OIL AND GAS RESERVOIRS IN SEDIMENTS OF THE CRETACEOUS AND PALEOGENE OF SKYBA ZONE OF THE UKRAINIAN CARPATHIANS (NORTH-WESTERN AND CENTRAL AREAS) AND THEIR OIL AND GAS PROSPECTS

• Main Authors: Shlapinskiy, V.Ye., Havryshkiv, H.Ya., Haievska, Yu.P.
• Format: Article
• Language: Ukrainian
• Published: Institute of Geological Sciences, NAS of Ukraine 2020
• Subjects: Скибовий покрив; стрийська світа; «ямнеподібні» пісковики; нафтогазоносність; перспективні ділянки; 553.98 (447.8); Скибовый покров; стрыйская свита; ямнеподобные песчаники; нефтегазоносность; перспективные участки; Skyba covering; Stryi Suit; Upper Stryi sub-suite; sandstones; oil and gas content; perspective areas
• Online Access: http://geojournal.igs-nas.org.ua/article/view/207341

The Carpathian oil and gas province is known as the oldest oil-producing region of Ukraine. The deposits of Cretaceous and Paleogene are known as oil and gas reservoirs of industrial development in the Skyba Zone. Statistics show that most of the oil was extracted from the Yamna sandstones of Paleocene. On the second place are the sandstones of Upper Cretaceous (Stryi Suite). The oil was produced at 17 fields in different years in the Folded Carpathians. In the published literature, references to them are scarce. Compared to typical sandstones of this Suite, which are characterized by low permeability, these sandstones generally have satisfactory reservoir properties. In the series cross-section, they are localized in several packages in the upper part which economic oil accumulations are asociated. Their potential is not exhausted. This article provides information about distribution and physical parameters of these rocks, as well as outlines perspective areas. The 4.2 million tons of oil were extracted from the sandstones of Yamna Suite of the Paleocene (85.7% of the total production), and 0.45 million tons (9.2%) from the “Yamna-like” sandstones of the Upper Stryi sub-suite of the Upper Cretaceous-Paleocene age. The 0.1 million tons (2.0%) and 0.15 million tons (3%) were extracted from sandstones of Eocene and Oligocene, respectively. The “Yamna-like” sandstones are characterized by satisfactory reservoir properties. They are widespread in the Skyba cover, especially in the advanced slices. The study of these objects is relevant because in addition to the known oil fields, there are promising areas with an opportunity to discover new fields. Studies of the oil and gas potential of the Skyba zone provide the grounds to believe that the sandstones of the upper part of the Stryi Suite are characterized as reservoirs for industrial production. The stratigraphic framework of their distribution is defined. A map of the thicknesses of the deposits of Upper Stryi in the north-western and central parts of the Skyba Zone has been compiled. Seismic surveys have identified promising objects in sections of the Stryi Suite in the northwestern part of the Skyba Zone.