Tag: sedimentation conditions

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DEPRESSION SEDIMENTS OF THE UPPER JURASSIC – LOWER CRETACEOUS CARBONATE COMPLEX IN UKRAINIAN PRECARPATHIANS

Home > Archive > No. 2 (202) 2026 > 46–61

Geology & Geochemistry of Combustible Minerals No. 2 (202) 2026, 46–61

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

https://doi.org/10.15407/ggcm2026.202.046

Natalia ZHABINA1, Olena ANIKEYEVA2

1 Institute of Geological Sciences of the National Academy of Sciences of Ukraine, Kyiv, Ukraine

e-mail: zhabinanatalia@gmail.com, https://orcid.org/0000-0003-2759-2010

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

e-mail: geolena@ukr.net, https://orcid.org/0000-0001-8177-4304

Abstract

In the western part of Upper Jurassic – Lower Cretaceous carbonate complex of Ukrainian Precarpathians, are the depression sediments, represented by open shelf deposits and reef destruction products. They were opened by wells in area adjacent to the Krakovets fault, their recorded length reaches 100 km. Numerous oil-shows and small deposits are known in the upper part.

Since the depressional formations of the Upper Jurassic are promising for hydrocarbons, detailed comprehensive studies are a necessary prerequisite for the effectiveness of further geological work. A detailed characteristic of these sediments is also necessary for regional and interregional correlation.

Based on the analysis and comparison of a complex of published data and the results of our microfaunal and microfacies studies, the structure and composition of depression formations of the Upper Jurassic – Lower Cretaceous carbonate complex in Ukrainian Precarpathians have been clarified. They consist of the forereef facies of Oxfordian (Boniv suite), Kimmerigian (Morantsy suite), Tithonian – Lower Berriasian (Lower subsuite of Carolina suite) and the open-marine formations of Upper Berriasian – Early Valanginian. (Upper subsuite of Carolina suite). These deposits extend in a narrow strip along the Krakovets fault and with regional erosion are covered by Neogene sediments. The full section of depression sediments has been opened by five wells. A detailed lithological and paleontological characteristic of these sediments at the macro- and microscopic levels is provided, zoning by foraminifera and tintinnids is characterized, correlative microfacies with planktonic microorganisms are determined.

The occurrence of depression deposits is prognosed under the thrust structures of the Carpathians. It expands the prospects of oil and gas potential of the region and needs further comprehensive research by various geological and geophysical methods.

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Keywords

Upper Jurassic – Lower Cretaceous, depression deposits, lithological and paleontological composition, sedimentation conditions, Ukrainian Precarpathians

Referenses

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Received: April 18, 2026
Accepted: April 28, 2026
Published: May 29, 2026

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LITHOLOGY AND SEDIMENTATION CONDITIONS OF PALEOCENE DEPOSITS OF THE SOUTH SLOPE OF THE KARKINITE DEPRESSION (BLACK SEA COAST)

Home > Archive > No. 1–2 (187–188) 2022 > 71–81

Geology & Geochemistry of Combustible Minerals No. 1–2 (187–188) 2022, 71–81.

https://doi.org/10.15407/ggcm2022.01-02.071

Kostyantyn HRYGORCHUK1, Volodymyr HNIDETS2, 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

According to the results of lithological studies of the Paleocene sediments of the southern side of the Karkinite Depression, the lateral lithological-lithmological and facial variability of the sediments is characterized, which is manifested both in the whole section of the Paleocene and its individual epochs. It is shown that the role of limestone formations clearly decreases from the beginning to the end of the period with their maximum development in Zealand time. Sediments of the Tanetian epoch are characterized by dominance in the section of marl-clay formations and the development of siltstone-sand bodies in the area of the Odesa structure. Sediments are represented by three types of section: terrigenous (well Odeska-2), carbonate (wells Hamburtseva-2, Selskogo-40), carbonate-clay (wells Crimean-1, Shtormova-5, Centralna-1, Arkhangelskogo-1). In different areas, each type of section is characterized by a certain specificity of the internal structure. Lithological heterogeneity of sediments is associated with spatial and age variability of biofacial zones: biogerms, inland biogerm lagoons, plumes of destruction of bioherms, the outer shelf. In the sediments of the Danian age, small limestone bodies are localized in the Shtormova and Odesa structures. Zealand strata in the area from well Hamburtseva-2 to well Centralna-1 are characterized by significant development of bioherms, which are replaced in the direction of the Odesa structure by plumes of destruction and sediments of basin plains. The development of bioherm formations in the axial part of the depression is predicted, which is associated with the sedimentary manifestation of the Central Mikhailovsky uplift. This significantly expands the prospects for oil and gas in this part of the study area. During the Tanetian period, rising sea levels caused an increase in the area of distribution of the outer shelf in the axial zone of depression. At the same time, in the area of the structures of Hamburtseva, Selskogo, Centralna inheritedly (despite the transgression) were developed biohermic massifs, which was caused by upward movements within the Black Sea-Kalamitsky uplift.

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Keywords

lithology, facies, sedimentation conditions, Paleocene, Karkinite Depression

Referenses

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