Tag: deposit

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PROSPECTS FOR OIL AND GAS PRESENCE IN CARBONATE DEPOSITS OF SILURIAN AGE IN THE BEREZHANY-BUCHACH ZONE OF TECTONIC DISLOCATIONS OF VOLYN-PODILLIA AREA

Home > Archive > No. 1–2 (193–194) 2024 > 50–68

Geology & Geochemistry of Combustible Minerals No. 1–2 (193–194) 2024, 50–68

https://doi.org/10.15407/ggcm2024.193-194.050

Svitlana HARASYM, Yaroslav LAZARUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: igggk@mail.lviv.ua

Abstract

The Berezhany-Buchach zone of local uplifts belongs to the Podillia promising district, located in the southern part of the Volyn-Podillia oil and gas region. Most of the local structures of the district are genetically related to tectonic disturbances. The structuring factor of the Berezhany-Buchach zone of tectonic dislocations is a fault of subregional extension, probably of a reverse-thrust character. Organogenic structures of the Silurian age are spatially connected with it. According to the results of lithologic-facies studies, they were deposited in lagoon-shelf conditions in a narrow strip 15–40 km wide, which stretches from the border with Romania in the southeast to the border with Poland in the northwest. According to the predominance of the remains of organisms, coral, stromatopore, crinoid, ostracod, brachiopod and algal species are distinguished among carbonates. They are recrystallized as a result of epigenetic processes. The reservoir rocks are composed of silty-detrital limestones, dolomitized limestones, and dolomites. There are both porous and cavernous, as well as fissure-pore and fissure-cavern collectors. Primary porosity is caused by voids inside and between organisms, and secondary capacity is caused by recrystallization, dolomitization, leaching, cavernous and fissure formation. The open porosity of carbonates varies on average from 4 to 16 %, permeability – from 0.01 to 2 mD. In the southeastern direction, the collector properties of carbonates deteriorate. Industrial deposits of hydrocarbons in the Silurian carbonates of Volyn-Podillia have not been established, however, numerous oil and gas occurrences were recorded during drilling. Based on the materials of lithologic and facies studies, the results of studying the reservoir properties of reservoir rocks, seismological and magnetometric constructions, and data from surface geochemical studies, the probable Berezhany, Dobrovoda, and Buchach objects were identified, their resource base was estimated at 48.6 million tons of oil and 1.3 billion m3 of dissolved gas, and the tasks for 3D seismic exploration were substantiated for the purpose of preparing the mentioned objects for exploratory drilling for oil and gas.

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Keywords

oil, deposit, oil traps, carbonate reservoir, hydrocarbon reserves

Referenses

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OPTIMIZATION DIRECTIONS OF EXPLORATION AND DEVELOPMENT OF OIL FIELDS OF THE WESTERN FORE-BLACK SEA AREA OF UKRAINE

Home > Archive > No. 3–4 (191–192) 2023 > 7–19

Geology & Geochemistry of Combustible Minerals No. 3–4 (191–192) 2023, 7–19

https://doi.org/10.15407/ggcm2023.191-192.007

Yaroslav LAZARUK, Myroslav PAVLYUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: igggk@mail.lviv.ua

Abstract

The southern part of the Dobrogea Foredeep is located in the southwestern regions of Ukraine within the Odesa region. Here, on the territory of the uplifted Bilolissya block, the East Sarata, Zhovtyjar, Saryjar, Zarichna oil accumulations are located in the chemogenic-carbonate layer of the Middle and Upper Devonian. The deposits are confined to limestones and dolomites with secondary fractured-cavernous-porous reservoirs. They lie at depths of 2500–3200 m. During the test of two dozen wells, the filtrate of the drilling fluid with a small amount of oil was received with the estimated flow rates of several tons per day. The rise of the oil level in the wells was quickly stopped, the hydrodynamic connection of the wells with the productive formations was lost. The use of today’s known methods of intensification of the flow of hydrocarbon fluids did not lead to positive results. According to the research of microphotographs of reservoir rocks, it is proved that the largest voids of reservoir rocks are filled with immobile bitumen, while the smaller cavities contain mobile oil. Immobile bitumen fills main channels and blocks communication between rock cavities. This is the main reason for the absence of industrial inflows of oil to the wells. Another important reason is the low filtering properties of the collectors. Most of them have a permeability of less than 0.01∙μD. Other reasons for the failure of the industrial development of oil deposits are the high dynamic viscosity of oil due to the high content of asphaltenes, silicagel resins, paraffins, the low energy potential of oil deposits due to their degassing during the long geological time, as well as the lack of hydrodynamic connection of oil deposits with natural water pressure systems. We assume that the Middle and Upper Devonian oil fields of the Western Fore-Black Sea area are most likely mainly bituminous. Given the significant depths of the deposits, their industrial development is technically impossible today. Therefore, it is impractical to plan further scientific research on the mentioned complex. Instead, research should be reoriented to the Silurian terrigenous-carbonate complex and the Lower Devonian terrigenous complex, which are hydrodynamically more closed and in which non-degassed hydrocarbon accumulations can be preserved.

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Keywords

oil, bitumen, deposit, oil traps, carbonate reservoir, terrigenous complex, hydrocarbon reserves, exploration and development of deposits

Referenses

Hnidets, V. P., Hryhorchuk, K. H., Polukhtovych, B. M., & Fedyshyn, V. O. (2003). Litohenez devonskykh vidkladiv Prydobrudzkoho prohynu (paleookeanohrafiia, sedymentatsiina tsyklichnist, formuvannia porid-kolektoriv). Kyiv: UkrDHRI. [in Ukrainian]

Lazaruk, Ya. H., Melnyk, A. Yu., Vasylyna, R. M., & Sheremet, B. B. (2017a). Heoloho-ekonomichna otsinka Skhidnosaratskoho naftovoho rodovyshcha Odeskoi oblasti [Research report]. Kyiv: PrAT NVK “Ukrnaftinvest”. [in Ukrainian]

Lazaruk, Ya. H., Melnyk, A. Yu., Vasylyna, R. M., & Sheremet, B. B. (2017b). Heoloho-ekonomichna otsinka Zhovtoiarskoho naftovoho rodovyshcha Odeskoi oblasti [Research report]. Kyiv: PrAT NVK “Ukrnaftinvest”. [in Ukrainian]

Pavliuk, M. I. (2014). Heodynamichna evoliutsiia ta naftohazonosnist Azovo-Chornomorskoho i Barentsovomorskoho perykontynentalnykh shelfiv. Lviv: Proman. [in Ukrainian]

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Trokhymenko, H. L. (2013). Osoblyvosti pryrodnykh rezervuariv vuhlevodniv u potuzhnykh karbonatnykh kompleksakh. Geologiya i poleznyye iskopayemyye Mirovogo okeana, 4, 46–62. [in Ukrainian]

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METHODICAL ASPECTS OF FORECASTING OF COMPOUND-BUILT RESERVOIR ROCKS (ON THE EXAMPLE OF SEMYRENKIVSKYI OIL AND GAS CONDENSATE DEPOSITS OF DNIEPER-DONETS BASIN)

Home > Archive > No. 3-4 (172-173) 2017 > 29-40

Geology & Geochemistry of Combustible Minerals No. 3-4 (172-173) 2017, 29-40.

Ivan GAFICH1, Yaroslav LAZARUK2, Igor SCHUROV3

1 DTEK Oil&Gas, Kyiv, e-mail: GafichIP@dtek.com
2 Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, e-mail: lazaruk_s@i.ua
3 DTEK Oil&Gas, Kyiv, e-mail: SchurovIV@ngv.com.ua

Abstract

The complex of geological and geophysical studies for predicting reservoir rocks of oil and gas fields has been suggested. For this purpose, structure-paleogeomorphological, lithofacial, borehole geophysical and seismic studies related to a particular algorithm of work are used. Practical application of complex of mentioned methods has been demonstrated on the example of Semyrenkivskyi oil and gas condensate deposits of Dnieper-Donets basin. The prediction results of reservoir rocks have been demonstrated. They are supposed to be used for selection the optimal allocation of operation, test and prospecting boreholes.

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Keywords

reservoir, lithofacies, paleogeomorphology, oil and gas, deposit.

Referenses

Lazaruk, Ya. (2006). Theoretical aspects and methods of finding of hydrocarbon deposits in non-anticlinal traps (for example, deposits of ХІІа microfaunal horizon of Dnieper-Donets basin). Kyiv: UkrDGRI.