Oil and Gas Geology – Page 4 – Geology and Geochemistry of Combustible Minerals

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TECTONIC-SEDIMENTARY EVOLUTION OF THE FRONTAL PART OF THE UKRAINIAN CARPATHIAN NAPPE STRUCTURE

Home > Archive > No. 1–2 (183–184) 2021 > 45–59

Geology & Geochemistry of Combustible Minerals No. 1–2 (183–184) 2021, 45–59.

https://doi.org/10.15407/ggcm2021.01-02.045

Oleh HNYLKO, Svitlana HNYLKO, Maria KULYANDA, Romana MARCHENKO
Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, e-mail: igggk@mail.lviv.ua

Abstract

For the first time in the Ukrainian Carpathians, the depths and tectono-sedimentation processes in the north-eastern part of the Outer Carpathian Basin (Skyba and Boryslav-Pokuttya units) have been restored on the base of sedimentological and microfaunistic studies. It was established that in the Cretaceous-Eocene time, the deep-water (near Calcite Compensation Depth) turbidite and similar sedimentation (turbidites with Bouma textures, grainites, debris-flow deposits), which periodically alternated with (hemi)pelagic sedimentation (red, green and black shales) was dominant here. Sedimentation took place on the continental margin of the the Carpathian branch of the Tethys, where deep-water fans were formed. Cretaceous-Eocene background red and green shales are enriched in buried in situ benthic foraminifera which are similar in taxonomic composition and morphological features to the microfauna of the Carpathian-Alpine and Atlantic regions (deep-water agglutinated foraminifera), which indicate lower bathyal – abyssal depths of flysch sedimentation. Latest Eocene Globigerina Marl horizon contains the foraminiferal assemblage with plankton dominance, which indicates a general shallowing of the Outer Carpathian Basin (middle-upper bathyal conditions above a calcite compensation depth). Oligocene – lowermost Miocene Menilite-Krosno and Polyanytsia formations were accumulated in the Skyba and Boryslav-Pokuttya sub-basins. In the Miocene, shallow-water molasses were accumulated here. Probably, the tectonic uproot of flysch deposits from its substrate and their synsedymentary thrusting towards the platform caused a significant shallowing of the Skyba and Boryslav-Pokuttya sub-basins starting from the latest Eocene. These processes reflected the growth of the Carpathian frontal nappes at the final orogen formation stage.

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Keywords

Ukrainian Carpathians, Skyba and Boryslav-Pokuttya nappes, foraminifera, turbidites

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Posted on June 2021November 2021 by GGCMJournal

DYNAMICS OF LITHOGENESIS OF PHANEROZOIC SEDIMENTARY SEQUENCE OF THE CARPATHIAN-BLACK SEA REGION IN THE ASPECT OF THEIR OIL- AND GAS-BEARING POTENTIAL

Home > Archive > No. 1–2 (183–184) 2021 > 60–75

Geology & Geochemistry of Combustible Minerals No. 1–2 (183–184) 2021, 60–75.

https://doi.org/10.15407/ggcm2021.01-02.060

Nataliya RADKOVETS, Kostyantyn HRYGORCHUK, Yuriy KOLTUN, Volodymyr HNIDETS, Ihor POPP, Marta MOROZ, Yuliya HAYEVSKA, Halyna HAVRYSHKIV, Oksana KOKHAN, Oksana CHEREMISSKA, Petro MOROZ, Lesya KOSHIL, Lina BALANDYUK, Mykhaylo SHAPOVALOV, Anastasiya REVER
Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, e-mail: radkov_n@ukr.net

Abstract

The objective of this work was to study the environments and processes of ancient sedimentation in the epi- and mesopelagic basins of the Carpathian-Black Sea region and to clarify the conditions of oil and gas basins formation within the study region as well as the main aspects of hydrocarbon generation.

The burial history of the basins, some aspects of their fluid regime, issues of lithogenetic record, features of transformation of sedimentary basins into the rock-formation basins and the development of the latter during the Phanerozoic are considered. The spatial and temporal peculiarities of the evolution of epi-mesopelogic systems and their influence on the formation of oil- and gas-bearing strata within the Carpathian-Black Sea region have been studied.

It has been established that in the sedimentary basins of the Carpathian-Black Sea continental margin of the Tethys Ocean during the long geological history the different intensity structural and morphological changes took place: changes of the subsidence rate of the basin bottom, inversion uplifts, sedimentation pauses, deformation of the sedimentary fill. This was reflected both in the peculiarities of the development of sedimentary environments and in the processes of substance differentiation with the formation of certain post-sedimentary mineral-structural parageneses. It was proved that discrete processes of differentiated compaction and defluidization of sediments cause a number of deformation phenomena, which can be reflected in the features of the morphology of the sedimentary basin bottom, influencing the nature of sediment transportation and accumulation. On the basis of the conducted investigations a number of practical results were obtained which will allow forming new approaches to criteria of hydrocarbons prospecting, in particular the lithophysical aspect which is concentrated on the reservoir properties of rocks; sedimentary reconstructions and the diversity of cyclicity of the studied sediments as a factor of the establishment of prospective areas, reconstruction of the burial history, which provides an information on the state of transformation of organic matter and hydrocarbons, and therefore the range of prospective depths for oil and gas occurrence.

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Keywords

geological paleoceanography, sedimentary-rock basins, Tethys Ocean, sedimento-lithogenesis, black shale strata, oil and gas bearing.

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