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A new direction of exploration of oil deposits on the Bobrovsko-Pokrovsky arch

UDK: 553.98.061.32
Key words: searching for new prospect, upper Devonian carbonate complex, barrier reefs, seal, trap, resources
Authors: V.A. Shakirov, Yu.I. Nikitin, A.P. Vilesov, D.E. Deryushev, K.F. Miropoltsev (TNNC LLC, RF, Tyumen
The article shows the prospects of search new deposits in the Western part of Bobrovsko-Pokrovsky arch within Buzuluk license area. The main source for the analysis is the results of many years of work of the departments of development, exploration and research center of core in TNNC LLC, providing fields of Orenburgneft JSC. A survey of geologic data was made and prospective reservoirs were determined. Up to 2016 it was considered that a large part of Bobrovsko-Pokrovsky arch, especially its western part, not very promising for the search of oil deposits in carbonate upper Devonian. This belief was confirmed by negative test results. It should be noted that all tests were conducted in the most high amplitude morphologically expressed structures, and, as it turned out, hypsometrically a high-positioned layers are not always productive. The spatial distribution of barrier reefs in the middle Famennian – Zavolzhsky and early Famennian age was predicted in this work. The range of oil-bearing deposits, confined to the reefs of different ages was revised. Areas for the search of new deposits in the Zavolzhsky and Middle Famennian sediments were recognized and predicted. According to comparison analysis of the prospects of search for new deposits for conversions and inclusion, the Visean epoch is the most preferable at all fields of Bobrovsko-Pokrovsky arch. The Famennian sediments are the most prospects for reserves and production. The productivity of these reservoirs can be confirmed only by drilling wells. The sidetrack deeping at the Tananykskoye field was due to new pool discovery in upper Famennian sediments. The use of the identified patterns will allow to increase the efficiency of exploration. This is the reason for a new and promising direction of search of oil deposits on Bobrovsko-Pokrovsky arch in the fields controlled by lower Famennian reefs.

References

1. Shakirov V.A., Deryushev D.E., Ivanov M.A., Sereda I.A., Current results of

overlooked targets identification in the fields of the Orenburg region (In Russ.),

SPE 176606-RU, 2015.

2. Dentskevich I.A., Oshchepkov V.A., Patterns of placement of deposits of oil

in the flank of Muhanovo-Erohovskiy deflection (In Russ.), Geologiya nefti i

gaza = The journal Oil and Gas Geology, 1989, no. 5, pp. 21–23.

3. Postoenko P.I., Cherepanov A.G., Prospects of oil bearing Frasnian - Lower

Famennian deposits in the south-east of the Volga-Kama anteclise (In Russ.)

Geologiya nefti i gaza, 1992, no. 2, pp. 28–32.

4. Gorbovskaya O.A., Demidova E.A., Geologicheskoe stroenie Bobrovskogo

mestorozhdeniya i usloviya zaleganiya nefti v plaste BII (bobrikovskiy gorizont)

(The geological structure of the Bobrovsky f ield and conditions of occurrence

of oil in the reservoir BII (Bobrikovian)), Proceedings of XVI Mezhdunarodnogo

simpoziuma imeni akademika M.A. Usova studentov i molodykh uchenykh,

posvyashchennogo 110-letiyu so dnya osnovaniya gorno-geologicheskogo

obrazovaniya v Sibiri (International Symposium named after Academician

M.A. Usov of students and young scientists, devoted to the 110th anniversary

of the founding of mining and geological education in Siberia), Tomsk, 2012,

pp. 252–254.

5. Prozorovich G.E., Pokryshki zalezhey nefti i gaza (Cap rocks of oil and gas

deposits), Moscow: Nedra Publ., 1972, 117 p.

6. Bondarenko P.M., Zubkov M.Yu., Forecast of secondary fracture zones on

the basis of seismic prospecting and tectonic-physical modeling (In Russ.),

Geologiya nefti i gaza = The journal Oil and Gas Geology, 1999, no. 11 – 12,

pp. 31–40.

The article shows the prospects of search new deposits in the Western part of Bobrovsko-Pokrovsky arch within Buzuluk license area. The main source for the analysis is the results of many years of work of the departments of development, exploration and research center of core in TNNC LLC, providing fields of Orenburgneft JSC. A survey of geologic data was made and prospective reservoirs were determined. Up to 2016 it was considered that a large part of Bobrovsko-Pokrovsky arch, especially its western part, not very promising for the search of oil deposits in carbonate upper Devonian. This belief was confirmed by negative test results. It should be noted that all tests were conducted in the most high amplitude morphologically expressed structures, and, as it turned out, hypsometrically a high-positioned layers are not always productive. The spatial distribution of barrier reefs in the middle Famennian – Zavolzhsky and early Famennian age was predicted in this work. The range of oil-bearing deposits, confined to the reefs of different ages was revised. Areas for the search of new deposits in the Zavolzhsky and Middle Famennian sediments were recognized and predicted. According to comparison analysis of the prospects of search for new deposits for conversions and inclusion, the Visean epoch is the most preferable at all fields of Bobrovsko-Pokrovsky arch. The Famennian sediments are the most prospects for reserves and production. The productivity of these reservoirs can be confirmed only by drilling wells. The sidetrack deeping at the Tananykskoye field was due to new pool discovery in upper Famennian sediments. The use of the identified patterns will allow to increase the efficiency of exploration. This is the reason for a new and promising direction of search of oil deposits on Bobrovsko-Pokrovsky arch in the fields controlled by lower Famennian reefs.

References

1. Shakirov V.A., Deryushev D.E., Ivanov M.A., Sereda I.A., Current results of

overlooked targets identification in the fields of the Orenburg region (In Russ.),

SPE 176606-RU, 2015.

2. Dentskevich I.A., Oshchepkov V.A., Patterns of placement of deposits of oil

in the flank of Muhanovo-Erohovskiy deflection (In Russ.), Geologiya nefti i

gaza = The journal Oil and Gas Geology, 1989, no. 5, pp. 21–23.

3. Postoenko P.I., Cherepanov A.G., Prospects of oil bearing Frasnian - Lower

Famennian deposits in the south-east of the Volga-Kama anteclise (In Russ.)

Geologiya nefti i gaza, 1992, no. 2, pp. 28–32.

4. Gorbovskaya O.A., Demidova E.A., Geologicheskoe stroenie Bobrovskogo

mestorozhdeniya i usloviya zaleganiya nefti v plaste BII (bobrikovskiy gorizont)

(The geological structure of the Bobrovsky f ield and conditions of occurrence

of oil in the reservoir BII (Bobrikovian)), Proceedings of XVI Mezhdunarodnogo

simpoziuma imeni akademika M.A. Usova studentov i molodykh uchenykh,

posvyashchennogo 110-letiyu so dnya osnovaniya gorno-geologicheskogo

obrazovaniya v Sibiri (International Symposium named after Academician

M.A. Usov of students and young scientists, devoted to the 110th anniversary

of the founding of mining and geological education in Siberia), Tomsk, 2012,

pp. 252–254.

5. Prozorovich G.E., Pokryshki zalezhey nefti i gaza (Cap rocks of oil and gas

deposits), Moscow: Nedra Publ., 1972, 117 p.

6. Bondarenko P.M., Zubkov M.Yu., Forecast of secondary fracture zones on

the basis of seismic prospecting and tectonic-physical modeling (In Russ.),

Geologiya nefti i gaza = The journal Oil and Gas Geology, 1999, no. 11 – 12,

pp. 31–40.



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