Characteristics of underground waters in the Lower Permian sediments of the Solikamskaya depression

The Solikamskaya depression and adjacent territories have significant groundwater resources and huge fresh water reserves, which are a unique source for drinking, industrial and industrial water supply. Therefore, the issues of formation of the composition of groundwater water in the Solikamskaya depression are relevant. The main purpose of this work is to study the features of the formation of isotopic (d2Н and d18О) and chemical compositions of groundwater in the Lower Permian sediments of the Solikamskaya depression and the adjacent Kolvinskaya saddle, which are unloaded within the Solikamskaya depression. Groundwater is mainly hydrocarbonate-magnesium-calcium and sulfate-hydrocarbonate-magnesium-calcium composition with mineralization 213-431 mg/dm3, their isotopic composition varies from -14.2 to -16.3 ‰ in d18О and from -107.3 to -119.4 ‰ by d2H. Seasonal changes in the isotopic composition (heavy composition in summer, light - in spring) of groundwater confined to the Lower Permian sediments of the Solikamskaya depression and Kolvinskaya saddle indicate the meteogenic impact on them. In this case, a time delay (one to three months) of the transmission of the isotope signal from precipitation to groundwater is recorded. An increase in mineralization in winter, spring and summer periods, as well as an increase in the content of sulfates and chlorides, suggests that water flows from the underlying horizons through zones of increased fracturing. Thus, groundwater in the Lower Permian deposits of the Solikamskaya depression has a mixed supply.