Harasymchuk V. Hydrogeological conditions of south-eastern part of the Precarpathian oil-gas-bearing region

The objects are water subbasins of the south-east part of the Precarpathian oil-gas-bearing area; the aims to determine the regularities of formation and preservation of oil and gas deposits and to substantiate the criteria of oil and gas presence based on hydrogeological sings; the methods are hydrogeochemical, gasohydrogeochemical, thermobaric and paleohydrogeological analyses, system analyses and synthesis; the new approach - systematization of water-bearing formation into water-bearing complexes was carried out, lateral and vertical hydrogeochemical and gas-hydrogeochemical zonality were detected, the presence of condensation-solution waters in productive horizons of the Lopushna oil field was determined, the role of oil and gas accumulation in the formation of hydrogeothermobaric fields was ascertained, underground water genesis and a time interval of the formation of hydrocarbon accumulation determined, the criteria of oil and gas presence were substantiated; the results - the studied geneses ofunderground waters allows us to appreciate the degree of significance of hydrogeological criteria of oil and gas presence, the determined regularities of formation and preservation of oil and gas deposits as well as the proposed hydrogeological criteria of oil and gas presence will promote increase in the efficiency of prospecting and exploring for oil and gas at deep horizons of the Inner Zone of the Precarpathian Foredeep; hydrogeochemical, gas-hydrogeochemical, geothermal and geobaric schemes are recommended to substantiate the technological parameters of the drilling and the testing in the boreholes; the field is Exploratory Oil and Gas Geology