Groundwater of Middle Jurassic deposits of the southern regions of the Komi Republic

Abstract

The features of the chemical composition of fresh groundwater of the Middle Jurassic aquifer complex in the southern regions of the Komi Republic, which is the main source of drinking water supply, are shown. Groundwater is mainly confined to the sole, composed of quartz sands, of the Sysol formation of the Middle Jurassic (J2ss) and is distributed at depths from 13.7 to 119 m. The waters are confined to the zone of active water exchange, to the areas of infiltration of atmospheric precipitation in the territory with a humid climate. The waters have a bicarbonate-calcium composition, a near-neutral medium, mineralization up to 0.58 g/dm3 and after preliminary water treatment (degreasing, demanganation) can be used for drinking purposes. Based on the conducted geochemical studies and statistical data processing, the main patterns of the distribution of macro- and micro–components in the groundwater of the Middle Jurassic sediments have been established, the leading processes of formation of the main components of the chemical composition of groundwater — oxidation, hydrolysis, cation exchange and sulfate reduction — have been identified.