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CONDITIONS OF PETROLEUM POTENTIAL OF THE UPPER YURYAKHA HORIZON IN THE NORTHEAST OF THE NEPA–BOTUOBA ANTECLISE

I. V. Urvantseva 1, A. V. Yukhnevich 1, A. I. Sivtsev 1,2, P. V. Kalinin 3, E. E. Maslova 3

1 Taas-Yuryakh Neftegazodobycha, Irkutsk, Russia; 2 Ammosov North-Eastern Federal University, Yakutsk, Russia; 3 OOO RN-Exploration, Moscow, Russia

The Yuryakha productive horizon is one of the most promising objects for a significant increment in the hydrocarbon resource base in the Republic of Sakha (Yakutia). Its low reservoir properties and compound distribution of the improved reservoir zones are noted. The analytical review of scientific notations about the relationship between petroleum potential of deposits and basement highs is carried out. The absence of lithological varieties in deposits and their thicknesses is shown on the basis of facies analysis of the Yuryakha Formation sections above basement highs and beyond. The influence of basement highs on the productivity of the Yuryakha Horizon is assumed to be limited by creating conditions for the development of secondary processes that potentially increase the void space. It is concluded that the search for zones of improved reservoirs in the Yuryakha formation based on paleogeographic reconstructions is a more promising direction than the justification of point sites with secondary changes.

Keywords: Nepa-Botuoba Anteclise, Yuryakha Formation, basement highs, facies analysis, petroleum potential.

DOI 10.20403/2078-0575-2024-4a-36-45

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