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Dolomite reservoir rocks of the bashkirian stage on the southern slope of the South-Tatarian arch

Authors: E.A. Korolev, PhD, N.G. Nurgalieva, V. M. Smelkov, PhD, A. A. Eskin, PhD, A. V. Kalcheva Institute of Geology and Petroleum Technologies, KFU

Key words: dolomite reservoir rocks, the Bashkirian stage, reservoir rocks properties.

The southern slope of South-Tatarian Arc contains a lot of oil deposits in the Upper Paleozoic including old deposits in the Devonian and the Lower Carboniferous rocks and new deposits in the Middle Carboniferous rocks, especially, the deposits in the carbonate rocks within the Bashkirian stage. This carbonate object is considered as one of the perspective among the Middle Carboniferous rocks to prospect and develop on investigated area. Core investigations allowed to reveal that the most part of the best reservoir carbonate rocks was found in the zones of the dolomite mineralization. Three-six intervals of higher reservoir rocks properties were established in the sections of the Bashkirian stage. It was observed the decreasing trend in the dolomite mineralization from the center to the periphery of anticline traps. Two crystalline types (cellular and blastogene) of dolomite rocks were revealed.
References
1. Leonov G.V., Korotkova E.I., Sharova N.A., Zaychenko L.I., Perspektivy
poiskov zalezhey nefti i gaza v karbonatnykh otlozheniyakh bashkirskogo
yarusa Orenburgskoy oblasti (Prospects of oil and gas deposits in the carbonate sediments of Bashkirian stage of Orenburg region), Geologiya nefti i gaza = The journal Oil and Gas Geology, 1995, no. 1, pp. 20-24.
2. Bagrintseva K.I., Usloviya formirovaniya i svoystva karbonatnykh kollektorov nefti i gaza (Conditions of formation and properties of carbonate reservoirs of oil and gas), Moscow: Publ. of RSGU, 1999, 282 p.
3. Kol'chugin A.N., Morozov V.P., Korolev E.A. et al., Typical sections of Bashkirian
carbonate rocks and structure of oil deposits in southeast part of the Republic
of Tatarstan (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013,
no. 11, pp. 84-86.
4. Nurgalieva N.G., Microfacies, petrophysics and sequence-stratigraphic
frame of carbonate reservoir rocks of Kizelovskian formation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 3, pp. 38-40.
5. Krinari G.A., Morozov V.P., Korolev E.A., Pikalev S.N., Biogenic mechanisms of formation of secondary dolomites with anomalously high porosity (In Russ.), Litosfera, 2004, no. 1, pp. 31-40.

Key words: dolomite reservoir rocks, the Bashkirian stage, reservoir rocks properties.

The southern slope of South-Tatarian Arc contains a lot of oil deposits in the Upper Paleozoic including old deposits in the Devonian and the Lower Carboniferous rocks and new deposits in the Middle Carboniferous rocks, especially, the deposits in the carbonate rocks within the Bashkirian stage. This carbonate object is considered as one of the perspective among the Middle Carboniferous rocks to prospect and develop on investigated area. Core investigations allowed to reveal that the most part of the best reservoir carbonate rocks was found in the zones of the dolomite mineralization. Three-six intervals of higher reservoir rocks properties were established in the sections of the Bashkirian stage. It was observed the decreasing trend in the dolomite mineralization from the center to the periphery of anticline traps. Two crystalline types (cellular and blastogene) of dolomite rocks were revealed.
References
1. Leonov G.V., Korotkova E.I., Sharova N.A., Zaychenko L.I., Perspektivy
poiskov zalezhey nefti i gaza v karbonatnykh otlozheniyakh bashkirskogo
yarusa Orenburgskoy oblasti (Prospects of oil and gas deposits in the carbonate sediments of Bashkirian stage of Orenburg region), Geologiya nefti i gaza = The journal Oil and Gas Geology, 1995, no. 1, pp. 20-24.
2. Bagrintseva K.I., Usloviya formirovaniya i svoystva karbonatnykh kollektorov nefti i gaza (Conditions of formation and properties of carbonate reservoirs of oil and gas), Moscow: Publ. of RSGU, 1999, 282 p.
3. Kol'chugin A.N., Morozov V.P., Korolev E.A. et al., Typical sections of Bashkirian
carbonate rocks and structure of oil deposits in southeast part of the Republic
of Tatarstan (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2013,
no. 11, pp. 84-86.
4. Nurgalieva N.G., Microfacies, petrophysics and sequence-stratigraphic
frame of carbonate reservoir rocks of Kizelovskian formation (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2012, no. 3, pp. 38-40.
5. Krinari G.A., Morozov V.P., Korolev E.A., Pikalev S.N., Biogenic mechanisms of formation of secondary dolomites with anomalously high porosity (In Russ.), Litosfera, 2004, no. 1, pp. 31-40.


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