SUBSTANTIATION OF THE PRE-TIRSKY BREAK EXISTENCE WITHIN THE NEPA-BOTUOBA ANTECLISE

L. V. Ryabkova, N. V. Mangazeeva

Siberian Research Institute of Geology, Geophysics, and Mineral Resources, Novosibirsk, Russia

The pre-Talakhsky, pre-Verkhnenepsky, pre-Tirsky, and pre-Danilovsky sedimentation breaks have been discovered in the Vendian deposits within the Nepa-Botuoba anteclise. The latest deep drilling data allowed specifying the characteristic features of the breaks and their extension territory, which contributed to a more reliable estimate of the prospects of petroleum plays (Nizhnenepsky, Verkhnenepsky, and Tirsky) located between the breaks. According to the data available, the occurrence of the pre-Tirsky break is due to unconformities in the Byukskaya (Tirskaya) Formation, including both its lower (Botuobinsky horizon) and upper subformations, overlying the Kharystanskaya, Ynakhskaya formations and different parts of the Verkhneparshinskaya Formation of different ages.

Key words: Vendian deposits, facies rocks replacement, sedimentation breaks, formation description, southeast of the Siberian Platform.

DOI 10.20403/2078-0575-2017-2-50-57

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