PROSPECTS OF SEARCHES AND PROBLEMS OF GAS DEVELOPMENT OF SEALED COLLECTORS OF THE DNIPRO-DONETSK DEPRESSION

Abstract

The article considers the current problem of the hydrocarbon base of Ukraine. Materials that can serve as prerequisites for exploration and further development of gas from compacted reservoirs on the territory of the Dnieper-Donetsk graben are analyzed. In this article, the main parameters, that indicate the presence of gas in compacted reservoirs, are briefly considered. The data contain information about the features of the sedimentary section of the Paleozoic complex, namely, the geological structure of promising areas, the degree of catagenesis of gas-bearing rocks, the content of organic carbon in parent rocks, reservoir properties, and depths of gas-promising intervals. These data, taken from the results of drilling numerous wells, indicate a high probability of successful exploration for central basin gas within the axial zone of the Dnieper-Donetsk basin. As such deposits are difficult to extract, due to the complex geological structure of promising areas, a wide range of depths and, above all, poor reservoir properties of rocks containing gas, its development is impossible without the use of intensification methods. There are many chemical, thermal, mechanical technologies to cause the inflow of fluid from the reservoir, among which the hydraulic fracturing of the reservoir has become widespread. Modern methods of intensification are quite effective, but still remain imperfect, and therefore, there are some defects that cause certain complications in the development of the deposit. Тo cause the inflow of hydrocarbons from the compacted reservoirs, a foam gap of the formation is indicated, the use of which, in the opinion of the authors, is appropriate for deposits of this type. The article also points out the advantages of using a foam system compared to conventional fracturing and the need to improve some indicators of the foam system to its further use for compacted terrigenous reservoirs of the Dnieper-Donetsk avlakogen.