Permian sediments within the Buzuluk depression of the Samara region: prospects, problems and solutions

UDK: УДК 553.98
DOI: DOI: 10.24887/0028-2448-2021-11-94-97
Key words: Permian sediments, reservoir, interpretation, processing, upper part of the section, reef, through structure, shooting spread
Authors: V.N. Kozhin1, R.Z. Mamedov1, E.I. Ziganshin1, S.V. Troshkin1, Yu.V. Ishkhanova1, K.S. Reytyukhov1, S.P. Papukhin2, M.N. Fedotov3 1SamaraNIPIneft LLC, RF, Samara 2Samaraneftegas JSC, RF, Samara 3Rosneft Oil Company, RF, Moscow

Intensive study of the oil and gas content of the Permian system in the Samara region was carried out mainly in the fifties in connection with the identification and industrial development of oil and gas fields in the Pokhvistnevsko-Buguruslansky (Upper Permian deposits) and Kinel-Cherkassky (Upper and Lower Permian deposits) areas. By the mid-sixties, prospecting interest in Permian deposits had declined after the discovery of high-yield deposits in the carboniferous and Devonian deposits in the central part of the region. A common feature for the central and southern parts of the drilled territory is the discrepancy between the structural plans of the upper and Lower Permian. In addition, there is a local discrepancy between the structural plans inside the Kungurian and Kazanian strata (due to changes in the thickness of the halite layers). Due to the deep occurrence of subsalt deposits in the extreme south and in the center of the district, the technical equipment and economic conditions for drilling enterprises did not allow drilling on the subsalt Kungurian deposits. All these facts were the reason for the termination of structural drilling and its replacement with seismic exploration.  The Permian deposits were not studied purposefully, but during the drilling of deep wells, they were repeatedly recorded throughout the eastern part of the Buzuluk Depression. At the same time, there is reason to believe that the prospects for the oil and gas content of the Permian deposits are not fully disclosed, and with further improvement of their geological structure by modeling shooting spread of the common depth point method observation systems to select the optimal parameters, new oil deposits can be discovered in them. Relatively small depths of occurrence of promising Permian deposits (from 600-700 m in the central part to 1000-1200 m in the extreme south of the region), relatively simple geological drilling conditions determine high-quality testing and cost-effectiveness of work.

References

1. Kochubenko O.V., Aleksandrov A.A., Otsenka perspektiv neftegazonosnosti permskikh otlozheniy Buzulukskoy vpadiny Samarskoy oblasti (Assessment of the oil and gas potential of the Permian deposits of the Buzuluk depression of the Samara region), Samara: Publ. of Volga branch of IGiRGI, 1999, 191 p.

2. Kornienko A.A., Sozdanie tsifrovoy modeli geologicheskogo stroeniya verkhnego opornogo otrazhayushchego gorizonta osadochnogo chekhla v zone sochleneniya Buzulukskoy vpadiny i Zhigulevsko-Pugachevskogo svoda (Creation of a digital model of the geological structure of the upper key reflecting horizon of the sedimentary cover in the junction zone of the Buzuluk depression and the Zhigulevsko-Pugachevsky arch), Samara: Publ. of SNGEO, 2015, 97 p.

Intensive study of the oil and gas content of the Permian system in the Samara region was carried out mainly in the fifties in connection with the identification and industrial development of oil and gas fields in the Pokhvistnevsko-Buguruslansky (Upper Permian deposits) and Kinel-Cherkassky (Upper and Lower Permian deposits) areas. By the mid-sixties, prospecting interest in Permian deposits had declined after the discovery of high-yield deposits in the carboniferous and Devonian deposits in the central part of the region. A common feature for the central and southern parts of the drilled territory is the discrepancy between the structural plans of the upper and Lower Permian. In addition, there is a local discrepancy between the structural plans inside the Kungurian and Kazanian strata (due to changes in the thickness of the halite layers). Due to the deep occurrence of subsalt deposits in the extreme south and in the center of the district, the technical equipment and economic conditions for drilling enterprises did not allow drilling on the subsalt Kungurian deposits. All these facts were the reason for the termination of structural drilling and its replacement with seismic exploration.  The Permian deposits were not studied purposefully, but during the drilling of deep wells, they were repeatedly recorded throughout the eastern part of the Buzuluk Depression. At the same time, there is reason to believe that the prospects for the oil and gas content of the Permian deposits are not fully disclosed, and with further improvement of their geological structure by modeling shooting spread of the common depth point method observation systems to select the optimal parameters, new oil deposits can be discovered in them. Relatively small depths of occurrence of promising Permian deposits (from 600-700 m in the central part to 1000-1200 m in the extreme south of the region), relatively simple geological drilling conditions determine high-quality testing and cost-effectiveness of work.

References

1. Kochubenko O.V., Aleksandrov A.A., Otsenka perspektiv neftegazonosnosti permskikh otlozheniy Buzulukskoy vpadiny Samarskoy oblasti (Assessment of the oil and gas potential of the Permian deposits of the Buzuluk depression of the Samara region), Samara: Publ. of Volga branch of IGiRGI, 1999, 191 p.

2. Kornienko A.A., Sozdanie tsifrovoy modeli geologicheskogo stroeniya verkhnego opornogo otrazhayushchego gorizonta osadochnogo chekhla v zone sochleneniya Buzulukskoy vpadiny i Zhigulevsko-Pugachevskogo svoda (Creation of a digital model of the geological structure of the upper key reflecting horizon of the sedimentary cover in the junction zone of the Buzuluk depression and the Zhigulevsko-Pugachevsky arch), Samara: Publ. of SNGEO, 2015, 97 p.



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