Tobolsk and Cherkashinsky mineral water districts: similarities and differences

Relevance. The scientific value of the southern territories of the Tyumen Region is due to the significant reserves of groundwater. Object. Mineral waters of the Tobolsk region, especially in the Cherkashinsky and Tobolsk sections of the Tyumen deposit. The total reserves of thermal water in the Tyumen Region reach about 3 million m3 per day. Iodine-bromine waters are concentrated mainly in the inner zone of the mega-basin, with the largest volumes in the Cherkashinsky and Tobolsk sections. Aim. To identify the similarities and differences between the Tobolsk and Cherkashinsky sites, their geological structure, chemical composition of their underground mineral waters, and the prospects for using these waters in the Tobolsk region. Methods. Samples were collected in accordance with recognized methods. Data evaluation and interpretation were performed using Microsoft Excel and Surfer. The geographic coordinates of the wells were recorded using the GPS/GLONASS navigation system in combination with Google Earth and OpenStreamMap. Results and conclusions. The Cherkashinsky and Tobolsk sites are located in the southeastern part of the West Siberian geosyncline, which is divided into two major stages: the pre-Mesozoic and the Mesozoic-Cenozoic. The geothermal waters of the Tobolsk and Cherkashinsky sites are of sedimentary origin. The article provides a stratigraphic and paleontological description of the sections. The studied data on geochemical characteristics indicate the features of groundwater at the Tobolsk and Cherkashinsky quarries. The water extracted from the wells belongs to the I type of chloride-sodium water with a mineralization of up to 17.9 g/dm3. Microcomponents play an important role, with bromine concentrations ranging from 51 to 59 mg/dm3 and iodine concentrations reaching up to 22 mg/dm3. The content of biogens, such as ammonium nitrogen, ammonium, and phosphates, also varies. The distribution of ammonium (NH4) concentration is low, ranging from 14 to 16 mg/dm3, while the background concentrations of phosphates vary from 0.29 to 0.86 mg/dm3. The underground water reserves in the Tobolsk and Cherkashinsky areas of the Tobolsk District of the Tyumen Region are an important natural resource, but their exploitation remains insufficient.