NEW DATA ON PROMISING OIL AND GAS OBJECTS OF THE YAMNA SUITE OF THE PALEOCENE IN THE SOUTH-EASTERN PART OF THE SKІBA AND KROSNO COVERS OF THE UKRAINIAN CARPATHIANS

• Дата: 2023
• Автори: Шлапінський, В.Є., Гавришків, Г.Я., Гаєвська, Ю.П.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: Institute of Geological Sciences, NAS of Ukraine 2023
• Теми: Yamna sandstones; Skіba and Krosnо covers; reservoirs; prospects of oil and gas potential; Voronenka structure; ямненські пісковики; Скибовий і Кросненський покриви; колектори; перспективи нафтогазоносності; структура Вороне
• Онлайн доступ: http://geojournal.igs-nas.org.ua/article/view/268990
• Назва журналу: Geological journal

Thick sandstones of the Yamna suite are widespread throughout the Skіba cover, as well as in the south-eastern part of the Krosno cover. The research area is bounded by the Limnytsia River in the northwest and the Ukrainian-Romanian border in the southeast. Several promising structures comprising the Yamna sandstones (Brusturanska, Yanovetska, and Voronenkivska) are identified in this area. Among them, according to the number of positive indicators of oil and gas potential, the Voronenkivska structure (Nadvirna district of Ivano-Frankivsk region, near the settlements of Voronenka, Yablunytsya, Polyanytsya) is the most promising, localized in the Zelemyanka slice. The structure is divided by faults into four tectonic blocks and stretches for 8 km. Under the Oligocene rocks, crumpled into the anticlinal fold of the north-western extension, Paleocene-Eocene deposits are inferred according to the geological models, which contain thick sand strata of the Vyhoda (Middle Eocene) and Yamna suites of the total thickness over 300 m. Oil manifestations are documented in the Oligocene deposits on the surface. Potentially promising horizons may be in the depths range 1500-1800 m. The article extends the previous work devoted to the assessment of the oil and gas prospects of the Yamna suite of the Paleocene of the north-western part of the Skуba cover of the Ukrainian Carpathians. 4.2 million tons of oil were recovered from the Yamna sandstones of the Paleocene, which are characterized by good reservoir properties, in the fields localized in the north-western part of the Skiba cover. The Yamna sandstones in this sector of the Carpathians are also common in the Krosno cover. The uneven distribution of industrial oil potential between these two parts of the Carpathians is explained by lithological changes or the influence of structural and geochemical factors. A study of stratigraphy and reservoir properties of the Yamna sandstones, common in the deposits of the Skіba and Krosno covers, suggests that they comprise satisfactory reservoirs for hydrocarbons. Promising areas and structures have been identified and described.