
ISSN 1608-5078 (Online)
Visean terrigenous sediments of the South Tatar Arch (Volga-Urals oil and gas bearing province) – multifacial filling of the karst surface of the Tournaisian isolated carbonate platform
V.V. Silantiev, M.F. Validov, D.N. Miftakhutdinova, N.G. Nourgalieva, E.A. Korolev, B.G. Ganiev, A.A. Lutfullin, K.D. Shumatbaev, R.M. Khabipov, V.A. Sudakov, Yu.A. Akhmadullina, K.A. Golod, A.A. Leontev, R.R. Shamsiev, D.A. Nikonorova, S.S. Krikun, M.V. Noykin, E.A. Abdullina
Original article
open access
The paper presents new thickness and sandiness maps of the Visean terrigenous strata (Radayevkian and Bobrikian regional stages, Lower Carboniferous) of the South Tatar Arch, constructed using the “Natural Neighbour” spatial interpolation method in ArcGIS Pro software based on the analysis of geophysical survey data for more than 30,000 boreholes.
The interpretation of the maps in combination with the results of sedimentological, ichnotextural and petrophysical core studies, supplemented by the analysis of archival and published materials, provided an opportunity to update the approach to modelling the sedimentation of the terrigenous Lower Carboniferous of the South Tatar Arch. The proposed sedimentation models of terrigenous and coal-bearing sediments take into account the chronostratigraphic data, the karstification of isolated carbonate platforms, the sediment accumulation rates and the ichnotextural characteristics of the sediments. It is concluded that the accumulation and preservation of terrigenous and peat (coal-bearing) sediments differ in duration (0.1 million years vs. 1.5–2 million years) and are consequently associated with transgressive and regressive phases.
The accumulation of terrigenous sediments includes: (a) transgressive eustatic episodes – short-term incursions of a marine basin onto the eroded surface of an isolated carbonate platform, during which silty and sandy, well-sorted bioturbated sediments were accumulated, often with a variety of ichnofossils of marine benthic organisms; (b) the regressive eustatic phase resulted in the predominant erosion of sediments on the arch; whereas sediments in the incisions were largely preserved.
The accumulation of peat (coal-bearing) deposits includes (a) the regressive eustatic phase, during which the vast area of the eastern Volga-Urals region was covered with flourishing vegetation and stable swamp environments were forming in the incisions of the Tournaisian surface; (b) the transgressive phase – the peat was overlaid and buried by transgressive marine silt-sand sediments; then it was compacted and transformed into coal. The alternation of coal-bearing and transgressive intervals indicates the cyclicity of these processes.
The proposed sedimentation models extend the concepts of previous studies and are consistent with the developed maps of thickness and sandiness of the Lower Carboniferous terrigenous sediments, explaining the complex, covering and mosaic distribution of sand bodies over the area, as well as the filling of incisions with sediments of different lithological types.
sedimentation, terrigenous Carboniferous, Bobrikian regional stage, incisions, Volga-Urals, oil-bearing, reservoir rocks
Vladimir V. Silantiev – Dr. Sci. (Geology and Mineralogy), Head of Department of Paleontology and Stratigraphy, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
e-mail: Vladimir.Silantiev@kpfu.ru
Marat F. Validov – Lead Engineer, Head of Petrophysical Department, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Dinara N. Miftakhutdinova – Assistant of Department of Paleontology and Stratigraphy, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Nouria G. Nourgalieva – Dr. Sci. (Geology and Mineralogy), Professor, Department of Oil and Gas Geology named after Academician A.A. Trofimuk, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Eduard A. Korolev – Cand. Sci. (Geology and Mineralogy), Head of Department of General Geology and Hydrogeology, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Bulat G. Ganiev – Head of the Department of Field Development, Tatneft PJSC
75 Lenin st., Almetyevsk, 423450, Russian Federation
Azat A. Lutfullin – Deputy Head of the Department of Field Development, Tatneft PJSC
75 Lenin st., Almetyevsk, 423450, Russian Federation
Kirill D. Shumatbaev – Chief Expert (on petrophysical research), Department of Field Development, Tatneft PJSC
75 Lenin st., Almetyevsk, 423450, Russian Federation
Rishat M. Khabipov – Head of the Field Development and Subsoil Use Monitoring Division, Department of Field Development, Tatneft PJSC
75 Lenin st., Almetyevsk, 423450, Russian Federation
Vladislav A. Sudakov – Deputy Director of the Institute for Innovation, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Yuliya A. Akhmadullina – Engineer, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Kseniya A. Golod – Engineer, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Aleksey A. Leontev – Lead Engineer, Head of Well Logging Interpretation Department, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Ruslan R. Shamsiev – Engineer, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Daria A. Nikonorova – Assistant, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Svetlana S. Krikun – Assistant, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Mikhail V. Noykin – Engineer, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Elina A. Abdullina – Engineer, Center for Excellence of Digital Technologies in the Oil and Gas Industry, Institute of Geology and Petroleum Technology, Kazan Federal University
18 Kremlevskaya st., Kazan, 420008, Russian Federation
Silantiev V.V., Validov M.F., Miftakhutdinova D.N., Nourgalieva N.G., Korolev E.A., Ganiev B.G., Lutfullin A.A., Shumatbaev K.D., Khabipov R.M., Sudakov V.A., Akhmadullina Yu.A., Golod K.A., Leontev A.A., Shamsiev R.R., Nikonorova D.A., Krikun S.S., Noykin M.V., Abdullina E.A. (2023). Visean terrigenous sediments of the South Tatar Arch (Volga-Urals oil and gas bearing province) – multifacial filling of the karst surface of the Tournaisian isolated carbonate platform. Georesursy = Georesources, 25(4), pp. 3–28. https://doi.org/10.18599/grs.2023.4.1