At the Verkhnechonsky oil and gas condensate field, brine-saturated reservoirs containing lithium and other valuable elements are concentrated in both subsalt and inter-salt complexes. Subsalt complexes have been operated for 17 years using hydrocarbon feedstock with the reservoir pressure maintenance system, which leads to dilution of concentrations of valuable components in reservoir waters, the Osinsky horizon is used as a gas storage, and there are no reservoir waters in the Preobrazhenskoye horizon. The most likely objects for industrial development of hydromineral raw materials are the deposits of the Belskaya and Bulayskaya suites of the Lower Cambrian. Despite the large number of production and exploration wells, level of their exploration remains low. Basic information about the structure of promising complexes is provided by modern wells with a full range of well logging, 3D seismic and near-field transient electrical sounding method. Intrusive magmatism is manifested at Verkhnechonsky field which contributed to an increase in the mineralization of brines, including an increase in the concentration of lithium during the stages of tectonic-magmatic activation due to fluid and hydrothermal effects. Granite-gneiss domes are considered as an additional source of lithium. Based on a comprehensive analysis of drilling, borehole and surface geophysics data, subvertical through-leaching zones, karst, subsidence pools and other objects were identified indicating active hydrothermal exploration of the studied sediments by deep fluids. The objects and zones identified at the level of the Khristoforovsky, Atovsky and Birkinsky horizons provide grounds for predicting the presence of highly mineralized brines, suitable for industrial development.
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