Transformation of the geochemical appearance of fresh groundwater of the Khugotsky field in Western Siberia

The atlum aquifer is used for drinking and domestic water supply at the Khugot freshwater This study is motivated by the need to monitor groundwater quality in the Khugot field intended for drinking and domestic water supply. The long-term operation of the water intake can alter the geochemical composition of the Atlym aquifer water. The aim of this article is to evaluate both the temporal and spatial changes in groundwater composition and identify the factors of its transformation. The objectives include comparing the major ion composition of water samples collected during the development stage with those from current operating period, classifying water types using the Piper diagram, and identifying patterns of ionic composition changes and associated processes. The main method is hydrogeochemical analysis of groundwater samples combined with the interpretations from the Piper diagram. The results show a shift in the prevailing groundwater type. The proportion of samples dominated by sulfate ions increased from 17 % to 100 %, leading to the establishment of a sulfate sodium type; the cation composition (calcium, magnesium) remained stable. Additionally, ongoing gypsum precipitation is diagnosed. The obtained data can be used to optimize groundwater intake operation, predict groundwater quality, and contribute to the development of effective groundwater protection measures. This is where the practical value of the study lies.

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