Sedimentary sequence of south-western slope of the East-European platform has been covered by lithological and lithological-geochemical investigations, including such geostructural units as Volyn-Podillya plate, Moldovian platform and Dobrogea foredeep. On the base of paleoenvironmental analysis the reconstruction of depositional environments during Ediacaran-Early Paleozoic within the south-western margin of the paleo-continent Baltica has been performed and corresponding facial sketch maps have been constructed. Correlation of Upper Proterozoic and Paleozoic deposits of Baltic, Lublin-Podlasie, Volyn-Podillya and Fore-Dobrougean paleo-basins showed, that the represented in the present-day sequence structural-tectonic complexes of different age, which in turn represent different depositional cycles, have been formed in one common basin of the continental margin of paleo-continent Baltica.
Using the up-to-date precision methods the black shale sequences of Ediacaran, Silurian, Middle-Upper Devonian and Lower Cretaceous, as well as oil and gas samples from Middle Devonian and Mesozoic reservoirs have been investigated. In particular, have been performed the studies of the material composition of both prospective oil-gas-generating sequences and reservoir rocks, analyses of organic matter for estimating its type, maturation level and hydrocarbon-generative potential, investigations of oils from the existing accumulations with a purpose of obtaining their genetic characteristics, analyses of gas from the existing accumulations in order to study the processes, which led to their formation, correlation between oils, gases and organic-rich rocks, study of the possibility of oil and gas accumulations’ existence within the investigated lithological-stratigraphic complexes.
On the base of the obtained results of investigations has been performed the computer modeling of tectonic evolution and subsidence and maturation history of the Upper Proterozoic-Phanerozoic sedimentary sequence of south-western slope of the East-European platform and the related formation of oil and gas potential of separate lithological-stratigraphic complexes. Results of 1-D modeling of subsidence and maturation history, performed for potential hydrocarbon-generating rocks of the Upper Proterozoic-Phanerozoic sequence of the study area, showed that in most cases they have reached the maturation level, corresponding to oil and gas windows within the time span from Late Silurian to Late Carboniferous. The process of thermal maturation has been terminated by the Late Carboniferous inversion and uplift.
Key words: Volyn-Podillya Plate, Dobrogea Foredeep, Ediacaran, Paleozoic, Mesozoic, material composition of rocks, paleoenvironments, facies, organic matter, generative potential, thermal maturity of rocks, computer modeling.
