Abstract

In 2017, Rosneft started pilot operations in the Osinsky sub-horizon, and the first industrial inflows were received. Further replication was complicated by a lack of understanding of the areal development of zones with better properties.

The Osinsky subhorizon is composed of sedimentary carbonate rocks-Dolomites and limestones with different filtration and reservoir properties in area and section. The majority of reservoirs are low-permeable with an average value of less than 2 MD. Void space in most cases is represented by pores and small cavities. Fractures have a zonal distribution.

Taking into account the complex structure and lithological heterogeneity, a complex petrophysical model was created taking into account the sedimentological features of the rocks of the Osinsky subhorizon. As the main approach, the J. Lucia method was chosen, based on the typing of voids that are closely related to the structural and textural features of carbonate rocks. Taking into account the limited knowledge of special GIS methods and the limited core research, at the time of model construction, the neural network training method was used for typing purposes, and standard (model) dependencies were adapted for a specific field.

Key words:

patch-reefs, Cambrian, Osinsky sub-horizon, reef facies, J. Lucia, Siberian platform

References

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Authors

E.N. Maksimova, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: lizaveta90@mail.ru

K.N. Chertina, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: KNChertina@tnnc.rosneft.ru

K.D. Bobylev, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: kdbobylev@tnnc.rosneft.ru

E.S. Zyuzev, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: ESZyuzev@tnnc.rosneft.ru

L.V. Torgashova, LLC «Tyumen Petroleum Research Center»
42, M. Gorky st., Tyumen, 625002, Russian Federation
E-mail: lvtorgashova@tnnc.rosneft.ru

O.A. Krokhaleva, LLC «Taas-Yuryakh Neftegazodobycha»
279, Baikalskaya st., Irkutsk, 664050, Russian Federation
E-mail: krokhalevaoa@tyngd.rosneft.ru

For citation:

Е.N. Maksimova, К.N. Chertina, К.D. Bobylev, Е.S. Zyuzev, L.V. Torgashova, О.А. Krokhaleva Litologicheskoe stroenie osinskogo podgorizonta i vyjavlenie perspektivnyh zon razvitija kollektorov po metodike Dzh. Lusia na primere Srednebotuobinskogo mestorozhdenija [Lithological structure of the Osinskian horizon and identification of potential reservoir development zones using J. Lusia’s method by the example of Srednebotuobinskoye field]. Neftyanaya Provintsiya, No. 1(25), 2021. pp. 18-40. DOI https://doi.org/10.25689/NP.2021.1.18-40 (in Russian)