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Scientific, Technological and Production Journal
ISSN 2079–3332 (print)
ISSN 3034-6835 (online)
founded in 2001

Geological and geodynamic conditions for the formation of hydrocarbon deposits in the Southern Pre-Urals

Original articles: 2026 No 5

Geological and geodynamic conditions for the formation of hydrocarbon deposits in the Southern Pre-Urals

DOI: 10.56195/20793332-2026-26-5-105-112

Read in pdf M.V. Andreev1, V.P. Petrishchev1,2, G.A. Ponomareva1
  1. Federal State Budgetary Educational Institution of Higher Education "Orenburg State University named after V.A. Bondarenko", Orenburg, Russian Federation
  2. Federal State Budgetary Institution of Science Orenburg Federal Research Center of the Ural Branch of the Russian Academy of Sciences, Orenburg, Russian Federation
p. 105-112, No.5/2026
Abstract:
The geological and geodynamic conditions for the formation of hydrocarbon deposits in the Southern Pre-Urals are examined. A comprehensive analysis was carried out of the deep structure of the Earth’s crust and the fault-block tectonics of the crystalline basement, which comprises rocks of Precambrian and Baikalian ages and is divided by a system of regional faults into blocks of different orders. Interpretation of gravity and magnetic data and seismic surveys refined the positions of the main fault zones (the Tokovsky and Sakmara-Ilek faults and a system of submeridional faults), which control the inherited development of the sedimentary cover. The structure of the sedimentary cover was investigated; it comprises three structural and lithological complexes (subsalt, intersalt, and suprasalt), whose thicknesses systematically increase from west to east from 2–3 to 10–12 km. An inherited relationship between the block structure of the basement and the formation of local uplifts in the sedimentary cover is demonstrated. Analysis of the spatial distribution of known fields in the Bolshekinelskaya and Kamelik-Chaganskaya zones established their clear association with zones influenced by deep faults and with fault intersections. The decisive role of near-fault fracture zones in forming reservoirs with improved permeability and storage properties and in creating various types of hydrocarbon traps is substantiated. Seismic monitoring and satellite geodesy (GPS/GNSS) data indicate present-day geodynamic activity in the region (movement rates of 2–4 mm/year and seismicity of Mw = 1.5–3.0), which directly affects fluid redistribution and field development parameters. A generalized model of the control of hydrocarbon accumulation by fault-block tectonics is proposed, incorporating the framework function of faults, their control of sedimentation and lithogenesis, the creation of hydrocarbon migration pathways, and trap formation. Practical application of the model will improve the effectiveness of predicting and exploring local targets controlled by tectonic faults, particularly at advanced stages of regional exploration.
Keywords:
fault-block tectonics, Southern Pre-Urals, geodynamics, near-fault fracturing, fractured reservoirs, seismicity, hydrocarbon accumulation, basement, sedimentary cover, Orenburg oil-gas-condensate field
For citation:
Andreev M.V., Petrishchev V.P., Ponomareva G.A Geological and geodynamic conditions for the formation of hydrocarbon deposits in the Southern Pre-Urals. Mine Surveying and Subsurface Use. 2026; 26 (5): 105-112. (In Russ.). https://doi. org/10.56195/20793332-2026-26-5-105-112
Information about the authors:
  1. Maxim V. Andreev – Postgraduate Student at the Federal State Budgetary Educational Institution of Higher Education "Orenburg State University named after V. A. Bondarenko", Orenburg, Russian Federation; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
  2. Vadim P. Petrishchev – Dr. Sci. (Geogr.), Professor of the Department of Geology, Geography and Cadastre, Orenburg State University named after V. A. Bondarenko, Orenburg, Russian Federation
  3. Galina A. Ponomareva – Cand. Sci. (Geol. & Mineral.), Associate Professor of the Department of Geology, Geography and Cadastre, Orenburg State University named after V. A. Bondarenko, Orenburg, Russian Federation
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