Home – Home – Jornals – Russian Geology and Geophysics 2018 number Неопубликованное

The article presents the results of lithofacial analysis of terrigenous deposits of the Parfenovsky productive horizon of the Vendian (Ediacaran) of the Angara-Lena field (south of the Siberian Platform). The aim of the work is to construct a sedimentation model based on detailed study of core material, petrographic and granulometric data, as well as sequence-stratigraphic interpretation. As a result of the research, 10 lithofacies and 7 lithofacial associations were identified. It was established that the formation of the productive horizon occurred within a deltaic–estuarine system with active influence of tidal processes. Sequence-stratigraphic analysis allowed the identification of two third-order sequences and tracing the evolution of the sedimentary basin, including stages of forced and normal regression, transgression, and highstand of sea level. It is shown that sandstones of the channel facies of the upper delta plain and distributary channels of the lower delta plain, which are widely developed in the southern part of the studied area, possess the best reservoir properties. The obtained results refine the existing understanding of the structure of the Parfenovsky horizon and can be used to predict reservoir development zones during geological exploration and field development.