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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.

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]

Serhii, H. B., & Postnikova, N. M. (2014). Utochnennia heolohichnoi budovy perspektyvnykh vidkladiv Biloliskoho bloka Pereddobrudzkoho prohynu na osnovi pohlyblenoi obrobky ta interpretatsii danykh seismorozvidky [Research report]. Kyiv: PrAT NVK “Ukrnaftinvest”. [in Ukrainian]

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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PROSPECTS OF DISCOVERY OF GAS DEPOSITS AT SHALLY DEPTHS IN THE EAST OF THE DNIPRO-DONETS BASIN OF UKRAINE

Home > Archive > No. 1–2 (189–190) 2023 > 5–16


Geology & Geochemistry of Combustible Minerals No. 1–2 (189–190) 2023, 5–16

https://doi.org/10.15407/ggcm2023.189-190.005

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 object of research was the Ustynivka area, which is located in the north-eastern part of the Dnipro-Donets basin on the border between the northern board and axial part of the region.

The geological structure of the area is illuminated from positions of gravitational tectogenesis. Two echelons of brachianticlinal uplifts, genetically related to the Krasnoritsk and Muratove-Tuba discharges, have been identified in the Carboniferous deposits. They were formed in nonconsolidated strata under conditions of stretching and rapid lowering of the Dnipro-Donets graben. Seismic surveys have revealed seven anticlines. Their feature is the orientation of structures along arcuate tectonic faults, asymmetry and displacement of anticlines with a depth to the southwest. According to the geomorphological features of the river valley of the Siverskyi Donets, a new uplift is predicted in the lowered block of the Tuba fault.

In the Voronove anticline, three gas deposits have been established in the Bashkirian stratum. Nearby are Borivske, Muratove, Yevgeniivka, Krasnopopivka and other gas-condensate fields. Therefore, the gravigenic structures of the Ustynivka area are promising for the discovery of new deposits. Promising horizons of the Bashkirian stratum are at shallow depths: from 2 to 2.5 km. Our estimated gas reserves and resources of the Ustynivka area are 262 and 2100 million m3, respectively.

Recommendations are given to clarify the form of gravigenic tectonic faults and related anticlines. The tasks for detailed seismic surveys and drilling are defined. The location of exploration and prospecting boreholes is proposed. Considering the displacement of the vaults of gravigenic structures with depth, to open the productive stratum in the apical parts of the uplifts, we recommend drilling inclined boreholes in the southwestern direction. Tasks for industrial development of deposits of Voronove structure are defined.

Keywords

gas-bearing prospects, Dnipro-Donets basin, gravitational structures, oil and gas traps, hydrocarbon reserves

Referenses

Babadagly, V. A., Lazaruk, Ya. G., Kucheruk, E. V., & Kelbas, B. I. (1981). Osobennosti geologicheskogo stroyeniya zony melkoy skladchatosti Severnogo Donbassa. Geologiya nefti i gaza, 1, 34–39. [in Russian]

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Lazaruk, Ya. H., & Kreidenkov, V. H. (1995). Novyi typ pastok vuhlevodniv u vidkladakh karbonu Dniprovsko-Donetskoi zapadyny. Mineralni resursy Ukrainy, 3–4, 42–46. [in Ukrainian]

Lukin, O. (2008). Vuhlevodnevyi potentsial nadr Ukrainy ta osnovni napriamy yoho osvoiennia. Visnyk Natsionalnoi akademii nauk Ukrainy, 4, 56–67. [in Ukrainian]

Myroshnychenko, R., Polokhov, V., & Borodulin, Ye. (2018). Zvit pro rezultaty seismorozviduvalnykh robit 2D na Ustynivskii diliantsi Sievierodonetskoi ploshchi. Prydniprovska heofizychna rozviduvalna ekspedytsiia DHP “Ukrheofizyka”. Novomoskovsk. [in Ukrainian]

Prior, D. B., & Coleman, J. M. (1982). Active slides and flows in underconsolidated marine sediments on the slopes of the Mississippi delta. In S. Saxov & J. K. Nieuwenhuis (Eds.), Marine slides and other mass movements (pp. 21–49). New York: Plenum press. https://doi.org/10.1007/978-1-4613-3362-3_3

Rudko H. I., Liakhu, M. V., Lovyniukov, V. I., Bahniuk, M. M., & Hryhil, V. H. (2016). Pidrakhunok zapasiv nafty i hazu. Kyiv: Bukrek. [in Ukrainian]

Somin, O., Aksonov, V., & Pysmennyi, I. (2016). Utochnenyi proiekt promyslovoi rozrobky Borivskoho hazokondensatnoho rodovyshcha [Research report]. UkrNDIHaz PAT “Ukrhazvydobuvannia”. Kharkiv. [in Ukrainian]

Tovstiuk, Z. M., Yefimenko, T. A., & Titarenko, O. V. (2014). Novitnia rozlomno-blokova tektonika Dniprovsko-Donetskoi zapadyny. Ukrainskyi zhurnal dystantsiinoho zonduvannia Zemli, 2, 4–13. [in Ukrainian]