Tag: reservoir rocks

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ASPECTS OF LITHOGENESIS OF OIL- AND GAS-BEARING MESOZOIC-CENOZOIC SEQUENCE OF THE CARPATHIAN REGION

Home > Archive > No. 1 (201) 2026 > 5–20

Geology & Geochemistry of Combustible Minerals No. 1 (201) 2026, 5–20

ISSN 0869-0774 (Print), ISSN 2786-8621 (Online)

https://doi.org/

Natalia RADKOVETSa, Yuriy KOLTUNb, Ihor POPPc, Marta MOROZd, Yuliia HAIEVSKAe, Halyna HAVRYSHKIV f, Petro MOROZg

Institute of Geology and Geochemistry of Combustible Minerals of the National Academy of Sciences of Ukraine, Lviv, Ukraine

a e-mail: radkov_n@ukr.net, https://orcid.org/0000-0002-1770-6996
b https://orcid.org/0000-0001-9884-5957
c https://orcid.org/0000-0002-7459-0037
d https://orcid.org/0009-0001-3695-2682
e https://orcid.org/0009-0006-8947-3913
f https://orcid.org/0009-0002-3376-8895
g https://orcid.org/0009-0007-5997-5768

Abstract

Although the Lower Cretaceous deposits of the northern slope of the Ukrainian Carpathians do not contain commercial hydrocarbon accumulations, but only individual oil and gas shows, the conducted studies have demonstrated that they remain a prospective object for further petroleum exploration. It has been established that in the sedimentary formations of the Upper Cretaceous, granular porous and mixed (pore-fractured) reservoirs with good filtration-capacity properties, associated with “Yamna-like” sandstones, are widespread. Mineralogical and petrographic studies of psammitic strata of the Paleocene and Eocene allowed us to study the features of their lithological and facial variability and to assess the patterns of distribution of these layers, both laterally and in the section within the Boryslav-Pokuttya and frontal nappes of the Skyba units of the Ukrainian Carpathians in terms of the prospects of their oil and gas bearing. The conducted reconstructions of the sedimentary environments of the Paleocene and Eocene flysch strata made it possible to establish the sources of terrigenous material entering the sedimentary basin. Lithological and geochemical studies of Oligocene sediments have allowed us to study the patterns of their facial variability, both in terms of the distribution of psammitic strata, which are reservoir rocks for oil and gas, and of the organic-rich Menilite beds. As studies have shown, the latter undergo significant changes in the direction from the Boryslav-Pokuttya and Skyba to the Krosno zone, changing not only the thickness and volume of oil and gas-generating rocks, but also their thermal maturity, and therefore the range of depths of oil and gas hydrocarbons generation zones. The Upper Jurassic sediments of the basement of the Outer zone of the Carpathian Foredeep represent one of the main oil and gas-bearing complexes of Western Ukraine. The conducted studies have allowed us to obtain new results regarding the patterns of distribution of different types of reservoir rocks within these strata.

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Keywords

Ukrainian Carpathians, Carpathian Foredeep, lithogenesis, facies, oil and gas generation potential, reservoir rocks

Referenses

Haievska, Yu. (2025). Litoloho-fatsialni ta mineraloho-petrohrafichni osoblyvosti vidkladiv eotsenu Ukraïnskykh Karpat. In Modern science: trends, challenges, solutions: proceedings of IV International scientific and practical conference (November 13–15, 2025) (pp. 329–338). Liverpool: Cognum Publishing House. https://sci-conf.com.ua/iv-mizhnarodna-naukovo-praktichna-konferentsiya-modern-science-trends-challenges-solutions-13-15-11-2025-liverpul-velikobritaniya-arhiv/ [in Ukrainian]

Havryshkiv, H. Ya., & Haievska, Yu. P. (2021). Fatsialni osoblyvosti paleotsen-eotsenovykh vidkladiv peredovykh skyb Skybovoi zony Ukrainskykh Karpat. Heolohiia i heokhimiia horiuchykh kopalyn, 3–4(185–186), 44–55. https://doi.org/10.15407/ggcm2021.03-04.044 [in Ukrainian]

Havryshkiv, H., & Radkovets, N. (2020). Paleocene deposits of the Ukrainian Carpathians: geological and petrographic characteristics, reservoir properties. Baltica, 33(2), 109–127. https://doi.org/10.5200/baltica.2020.2.1

Koltun, Y. V. (1992). Organic matter in Oligocene Menilite formation rocks of the Ukrainian Carpathians: palaeoenvironment and geochemical evolution. Organic Geochemistry, 18(4), 423–430. https://doi.org/10.1016/0146-6380(92)90105-7

Koltun, Yu. V. (2000). Heneratsiia vuhlevodniv u flishovykh vidkladakh Vnutrishnoi zony Peredkarpatskoho prohynu. Heolohiia i heokhimiia horiuchykh kopalyn, 4, 26–33. [in Ukrainian]

Kotarba, М. J., Bilkiewicz, E., Więcław, D., Radkovets, N. Y., Koltun, Y. V., Kowalski, A., Kmiecik, N., & Romanowski, T. (2020). Origin and migration of oil and natural gas in the central part of the Ukrainian outer Carpathians: Geochemical and geological approach. AAPG Bulletin, 104(6), 1323–1356. https://doi.org/10.1306/01222018165

Kotarba, М. J., Więcław, D., Bilkiewicz, E., Radkovets, N. Y., Koltun, Y. V., Kmiecik, N., Romanowski, T., & Kowalski, A. (2019). Origin and migration of oil and natural gas in the western part of the Ukrainian Outer Carpathians: Geochemical and geological approach. Marine and Petroleum Geology, 103, 596–619. https://doi.org/10.1016/j.marpetgeo.2019.02.018

Krupskyi, Yu. Z., Kurovets, I. M., Senkovskyi, Yu. M., Mykhailov, V. A., Chepil, P. M., Dryhant, D. M., Shlapinskyi, V. Ye., Koltun, Yu. V., Chepil, V. P., Kurovets, S. S., & Bodlak, V. P. (2014). Netradytsiini dzherela vuhlevodniv Ukrainy: Kn. 2. Zakhidnyi naftohazonosnyi rehion. Kyiv: Nika-Tsentr. [in Ukrainian]

Moroz, M. V. (2023). Litohenez verkhnoiurskykh vidkladiv Zovnishnoi zony Peredkarpatskoho prohynu. Heolohiia i heokhimiia horiuchykh kopalyn, 3–4(191–192), 105–121. https://doi.org/10.15407/ggcm2023.191-192.105 [in Ukrainian]

Popp, I., Havryshkiv, H., Haievska, Yu., Moroz, P., & Shapovalov, M. (2023). Evoliutsiia umov sedymentohenezu v karpatskomu flishovomu baseini v kreidi–paleoheni. Heolohiia i heokhimiia horiuchykh kopalyn, 3–4(191–192), 86–104. https://doi.org/10.15407/ggcm2023.191-192.086 [in Ukrainian]

Popp, I., Moroz, P., & Shapovalov, M. (2019). Litoloho-heokhimichni typy kreidovo-paleohenovykh vidkladiv Ukrainskykh Karpat ta umovy yikhnoho formuvannia. Heolohiia i heokhimiia horiuchykh kopalyn, 4(181), 116–133. https://doi.org/10.15407/ggcm2019.04.116 [in Ukrainian]

Popp, I., Shapovalov, M., & Moroz, P. (2018). Mineralohichnyi ta heokhimichnyi aspekt problemy slantsevoho hazu (na prykladi chornykh arhilitiv zakhodu Ukrainy). Mineralohichnyi zbirnyk, 1(68), 184–186. [in Ukrainian]

Senkovskyi, Yu. M., Hryhorchuk, K. H., Koltun, Yu. V., Hnidets, V. P., Radkovets, N. Ya., Popp, I. T., Moroz, M. V., Moroz, P. V., Rever, A. O., Haievska, Yu. P., Havryshkiv, H. Ya., Kokhan, O. M., & Koshil, L. B. (2018). Litohenez osadovykh kompleksiv okeanu Tetis. Karpato-Chornomorskyi sehment. Kyiv: Naukova dumka. [in Ukrainian]

Senkovskyi, Yu. M., Koltun, Yu. V., Hryhorchuk, K. H., Hnidets, V. P., Popp, I. T., & Radkovets, N. Ya. (2012). Bezkysnevi podii okeanu Tetis. Karpato-Chornomorskyi sehment. Kyiv: Naukova dumka. [in Ukrainian]

Received: January 12, 2026
Accepted: February 23, 2026
Published: April 2026

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LITHOLOGICAL AND FACIAL STRUCTURE AND PROSPECTS OF THE OIL AND GAS CAPACITY OF THE MIDDLE JURASSIC SEDIMENTS OF THE PREDOBROGEAN DEPRESSION

Home > Archive > No. 3–4 (195–196) 2024 > 24–35

Geology & Geochemistry of Combustible Minerals No. 3–4 (195–196) 2024, 24–35

https://doi.org/10.15407/ggcm2024.195-196.024

Kostyantyn HRIGORCHUK1, Volodymyr HNIDETS2, Oksana KOKHAN, Lina BALANDYUK

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: 1kosagri@ukr.net; 2vgnidets53@gmail.com

Abstract

The paper presents the results of complex lithogenetic studies of the Middle Jurassic deposits of the Predobrogean depression. The nature of the lithological-lithmological space-age variability of the Callovian and Bath-Bajocian deposits was established, lithophysical models were built on this basis, and the peculiarities of the development of reservoir rocks of various types and aquitards were clarified. In the lithological structure of the Middle Jurassic, three types of section are distinguished according to the ratio of rock components. It was established that the lithological structure of the Callovian and Bath-Bajocian deposits is significantly different: clayey, as well as siltstone-sand litmites are characteristic of the Bath-Bajocian, and mixed and terrigenous litmites with a carbonate component are characteristic of the Callovian. The lateral lithological and lithological heterogeneity of the sediments indicates that the studied profiles cross several facies zones. Two clastogenic packs of regional distribution were identified in the section of the Bath-Bajocian in the lower and middle parts of the section, 55–60 m and 50–240 m thick, respectively, separated by a pack of clay formations. The Callovian deposits are characterized by the development of mixed litmites, to a certain extent enriched in carbonate rocks. Three oil and gas promising areas have been localized. First, this is the district of Well Suvorivska-4, where the development of a combined (anticlinal and lithologically limited) trap is predicted in the Callovian deposits. Secondly, the area between Well Chervonoarmiyska-2 and Suvorivska-4, where 10 horizons of both pore and fracture reservoirs are wedged in the Bath-Bajocian deposits. The third is the district of Well Starotroyanivska-1, where there is a anticlinal trap with the development in the Bath-Bajocian deposits of two horizons of pore collectors, which are shielded by rather powerful aquitards.

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Keywords

deposits of the Middle Jurassic, litho-lithmological features, reservoir rocks, Predobrogean depression

Referenses

Belozerov, V. B. (2011). Rol sedimentatcionnykh modelei v elektrofatcialnom analize terrigennykh otlozhenii. Izvestiia Tomskogo politekhnicheskogo universiteta, 319(1), 116–123. [in Russian]

Dulub, V. G., Leshchukh, R. I., & Polukhtovich, B. M. (1985). K stratigrafii iurskikh otlozhenii Preddobrudzhskogo progiba. Geologicheskii zhurnal, 45(5), 74–79. [in Russian]

Hnidets, V. P., Hryhorchuk, K. H., Kokhan, O. M., Rever, A. O., & Balandiuk, L. V. (2023). Litohenez maikopskykh vidkladiv Prychornomorskoho mehaprohynu. Lviv. http://iggcm.org.ua/wp-content/uploads/2023/12/ЛІТОГЕНЕЗ-МАЙКОПСЬКИХ-ВІДКЛАДІВ.pdf [in Ukrainian]

Hnidets, V. P., Hryhorchuk, K. H., Kurovets, I. M., Kurovets, S. S., & Prykhodko, O. A. (2013). Heolohiia verkhnoi kreidy Prychornomorsko-Krymskoi naftohazonosnoi oblasti Ukrainy (heolohichna paleookeanohrafiia, litohenez, porody-kolektory i rezervuary vuhlevodniv, perspektyvy naftohazonosnosti). Lviv. [in Ukrainian]

Hnidets, V. P., Hryhorchuk, K. H., Pavliuk, M. I., Koshil, L. B., & Yakovenko, M. B. (2021). Litohenetychni peredumovy formuvannia rezervuariv i porid-kolektoriv u serednodevonskykh vidkladakh Skhidnosaratskoho rodovyshcha (Pereddobrudzkyi prohyn). Rozvidka ta rozrobka naftovykh i hazovykh rodovyshch, 3(80), 7–18. https://doi.org/10.31471/1993-9973-2021-3(80)-7-18 [in Ukrainian]

Leshchukh, R. Y., Permiakov, V. V., & Polukhtovych, B. M. (1999). Yurski vidklady pivdnia Ukrainy. Lviv: Yevrosvit. [in Ukrainian]

Lukin, O. Yu. (Vidp. vyk.). (2005). Naukove obgruntuvannia osvoiennia vuhlevodnevykh resursiv karbonatnykh formatsii Ukrainy: Vol. 2. Pivdennyi naftohazonosnyi rehion Ukrainy [Research report]. Chernihiv. [in Ukrainian]

Muromtcev, V. S. (1984). Elektrometricheskaia geologiia peschanykh tel litologicheskikh lovushek nefti i gaza. Leningrad: Nedra. [in Russian]

Naumenko, O. D., Korzhnev, P. M., Stryzhak, V. P., & Dezes, M. O. (2019). Prohnoz naftohazonosnosti seredno- ta verkhnoiurskykh karbonatnykh tovshch pivnichno-zakhidnoi chastyny Chornoho moria ta prylehloho sukhodolu za sedymentatsiino-paleoheomorfolohichnymy kryteriiamy. Heolohiia i korysni kopalyny Svitovoho okeanu, 15(2), 52–67. https://doi.org/10.15407/gpimo2019.02.052 [in Ukrainian]

Permiakov, V. V., Sapunov, I. G., Teslenko, Iu. V., & Chumachenko, P. V. (1986). Korreliatciia iurskikh otlozhenii chernomorskikh poberezhii Bolgarii i Ukrainy [Preprint]. Kiev: AN USSR, Institut geologicheskikh nauk. [in Russian]

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LITHOLOGICAL AND GEOCHEMICAL CHARACTERISTICS OF THE MIDDLE DEVONIAN STRATA OF THE LVIV DEPRESSION IN THE ASPECT OF THEIR OIL AND GAS BEARING PROSPECTS

Home > Archive > No. 3–4 (191–192) 2023 > 20–30

Geology & Geochemistry of Combustible Minerals No. 3–4 (191–192) 2023, 20–30

https://doi.org/10.15407/ggcm2023.191-192.020

Natalia RADKOVETS, Yuriy KOLTUN

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: radkov_n@ukr.net

Abstract

The Middle Devonian deposits within the Lviv Depression of the Volyn-Podillya plate are largely underexplored and are of great interest for further exploration for hydrocarbons. The presence of two discovered gas fields and the occurrence of granular and fractured reservoir rocks within the entire Lviv Depression point that the deposits of this age range are prospective for further exploration works for hydrocarbons. The authors conducted mineralogical and petrographic studies of these strata in order to study different types of reservoir rocks.

Petrographic studies of terrigenous rocks showed that the reservoir rocks are composed of fine-grained and medium-grained sandstones, as well as fine-grained and coarse-grained siltstones. The matrix in these rocks is contact-porous and contact, composed of dolomitized calcite (4–19 %) and hydromica (3–13 %). Regardless of the type of matrix, the pore space in rocks is formed by intergranular spaces of 0.05 to 0.5 mm size. Siltstone-sandstone deposits represent the granular-type reservoir rocks, the filtration properties of which are formed by the intergranular space, while fractures are of subordinate importance. Terrigenous rocks form gas-bearing horizons in Middle Devonian (Eiffelian and Zhivetian) in the Lokachi field of the Lviv Depression. Carbonate rocks are represented by a wide range of lithological types from slightly dolomitized biodetrital limestones to secondary dolomites. Dolomitization and recrystallization form fracture-like microcaverns with a size of up to 0.5 mm and result in a high porosity of up to 9 %. In carbonate reservoir rocks fracturing is prevailing, while porosity has a subordinate value.

Studies of the molecular composition of natural gases from reservoir rocks of the Middle Devonian of the Lokachi field showed that their predominant component is methane. Its content is 92.7–95.4 vol %. The rest of the methane homologues account for 1.45–2.16 vol %. The total share of non-hydrocarbon gases – nitrogen, carbon dioxide, helium and hydrogen are 3.102–5.082 vol %.

In order to clarify the origin of the Middle Devonian gases of the Lviv Depression, further studies of the carbon, nitrogen, and hydrogen isotopic composition of these gases and the study of the generation properties of the Lower and Middle Devonian rocks of the studied region are necessary.

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Keywords

Lviv Depression, Middle Devonian, reservoir rocks, mineralogical and petrographic composition of rocks, molecular composition of gases

Referenses

Chebanenko, I. I., Vishnyakov, I. B., Vlasov, B. I., & Volovnik, B. Ya. (1990). Geotektonika Volyno-Podolii. Kiev: Naukova dumka. [in Russian]

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Kiessling, W., Flügel, E., & Golonka, J. (2003). Patterns of Phanerozoic carbonate platform sedimentation. Lethaia, 36(3), 195–226. https://doi.org/10.1080/00241160310004648

Krupskyi, Yu. Z. (2001). Heodynamichni umovy formuvannia i naftohazonosnist Karpatskoho ta Volyno-Podilskoho rehioniv Ukrainy. Kyiv: UkrDHRI. [in Ukrainian]

Krupskyi, Yu. Z., Kurovets, I. M., Senkovskyi, Yu. M., Mykhailov, V. A., Kurovets, S. S., & Bodlak, V. P. (2014). Netradytsiini dzherela vuhlevodniv Ukrainy: Vol. 2. Zakhidnyi naftohazonosnyi rehion. Kyiv: Nika-Tsentr. [in Ukrainian]

Pomyanovskaya, G. M. (1974). Stratigrafiya devona Volyno-Podolskoy okrainy Vostochno-Evropeyskoy platformy. In Stratigrafiya USSR: Devon (pp. 7–14. 36–83). Kiev: Naukova dumka. [in Russian]

Radkovets, N., & Koltun, Y. (2022). Dynamics of sedimentation within the southwestern slope of the East European Platform in the Silurian-Early Devonian. Geodynamics, 1(32), 36–48. https://doi.org/10.23939/jgd2022.02.036

Radkovets, N., Kotarba, M., & Wójcik, K. (2017). Source rock geochemistry, petrography of reservoir horizons and origin of natural gas in the Devonian of the Lublin and Lviv basins (SE Poland and western Ukraine). Geological Quarterly, 61(3), 569–589. https://doi.org/10.7306/gq.1361

Rizun, B. P., Medvedev, A. P., & Chizh, E. I. (1976). Formatsii osadochnogo chekhla Volyno-Podolia. Litologiya i poleznyye iskopayemyye, 3, 85–92. [in Russian]

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