Hydrogeological uniqueness of groundwater in the Cherkashinsky area of the Tobolsk district of the Tyumen region

Intensive development of the Tyumen region, where the largest West Siberian megabasin is located (the Tyumen groundwater deposit is the largest in Russia), violates the natural state of ecosystems, in particular groundwater, which is the basis of an ecosystem vital to the health of the planet. Currently, the significance of groundwater is often underestimated. Professor Robert Reinecke from Johannes Gutenberg University Mainz emphasizes that groundwater should be considered as a crucial ecosystem. This is because groundwater is a major ecosystem itself, also it plays a critical role in the earth surface. So what is the hydrogeological uniqueness of the groundwater of the Cherkashinsky area in the Tobolsk district of the Tyumen region? Mineral and thermal groundwater, historically termed "medicinal water," are essential. In the early 20th century, "mineral water" was synonymous with "medicinal water." Today, groundwater is utilized not only as a mineral resource for extracting valuable components like bromine and iodine but also as technical water. Technical water have special requirements. This is due to the need to assess the geochemical compatibility of formation fluids and injected fluids, because forecasting equilibrium can help prevent problems of salt deposition in oil fields. The difficult procedure for determining the compatibility of injected water and formation water complicates the operational use of hydrochemical data, in especially in monitoring calcite precipitate. The aim of this article is to present the groundwater composition and evaluate the geochemical compatibility of formation fluids and injected fluids in the Cherkashinsky area. Studying this science topic, we mostly used method of atomic-absorption analysis and the geochemical compatibility of formation fluids and injected fluids. This study examines the value of concentration and potential accumulation of micro-components (bromine and iodine) in groundwater, defined by the geological and hydrogeological conditions of this area. Additionally, we have identified a computational method of compatibility of mixed waters based on calcite and gypsum. Also, we showed the dependency of calcium salt solubility in a multi-component mixture on temperature, pressure, and the partial pressure of carbon dioxide.