Oil-producing rocks of sakmara and sarbaev formations of the Southern Urals
https://doi.org/10.51890/2587-7399-2023-8-3-93-101
Abstract
Introduction. The Southern Urals is considered as an oil and gas promising region. In 2022, new results of its study were obtained.
Aim. Identification of oil-producing rocks, reservoir rocks and tires in the Southern Urals, identification of potentially oil-and-gas complexes, assessment of the prospects for oil and gas potential of the Orenburg segment of the Magnitogorsk trough, development of recommendations for setting up regional geological exploration for oil and gas.
Materials and methods. As part of the study of the prospects of oil and gas potential of the region, 13 outcrops and rock sections were examined. A laboratory study of the samples was performed.
Results. The Sakmar formation (S1-D1sk) is composed of shales siliceous, carbonaceous-siliceous, carbonaceous-clay, clay-siliceous, phthanites. Width 150−700 m. According to the thermogravimetric analysis of shales (18 samples), the average organic substance content is 8.2 %, the maximum is 10.4 %. They belong to the «very rich» oil-producing rocks. The Sarbaev formation (D2-3sr) is composed of siliceous and clay siltstones, siliceous-carbonaceous-clay and carbonaceous-siliceous (carbonaceous) shales, variegated jasper-like silicides. Its width is 50−300 m. According to the thermogravimetric analysis of shales (8 samples), the average organic substance content is 1,3 %, the maximum is 3,2 %. They belong to the «rich» oil-producing rocks. The oil-producing potential of the Sarbaev formation has been established for the first time. The degree of regional metamorphism of the shales of the two formations is the initial stages of catagenesis.
Conclusion. The results obtained increase the forecast prospects of oil and gas content of carbonate-terrigenous deposits of the advanced folds of the Urals (Famennian-Lowerpermian) and Magnitogorsk trough (Famennian-Middlecarbonic). The oil-producing rocks of the Sakmar and Sarbaev formations or their analogues are predicted under them. It is recommended to continue the study of sedimentary deposits of the Southern Urals as oil-producing rocks.
About the Authors
S. E. MakarovRussian Federation
Sergey E. Makarov — Cand. Sci. (Geol.-Min.)
A. M. Tyurin
Orenburg State University
Russian Federation
Russian Federation
Anatoly M. Tyurin — Cand. Sci. (Geol.-Min.), Associate Professor
Scopus ID: 57411873000
13, Prospect Pobedy, 460018, Orenburg
A. V. Snachev
Institution of Geology of UFRC RAS
Russian Federation
Russian Federation
Aleksandr V. Snachev — Cand. Sci. (Geol.-Min.), Head of Ore deposits laboratory
Scopus ID: 54279602100
16/2, K. Marx str., 450077, Ufa
A. V. Panteleeva
Orenburg State University
Russian Federation
Russian Federation
Aleksandra V. Panteleeva — Cand. Sci. (Geol.-Min.), Associate Professor
Scopus ID: 57205221857
13, Prospect Pobedy, 460018, Orenburg
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For citations:
Makarov S.E., Tyurin A.M., Snachev A.V., Panteleeva A.V. Oil-producing rocks of sakmara and sarbaev formations of the Southern Urals. PROneft. Professionally about Oil. 2023;8(3):93-101. (In Russ.) https://doi.org/10.51890/2587-7399-2023-8-3-93-101
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