Geoinformatika 2017; 2(62) : 5-13 (in Ukrainian)
STRUCTURAL GEOTHERMAL ATMO-HYDROLOGICAL-GEOCHEMICAL STUDIES OF THE TERRITORY OF THE BOBRIKIVSKA DEPRESSION
I.D. Bagriy1, Yu.K. Gordieieva1,2, V.A. Glon1, A.P. Kulish1,2, K.M. Starodubets1
1Institute of Geological Sciences, NAS of Ukraine, 55b, Honchar Str., Kyiv, 01054, Ukraine, e-mail: bagrid@ukr.net, u_gordeeva@mail.ru, vitaliyglon@gmail.com, kulish.andrii@gmail.com, starodubets.kirill@ukr.net
2Institute of Geology, Taras Shevchenko National University of Kyiv, 90, Vasylkivska Str., Kyiv, 03022, Ukraine
Purpose. The aim of the study was to carry out a comprehensive study and mapping of promising sites in search of hydrocarbons on the territory of the Bobrikivska depression by applying STAHGR technology. The main objectives of the work were the following: to construct conceptually new graphs based on the data obtained, to compare them with the available geological and geophysical data, and to identify promising areas for further searching for hydrocarbons.
Design/methodology/approach. The study is based on a comprehensive technology of structural and thermo-atmo-hydrological and geochemical research (STAHGR), which consists of the following structural and functional units: thermo-atmo-geochemical field studies including geothermic, radiometric studies and a soil vapor survey (for free hydrocarbons – methane, ethane, propane, butane, isobutane, ethylene, propylene, and also radon, thoron, helium, hydrogen, carbon dioxide). The purpose of this survey is to identify anomalies of hydrocarbons migrating from deposits of oil, gas and gas condensate. The main target of applying geochemical techniques on the land is the subsoil at the depth of 100-120 cm. The mapping feature is a spatial combination of background values of atmo-geochemical indicators and positive temperature anomalies delineated by gas and emanation maxima.
Findings. This was the first attempt ever to carry out a comprehensive study and mapping of promising sites in search of hydrocarbons within the Bobrikivska depression. We have conducted a comparison of available geological and geophysical data with the results of satellite image interpretation; we have constructed radon, thoron, helium, hydrogen, carbon dioxide, methane, and its homologues and temperature distribution maps. We have made a comparison of the obtained atmo-geochemical parameters with the geological structure of the studied area, which results in a better understanding of the geological structure and geodynamic processes of the territory under investigation.
Practical value/implications. We have defined the prospects of searching for hydrocarbon deposits within the edges and near edge zones of the Bobrikivska depression. It is estimated that there are a non-anticlinal hydrocarbon traps within the northern edge. The results of the investigation confirm the high potential of the Bobrikivska depression and can be used as reference in studying other depressions of the Dnieper-Donets Basin.
Keywords: the Bobrikivska depression, petroleum prospects, oil and gas potential indicators, anomalies.
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