in the borehole drilling area. The results of geochemicalstudies of sections of parametricwells do notallow us to associatehigh oil and gas potentialwith the Proterozoic deposits of the Pre-Yenisei sedimentarybasin
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