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SEDIMENTOLOGY OF VENDIAN SILICOCLASTIC DEPOSITS OF THE NORTH-EASTERN NEPA-BOTUOBA ANTECLISE

E. M. Khabarov, O. D. Nikolenko

А. А. Trofimuk Institute of Petroleum Geology and Geophysics, SB RAS, Novosibirsk, Russia

The composition, structure and environments of formation of Vendian silicoclastic deposits in the northeastern Nepa-Botuoba anteclise have been eхplored. Using the example of the well drilled with almost complete core sampling in the lower silicoclastic part of the Vendian, the evolution of sedimentation environments from the continental (the lower subformation of the Kursov Formation) to the marine ones of middle and deep shelf (the upper part of the Kursov Formation) is unravelled. Sandstones of the Lower Byuk subformation (Botuoba horizon) are genetically related to the underlying mudstones of the Kursov Formation and represented by deposits of large bar system which has progressed to the deeper part of the basin (according to the classical scheme). This is confirmed by the study materials of sections of other wells. The obtained results show that there are no obvious sedimentological features of regional hiatus in the base of the Byuk Formation and between subformations of the Kursov Formation in the north-eastern part of the Nepa-Botuoba anteclise (Srednebotuobinskoe field).

Keywords: Siberian Platform, Nepa-Botuoba anteclise, terrigenous Vendian, sedimentology, regional breaks.

DOI 10.20403/2078-0575-2018-4-79-87