HYDROGEOCHEMICAL SETTINGS OF THE BORYSLAV– POKUTTIA OIL AND GAS BEARING AREA WITHIN THE CARPATHIAN OIL AND GAS BEARING PROVINCE, UKRAINE

• Date: 2026
• Main Authors: Гарасимчук, В.Ю., Медвідь, Г.Б., Телегуз, О.В.
• Format: Article
• Language: English
• Published: Institute of Geological Sciences, NAS of Ukraine 2026
• Subjects: oil and gas bearing area; aquifer; hydrogeochemical characteristics; groundwater
• Online Access: http://geojournal.igs-nas.org.ua/article/view/349750
• Journal Title: Geological journal

The objective of this study was to investigate the hydrogeochemical characteristics of aquifers within the Boryslav-Pokuttia oil and gas-bearing area, to examine the genesis of groundwater and its influence on the conditions of formation and preservation of hydrocarbon accumulations, and to identify hydrogeochemical criteria of hydrocarbon potential. The research methodology relied on the statistical and graphical processing of verified archival data and the subsequent interpretation of the results obtained. Paleohydrogeological analysis was also applied. It was established that the principal factors controlling the hydrogeochemical parameters of aquifers in the area include the palaeohydrogeological evolution and the degree of hydrogeological isolation. Prolonged and intensive dynamo-elisional development, the fold-and-thrust structural pattern, numerous disjunctive faults, and the presence of evaporite deposits have resulted in the formation of a complex hydrogeochemical system lacking distinct zonation. Genetically, most waters represent sedimentogenic residual brines of evaporitic basins or brines resulting from the leaching of salt-bearing molasse deposits, as well as their mixtures. At shallow depths, mineralised and saline waters enriched in bicarbonate and sulphate ions are occasionally encountered. Based on geochemical indicators, these waters are identified as mixtures of ancient or modern infiltration waters with sedimentogenic thalassogenic waters. Indirect hydrogeochemical criteria for hydrocarbon potential in the Boryslav-Pokuttia area include: high Total Dissolved Solids (TDS) and waters metamorphization, their Na-Cl or Ca-Na-Cl composition, enrichment in trace elements and microcomponents, and low sulphate concentrations. Collectively, these features indicate a closed hydrodynamic system favourable for the formation and preservation of hydrocarbon accumulations.