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LITHOGENESIS OF UPPER JURASSIC DEPOSITS OF OUTER ZONE OF THE CARPATHIAN FOREDEEP

Home > Archive > No. 3–4 (191–192) 2023 > 105–121


Geology & Geochemistry of Combustible Minerals No. 3–4 (191–192) 2023, 105–121

https://doi.org/10.15407/ggcm2023.191-192.105

Marta MOROZ

Institute of Geology and Geochemistry of Combustible Minerals of National Academy of Sciences of Ukraine, Lviv, Ukraine, e-mail: martamgv69@gmail.com

Abstract

Geological- and biological-paleogeographical conditions of sedimentogenesis within the Carpathian segment of Tethys ocean during Tithonian were considered. The rock-forming organisms with calcic function (flora and fauna), which compose main lithological types of carbonate rocks were identified.

On the base of biological-paleoceanographical and lithological investigation of different genetic types of Upper Jurassic carbonate rocks of the Outer zone of the Carpathian Foredeep and analysis of literature data on modern carbonate sediments, the structural classification of Late Jurassis epipelagic sediments of the Carpathian segment of the Meso-Tethys was made. In that classification pelitic, aleuritic, psammitic and ruditic fractions of sediments were distingnished.

Geological-paleogeographical model of occurrence of the Tithonian sediments within the Carpathian segment of the Meso-Tethys (the Outer zone of the Carpathian Foredeep) was built by the author. That model presents areals of biogenic and abiogenic epipelagic sediments and depicts their facial variations.

Geological-paleogeographical study of Upper Jurassic sediment complexes of epipelagic part of the Meso-Tethys has shown that they were formed within widespread interior shelf, probably, with small inclination of the sea bottom. In Upper Jurassic there was abundant growth of the benthos with calcic function and avalanchecal sedimentation of their skeletal remains took place with forming of biogenic carbonate sediments. The coral-algae biocoenosis there were biological indicators of considered parts of Tethys region. In modern basins of the World ocean analogous processes take place at the depths of about 50 m, in temperature conditions about 23–25 °C and the salinity of the sea waters about 2.7–3.8 ‰.

The manifestations of diagenetic and katagenetic processes in the Upper Jurassic carbonate rocks of Outer zone of the Carpathian Foredeep have been investigated and their influence of the formation of the reservoir properties of rocks has been found out.

During the diagenesis, the rocks were recrystallized, micritizated and cemented. From the mineralogical point of view, the changes consisted in the transformation of primary aragonite and magnesium-calcite skeletal remains of organisms into calcite, as well as processes of dolomitization, ferruginization and silicification. At the stage of diagenesis, Fe-containing minerals ̶ glauconite and pyrite ̶ has been formed. The dolomitization of Jurassic organogenic limestones of Outer zone of the Carpathian Foredeep has been caused by the mixing of the fresh meteoric waters with buried marine pore waters in the underground phreatic zone adjacent to the ancient coastline. Silicification is a consequence of the metasomatic substitution of the carbonate substance by silicate, which has been caused by decrease of the pH occurred after dolomitization.

Katagenetic transformation of the rocks are manifested in the dissolution of the remains of organisms, grains of carbonate cement and the late cementation of pores and microfractures. Changes of carbonate rocks are associated with the bringing of certain substances in the sediment (sulphatization, celestinization) or their removal (dedolomitization, decementation). Neoplasm minerals of the katagenesis stages are represented by anhydrite and celestine.

The proceses of recrystallization of carbonate rocks at different stages of katagenesis contributed to the selective leaching of limestones and dolomites and led to formation of secondary cavities and caverns, different in shape and size. The predominance of cavities of certain types determines the type of reservoir, among which are distinguished pores, pore-caverns and joint caverns. The processes of diagenesis and katagenesis are associated with the dissolution of carbonate material, which differently affects the reservoir properties of sediments. Authigenous mineral formation, with the exception of dolomitization, impairs the reservoir properties of the Upper Jurassic carbonate rocks, and recrystallization improves.

Burial of carbonate rocks at depth contributes to the preservation and even improvement of their reservoir properties both due to dissolution and textural heterogeneity (jointing develops at the boundary of the elements of textural heterogeneity). Observations show that the most favourable in this respect are organogenic and detrital varieties of carbonate rocks. The presence of clay minerals in the composition of their cement increases the textural heterogeneity and, as a consequence, the ability to formation of joints.

Keywords

carbonate rocks, sedimentogenesis, diagenesis, katagenesis, reservoir properties, Upper Jurassic, Carpathian Foredeep

Referenses

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EVOLUTION OF CONDITIONS OF SEDIMENTOGENESIS IN THE CARPATHIAN FLYSCH BASIN IN THE CRETACEOUS-PALEOGENE

Home > Archive > No. 3–4 (191–192) 2023 > 86–104


Geology & Geochemistry of Combustible Minerals No. 3–4 (191–192) 2023, 86–104

https://doi.org/10.15407/ggcm2023.191-192.086

Ihor POPP, Halyna HAVRYSHKIV, Yulia HAIEVSKA, Petro MOROZ, Mykhailo SHAPOVALOV

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

Abstract

The aim of this work is to show the evolution of geological-paleoceanographic and geochemical conditions of sedimentation in the segment of Carpathians of the Tethys Ocean. And also, selection of the basic stages of sedimentogenesis, to which the formation of oil and gas parent and oil- and gas-bearing deposits is timed.

In the article, the authors showed the lithologic-genetic classification of the Cretaceous-Paleogene flysch of the Ukrainian Carpathians. Authors distinguished the lithologic-geochemical types of sedimentation son the basis of geochemical terms of sedimentation, and also lithologic-facies types of sedimentation on the basis of features of terrigenous sedimentation.

Four stages of sedimentogenesis in the history of geological and paleoceanographic development of the Carpathian sedimentary basinare described in the article: Early Cretaceous (stage I), Late Cretaceous (stage II), Paleocene-Eocene (stage III), Oligocene-Early Miocene (stage IV), each of which has specific geochemical conditions of sedimentogenesis and diagenesis.

It is shown that forming of Cretaceous-Paleogene flysch deposits of Ukrainian Carpathians took place under action of very changeable geological-paleoceanographic and geochemical factors the joint action of that stipulated oil and gas capacity of this sedimentary complex. The thick series of psamitolites were formed in periods of avalanche terrigenous sedimentation, that are the reservoirs of hydrocarbons. Formation of bituminous parent-rocks-of-oil siliceous-clayed sedimentation is related to deceleration of processes of terrigenous sedimentation and phases of ocean anoxic events of ОАЕ-1 (Barremian–Albian) and ОАЕ-4 (Oligocene).

Keywords

Carpathian flysch basin, sedimentogenesis, flysch, geological-paleoceanographic and geochemical conditions, oil and gas potential

Referenses

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HETEROGENEITY OF LITHOGENESIS OF THE SILURIAN SEDIMENTS OF VOLYNO-PODILLYA

Home > Archive > No. 3–4 (191–192) 2023 > 74–85


Geology & Geochemistry of Combustible Minerals No. 3–4 (191–192) 2023, 74–85

https://doi.org/10.15407/ggcm2023.191-192.074

Volodymyr HNIDETS1, Kostjantin HRIGORCHUK2, Lina BALANDIUK

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

Abstract

The paper examines the features of the lithological-lithmological structure and the regime of catagenesis of the Silurian sediments of the Lishchynska and Rava-Ruska sections of Volyno-Podillya. It is shown that in the direction from the southwest to the northeast, the role of carbonate rocks in the composition of the stratum increases, which is connected with the established facies zonation. However, the structure of the section in these areas is different: in Rava-Ruska, it is more thinly layered. The sediments are also characterized by the spatial and age heterogeneity of the distribution of carbonate lithmites: in the first case, they tend to the boundary of the Upper and Lower and the middle of the Upper Silurian, and in the second case, they are developed in the tops of the Lower, in the lower, middle, and upper parts of the Upper Silurian. Attention is drawn to the significant role of clay and the absence of marl formations in the deposits of the Rava-Ruska-1 well, which testifies to the heterogeneity of sedimentation conditions in the mesopelagial of the Silurian basin. The cyclic nature of Silurian sedimentation is established. At the same time, four regressive episodes are recorded in the Lishchynska area, and five in Rava-Ruska, which may indicate a certain specificity of sedimentation conditions in different parts of the basin. The latter directly affects the peculiarity of the spatial-age distribution of reservoir rocks and aquifers. It is shown that the post-sedimentation transformations are mainly related to the development of authigenic silica and calcite, which is found in both clayey and carbonate rocks. A significant difference in the history of the formation of the oil and gas systems of the Lishchynska and Rava-Ruska areas has been established, which allows us to assess their prospects differently. Thus, in the first case, the generation potential of organic matter of Silurian sediments was largely exhausted by the end of the Mesozoic. In the second, large-scale processes of generation and migration of hydrocarbon fluids began only in Paleogene-Neogene time.

Keywords

Volynо-Podillya, Silurian sediments, lithological structure, cyclicity, catagenesis

Referenses

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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.

Keywords

lithology, facies, sedimentation conditions, Paleocene, Karkinite Depression

Referenses

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Hnidets, V. P., Hryhorchuk, K. H., & Balandiuk, L. V. (2021). Osoblyvosti formuvannia nyzhnokreidovoi tektono-sedymentatsiinoi systemy Prychornomorskoho mehaprohynu [Peculiarities of formation of the Lower Cretaceous teсtono-sedimentation system of the Black Sea megadepression]. Heolohichnyi zhurnal, 2(375), 67–78. https://doi.org/10.30836/igs.1025-6814.2021.2.224399 [in Ukrainian]

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LITHOGEOCHEMISTRY OF BLACK SHALES OF THE PHANEROZOIC OF THE WESTERN UKRAINE – UNCONVENTIONAL HYDROCARBON RESERVOIRS

Home > Archive > No. 1–2 (187–188) 2022 > 82–102


Geology & Geochemistry of Combustible Minerals No. 1–2 (187–188) 2022, 82–102.

https://doi.org/10.15407/ggcm2022.01-02.082

Ihor POPP, Petro MOROZ, Mykhaylo SHAPOVALOV

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

Abstract

The purpose of this work is to compare the lithological, geochemical and mineralogical features of carbonaceous clayey and siliceous-clay rocks of Cretaceous-Paleogene flysch of the Ukrainian Carpathians and Lower Silurian of the Volyn-Podillya edge of the East European Platform and to determine the factors that contributed to the formation of zones of “unconventional reservoirs” in these sedimentary strata of cracked and mixed types.

Data from the lithology, geochemistry and mineralogy of bituminous siliceous-clay rocks and siliceous rocks of Lower Cretaceous and Oligocene of the Carpathians and black argillites of Lower Silurian of the Volyn-Podillya edge of the East European Platform are presented.

Sedimentogenesis of Lower Cretaceous and Oligocene bituminous deposits of the Carpathians and Lower Silurian deposits of Volyn-Podillya took place in anoxic conditions (phases of oceanic anoxic events: OAE-1 (Barrem–Albian), OAE-4 (Oligocene) and at the border of Ordovician and Silurian. Paleoceanographic conditions of their sedimentation differed significantly. The first are deep-sea formations at the foot of the continental slope of the Carpathian segment of the Tethys Ocean, the second were accumulated in the warm shallow sea on the eastern shelf of the West European Sea Basin.

The layered texture of carbonaceous deposits, as well as the catagenetic transformation of rock-forming clay and siliceous minerals and their hydrophobization, played a significant role in the formation of the filtration capacity properties of “unconventional reservoirs”. In Cretaceous-Paleogene flysch deposits of the Carpathians, “unconventional reservoirs” are usually terrigenous-clay or siliceous-clay rocks with shale and layered texture or compacted sandstones localized in conventional oil, gas or condensate deposits. Lower Silurian clay deposits of Volyn-Podillya are promising for the search for “shale gas”.

Keywords

unconventional reservoirs, black shales, shale gas, clay minerals, organic carbon

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LITHOLOGICAL-GEOCHEMICAL TYPES OF DEPOSITS OF CRETACEOUS-PALEOGENE FLYSCH OF THE UKRAINIAN CARPATHIANS AND CONDITIONS OF THEIR FORMAITION

Home > Archive > No. 4 (181) 2019 > 116-133


Geology & Geochemistry of Combustible Minerals No. 4 (181) 2019, 116-133.

https://doi.org/10.15407/ggcm2019.04.116

Ihor Popp, Petro Moroz, Mykhailo Shapovalov

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 results of lithological, mineralogical and geochemical investigation of Cretaceous-Paleogene flysch deposits of the Ukrainian Carpathians are cited here. There are three main lithological-geochemical types of these deposits which differ in the composition of rock-forming ingredients of biogenic origin (SiO2 biog, CaCO3, Corg): grey limestone-clayey-terrigenous (type-I), non-carbonate or low-carbonate-clayey-terrigenous (type-II), and black carbonate-silica-terrigenous-clayey (type-III). The deposits of the first type are attributed to alkaline-oxic (oxic-calcitic), the second – to acid and low-alcaline oxic (oxic with redeposited glauconite), the third – to reducing (siderite, dolomite or ferrodolomite and low-reducing calcitic) and strong by reducing (primary-sulfidic or hydrogen sulfidic) mineralogical-geochemical facies. The forming of the Barremian-Albian (Shypot suite; Spas suite) and Oligocene (Menilite suite; Dusynska suite) organic-rich sediments in the Ukrainian Carpathians we associate with the phase of oceanic anoxic events OAE-1 and OAE-4 in the Carpathian segment of the Tethys, where anoxic reducing environments favoured to fossilization of huge amount of the dispersed organic matter. The structural-fabric features and composition of separate lithological types of silicites and diagenetic concretions of the Lower Cretaceous and Oligocene of the Ukrainian Carpathians show that their sedimentogenesis and diagenesis took place in conditions of strong oxygen deficit. The studied siliceous rocks can be considered as indicators of the anoxic events in the Carpathian segment of Tethys ocean. It is shown, that alcaline-reducting environments which was the most favourable for the diagenetic transformation of sedimentary organic matter in to petroleum hydrocarbons, prevailed in the organic-rich deposits of Oligocene age.

Keywords

sedimentogenesis, diagenesis, silica, carbonate, sulfides, organic matter, mineralogical-geochemical facies, Cretaceous-Paleocene flysch, Ukrainian Carpathians.

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