Structural features of the lower Permian salt-bearing series and the character of salt-tectogenesis manifestations in the Caspian Depression. Paper II

Pisarenko, Yuri A.; Honcharenko, Olha; Pisarenko, Vladimir Yu.

doi:10.18500/1819-7663-2021-21-2-93-102

Cited by 3 publications

(1 citation statement)

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“…The age range of salt-bearing deposits has extended from the Latest Artinskian time of the end of the Early Permian to the Late Roadian (Kazanian) time at the beginning of the Late Permian [16]. The early assumptions about the widespread development of the Roadian (Kazanian) salt were not confirmed, and no biostratigraphically substantiated thick deposits of Roadian (Kazanian) youngest salt were found in the southern and eastern areas [17].…”

Section: The Geological Features Of the North Caspian Basinmentioning

confidence: 99%

The Geotectonic Peculiarities of the North Caspian Permian Salt-Bearing Basins (Kazakhstan)

Zhemchuzhnikov,

Akhmetzhanov,

Ibrashev

et al. 2024

Geosciences

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This article examines the geotectonic and sedimentary features of the Upper Devonian–Carboniferous–Permian deposits of the North Caspian basin, represented by deposits of marine Paleozoic-isolated carbonate platforms formed during the subsidence of the basement on the passive continental margin. The top is covered by thick salt-bearing Kungurian deposits from the end of the Early Permian epoch. The formation of carbonate platforms is associated with a major tectonic restructuring of the basin at the turn of the Caledonian and Hercynian eras, when the Paleo-Tethys Ocean was formed and isolated carbonate islands began to grow in an open marine environment. The central part of the depression experienced a long and gradual subsidence that spanned the entire Paleozoic era and the beginning of the Mesozoic era. In the south and east, from the Devonian to the Permian periods, barriers were formed in the form of island carbonate massifs that separated the North Caspian basin from the Paleo-Tethys Ocean. During the formation of the salt-bearing basin, these barriers limited water exchange and ensured a one-way influx of sea water from the open ocean. As a result, at the end of the Permian period, thicker salts accumulated; however, during the collision of the continental massifs, an invasion of many kilometers of redbeds occurred. They initially stopped salt accumulation; however, gradually, in the north of the Caspian Sea during Roadian times, the salt accumulation continued. The post-Roadian time is associated with the influx of large quantities of redbed sediments, which caused gravitational instability in the underlying salt, and salt tectonics began with the formation of domal structures.

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Section: The Geological Features Of the North Caspian Basinmentioning

confidence: 99%

The Geotectonic Peculiarities of the North Caspian Permian Salt-Bearing Basins (Kazakhstan)

Zhemchuzhnikov,

Akhmetzhanov,

Ibrashev

et al. 2024

Geosciences

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Stratigraphy and Seismostratigraphy of the Permian Evaporite Formation in the Salt-Producing Province of the Caspian Region: Problems and Solutions

Antipov,

Bykadorov,

Volozh

et al. 2023

Stratigrafiâ. Geologičeskaâ korrelâciâ

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The paper deals with the composition and stratigraphy of the evaporite formation in the salt-producing province of the Caspian region. Based on seismostratigraphic approach, the correlation of geological sections in the lateral areas of the salt-producing province with the halokinetically deformed sections in the central areas of the Preсaspian depression is proposed. As a result of the research, a new local stratigraphic scheme of the Permian evaporite formation of the Central subprovince is proposed and the principles of its construction using the results of the seismostratigraphic analysis of the Asselian-Tatarian seismogeological substage and the accepted serial legends of three groups of sheets of geological maps (scale 1 : 1000 000; Scyphian (South-European), Central-European, and Uralian maps) are outlined. The results obtained significantly clarify the known schemes of the oil and geological zoning of the Caspian oil and gas province and contribute to the development of the resources of the deep (subsalt) horizons of its sedimentary cover.

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Influence of the Evaporite Formation Structure on Salt Tectonics and Hydrocarbon Traps (By the Results of Numerical Simulation of Halokinesis in the Pre-Caspian)

Лунев

Лапковский

Антипов

et al. 2023

Geodin. tektonofiz.

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Within the Pre-Caspian sedimentary basin, there is certain regularity in the distribution of types of structures of salt tectonics. It is characterized by concentric zoning corresponding to the change in the sedimentation thickness of the evaporite sequence. As it increases from 0 to 6 km towards the center of the basin, stamp (embryonic) salt uplifts are replaced by salt pillows first and then by salt domes and diapirs, finally changing to salt massifs and amoeboid-shaped salt ridges. In addition, diapirs in the sections of the Pre-Caspian basin, drawn from the drilling and seismic data, are shaped like high-amplitude "fingers" with a flat base, which is not a typical picture of the Rayleigh – Taylor instability development. Since halokinesis is the main factor controlling the migration and accumulation of hydrocarbons in the Preaspian region, background and aim of prospecting and exploration require identifying the specifics of the formation of various types of salt structures and the relationship between their location patterns and halokinesis process.Numerical simulation shows that, depending on the instable layer thickness and its relationship with the total thickness of the overlying layers, the instability development occurs at different rates, forming different types of structures. When the thickness of the instable layer is greater than or comparable to the thickness of the denser overburden, there occur the salt masses. A greater thickness of the overlying layer gives rise to the formation of classical mushroom-shaped diapirs. A small-thickness low-density layer first undergoes a full bending as it rises, so that its top and bottom turn out to be morphologically similar to each other, thus giving a misleading impression of ordinary stamp folds. Somewhat greater thickness of the low-density layer leads to the development of "pillows" therein. Detailed modeling made it possible to relate the specific shape of the Pre-Caspian diapirs to the fact that the basal and top horizons of the evaporite formation, being composed mainly of terrigenous, carbonate and sulfate rocks, have a normal, non-inverse density and mask complex diapiric structures of halite-saturated domal cores.

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Structural features of the lower Permian salt-bearing series and the character of salt-tectogenesis manifestations in the Caspian Depression. Paper II

Cited by 3 publications

References 0 publications

The Geotectonic Peculiarities of the North Caspian Permian Salt-Bearing Basins (Kazakhstan)

The Geotectonic Peculiarities of the North Caspian Permian Salt-Bearing Basins (Kazakhstan)

Stratigraphy and Seismostratigraphy of the Permian Evaporite Formation in the Salt-Producing Province of the Caspian Region: Problems and Solutions

Influence of the Evaporite Formation Structure on Salt Tectonics and Hydrocarbon Traps (By the Results of Numerical Simulation of Halokinesis in the Pre-Caspian)

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