Tag: facies

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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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FACIAL FEATURES OF THE PALEOCENE-EOCENE DEPOSITS OF ADVANCED UNITS OF THE SKYBA ZONE OF UKRAINIAN CARPATHIANS

Home > Archive > No. 3–4 (185–186) 2021 > 44–55

Geology & Geochemistry of Combustible Minerals No. 3–4 (185–186) 2021, 44–55.

https://doi.org/10.15407/ggcm2021.03-04.044

Halyna HAVRYSHKIV1, Yuliya HAIEVSKA2

1, 2 Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: 1galinah2404@gmail.com; 2yuhaievska@ukr.net

Abstract

There three main types of facies of Paleocene-Eocene complexes: sandy, siltstone and argillite distinguished within the study area by the nature of the distribution of the strata of the forming components were highlighted. Тhey accumulated avalanche at the foot of the continental slope and formed various facial parts of the foehn (Upper, Middle and Lower foehn). In the upper part of the Foehn was accumulated coarse-grained sediments (clusters of deep boulders and other psephyto-psammitic material containing edaphogenic rocks). Under the action of geostrophic and bottom currents, silt streams of pelitic and psammitic material moved in the direction to the south and south-east of the Carpathian sedimentation basin, forming sandy-clay and clay facies (Middle and Lower foehn). During the turbidite movement of a large amount of sediment from the first (shelf) to the second (foot of the continental slope) level of avalanche sedimentation, sorting and distribution of sediments on the continental slope took place. Based on the analysis of the material composition of Paleocene-Eocene sediments of the study area by such criteria as the size of the fragment, sedimentary textures and the ratio of different rocks, 7 facies were identified, which were deposited as gravitational flows down on the continental slope. Reconstructions of Paleocene-Eocene age flysch deposits showed that terrigene material in the studied sedimentation basin came from two sources – one of which was northwest of the study area and was characterized by a predominance of coarse-grained sandy sediments, while the source wear, which was in the central part of the studied basin was characterized by a predominance of clay silt and fine-grained psammitic material. This nature of the distribution of terrigenous material had a decisive influence on the further formation of Paleocene end Eocene sedimentary strata in the process of sedimentogenesis and post-sedimentary transformations of sediments, and on the formation of reservoir rocks and rocks with potential reservoir properties for hydrocarbon exploration. It has been established that the composition of the Psamitolites of the flysch formation of the Paleocene and Eocene ages of the Carpathians was formed on the passive continental margin or in the inland and boundary seas, and their genesis mostly corresponds only to the platform source of material wear.

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Keywords

Paleocene, Eocene, facies, sandstone, flysch, continental slope, sedimentation

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