Kabyshev Y. The peculiarities of gas generation of a central-basin type and evaluation of its accumulations in the Dnieper-Donets Basin

The regularities of HC generation in the DDB and the prognosis for the central-basin (CB) gas accumulations on their basis (with due consideration of the data on North America oil/gas basins where such a gas is explored and developed) are highlighted in this work. It has been systematized the criteria to identify CB gas in North American sedimentary basins and the differences when applying them to the DDB conditions. Using the modern geochemical studies made for the first time in Ukraine (biomarkers, pyrolysis technique by Rock-Eval, isotopic correlation) one has to come to a conclusion about the HC sources in the DDB. A new criterion (a few-water section) to assess HC perspectives of the DDB for CB gas has been applied. By means of integration of geological map sets for 5, 6 and 7 km depth it was compiled for the first time a map of hypsometric level of the low-water-saturated zone has, which allow the map to assess the DDB perspectives for CB gas to compile. The prospective complexes and zones are recognized for the Eastern and Central parts of the DDB in particular. The technique for quantitative assessment the potential of CB gas resources has been established. On its basis (for the first time in CIS countries) a CB gas resources have been estimated for Serpukhovian complex of 1410 Bln.m3 by the author's calculations. This is in 3.1 time more than initial estimation of gas resources and in 5.35 time more than their undiscovered part. It was distinguished 3 most promising local prospects (with resource potential of 201-300 Mln.m3/km2) in the Oktyabrsk-Lozovaya and Kalmius-Bakhmut zones, and Blyznuyki homocline as well, which are recommended for the further study.