BITUMEN-OIL-AND-GAS DISTRICTING AND DIRECTIONS OF OIL AND GAS RESEARCHES IN UNCONVENTIONAL RESERVOIRS IN THE WESTERN REGIONS OF UKRAINE

Abstract

In connection with the humanity requirements growth in hydrocarbon fuels sources there is a need of more frequent conducting the exploration and search for oil and gas, not only in traditional reservoirs but also in shales and shale argillites which were earlier considered only as the overlay rocks. The above-mentioned issue stipulated the necessity of carrying out researches with the purpose of the oil-and-gas geological zoning, within the limits of oil-and-gas bearing areas. It is necessary for providing the next purposeful searches for oil and gas deposits, and also shale gas. Especially, it regards to the Westukrainian oil-and-gas bearing region, where there was the necessity of conducting oil-and-gas geological zoning, taking into account bituminous of lithologic-andstratigraphic section.
At present, to the basic perspective objects for the gas production in the Westukrainian bitumen-oil-and-gas bearing region, within the limits of it geosinclinal part we may consider the rock masses of menilite suite of Oligocene and spas suite of Low Cretaceous that are considerably enriched on the organic matter (ОM). And within the limits of platform part of the region, the Neogene strata of the Precarpathian Foredip Outer zone and Carboniferous deposits of the Lviv-Paleozoic Foredip, enriched on ОM. As for the blackshale strata of Low Paleozoic, then their perspective in gas-bearing relation causes a doubt, so as the deposits of Low Paleozoic contain very insignificant content of ОM, in the sections of these rocks as the transitions from swamp-lacustrine to the marine facies haven’t been determined yet. Besides in carrying out the exploration and search for shale gas in the Lublin Foredip in Poland there were no convincing positive results were obtained from this rocks. In the Transcarpathian Foredip of the Westukrainian region Neogene deposits are of great interest in the relation to further commercial gas content, as they are enriched not only on dispersibly dissipated humus ОM but also contain the layers of coal.