А.V. Shakhov, O.V. Elisheva, N.N. Kondrashova, U.V. Shilova, M.N. Melnikova
DOI: https://doi.org/10.25689/NP.2024.3.67-95
Abstract
The interest in hydrocarbon accumulations in the interval of the Pre-Jurassic basement of the West Siberian Basin is not fading, despite the fact that most of the discoveries in this interval are still unsystematic. In most cases, only a few reservoirs are put into commercial development, the reason being the difficulties related to reservoir prediction and their localization in geospatial space. Specialists solve the problem using different approaches. In this paper, one of the approaches is proposed based on the integration of well data and 3D CDP seismic materials. It was used on the Kirilkinsky Area of the Uvat District in the south of the Tyumen Region, where oil accumulations have been discovered in the volcanic rock of the Triassic. To implement the approach, the general structure of the Pre-Jurassic interval was studied as part of the work. In the zone of the volcanic rock development within which is adjacent to the bottom of the sedimentary cover, the interval of the Pre-Jurassic basement is divided into two levels: the lower one is the unchanged rocks of various composition, and the second one is the rocks that have undergone secondary metasomatic change. According to the material composition analysis, six main macro-petrotypes have been identified. Five of them are classified as reservoirs of varying properties, and one is classified as non-reservoir. In uncored wells, the material composition was restored using neural network modeling based on Kohonen maps. To interpret net reservoirs, an approach was used based on a comparison of the inflow profiles recorded in the perforated intervals, well logging interpretations, geophysical surveys, and electric microscanner data. The identified pore-vuggy type of reservoirs in the highly modified volcanic rock es made it possible to use the results of simultaneous inversion for net-reservoir prediction. The results of the study allowed to localize reservoir development zones within the Kirilkinsky Area in the interval of the Pre-Jurassic basement and to build seismogeological models of existing discoveries in order to book the reserves.
References
2. Elisheva O.V. The problem of weathering crust allocation in the roof of the pre–Jurassic foundation in the southern regions of the Central Uvat is one of the key risks of unsuccessful drilling of wells // Collection of scientific papers of TNNTS LLC. –issue 5, Tyumen: -2019. –pp. 58-65. (in Russian)
3. Dobrovolsky D.V. Hypergenesis and weathering crust // Izb. trudy. –T1. –Moscow: publishing house "Scientific world". -2007. -512 p. (in Russian)
4. Zhiltsova A.A., Isaev V.I., Korzhov Yu.V. Vertical geochemical zonality of oil and gas complexes (on the example of Rogozhnikovsky and Severo-Rogozhnikovsky deposits) // Izvestiya Tomsk Polytechnic University, -2013. – Vol.322, - pp.69-82. (in Russian)
5. Elisheva O.V., Shilova Yu.V., Sidorov D.A. and others. Typification of rocks of the Pre-Jurassic base by core and prediction of material composition using neural network modeling based on Kohonen maps // News of higher educational institutions. Oil and Gas. – 2022. – No. 5. – pp. 14-35. –
DOI 10.31660/0445-0108-2022-5-14-35. (in Russian)
6. Kohonen, T. Self-organizing maps: [neural modeling, variants of self-organizing maps, physiological interpretation of SOM, learning vector quantization, application of self-organizing maps, software tools for SOM] / T. Kohonen; translation translated from English by V. N. Ageev, edited by Yu. V. Tyumentsev. – Moscow: Binom. Laboratory of Knowledge, 2008. – 655 p. – Translated by: Self-organizing maps / Teuvo Kohonen. (in Russian)
7. Methodological recommendations for calculating geological reserves of oil and gas by the volumetric method.// Edited by V.I. Petersillier, V.I. Poroskun, G.G.Yatsenko. M-Tver: VNIGNI, NPC Tvergeofizika, 2003. (in Russian)
8. Bembel S.R., Efimov V. A. Petrophysical interpretation of geophysical studies of wells and a geological model of an object composed of metamorphic rocks // Publishing house "EAGE Geomodel LLC" 2015 pp. 96-115. (in Russian)
9. Malinin A.V., Zelenov A.S., Soshin S.S. and others. The experience of using nuclear magnetic logging to study the Achimov strata of Western Siberia//NTV Logging 2021 No.6(312) 5-21. (in Russian)
10. Dobryden S.V., Kornev V.A., Semenova T.V. Petrological dismemberment and inter-well correlation of sections of volcanogenic deposits // Oil industry 2021 June. (in Russian)
11. Shilova Yu.V., Elisheva O.V. The possibilities of an expanded GIS complex in rocks of the pre-Jurassic base during geological exploration in the Uvatsky district of the Tyumen region // NTV Karotazhnik: Tver, -2022, №6(320), - pp. 80-93. (in Russian)
12. Polushina D.A., Abdulin R.N., Rakhmatulina A.R. Investigation of rock fracturing by electric microscanning // Logger. – 2013. – № 10(232). – Pp. 43-57. (in Russian)
13. Dobrynin S.V., Stenin A.V. Assessment of permeability and dynamic porosity according to broadband acoustic logging (CABG) // NTV Logging. Tver, 2008, №4 (169) 45-49. (in Russian)
14. Kozyar V.F., Glebocheva N.K., Medvedev N.Ya. Isolation of permeable reservoir rocks according to the parameters of the Stonely wave (results of industrial tests)// NTV "Karotazhnik". Tver: GERS. 1999. Issue 56. pp. 52-59. (in Russian)
15. Ukhlova G.D., Varlamov S.N., Kos I.M. Construction of geological models of productive Neocomian strata of the central part of the West Siberian NGP based on a set of attributes of seismic recording // Geology, Geophysics and development of oil and gas fields, No. 10. 2006. pp. 78-91. (in Russian)
16. Bekrenev R.K., Dugarov G.A., Nefedkina T.V. Testing the optimization of the AVAZ inversion algorithm on synthetic data// Interexpo Geo-Siberia. 2021. Vol. 2. No. 1. pp. 354-361. (in Russian)
17. Marmalevsky N.Ya., Khromova I.Yu. et al. Examples of the application of duplex wave migration for the study of fracture zones // Zbirnik naukovikh prats UkrDGZI. 2012011. №4. С. 162-170. (in Russian)
19. Kondratiev, I.K. Methods of implementation and evaluation of the effectiveness of seismic inversion: Study guide / Kondratiev I.K., Ryzhkov V.I., Kissin Y.M., Shubin A.V. // Moscow: Publishing Center of Gubkin Russian State University of Oil and Gas. -2011. – 62 c. (in Russian)
Authors
А.V. Shakhov, Section Head, Dynamic Interpretation of Seismic Data, Tyumen Petroleum Research Center
79/1, Osipenko Str., Tyumen, 625000, Russian Federation
E-mail: avshakhov@tnnc.rosneft.ru
O.V. Elisheva, Expert in Geology, Hydrocarbon Potential Department, Tyumen Petroleum Research Center
79/1, Osipenko Str., Tyumen, 625000, Russian Federation
E-mail: ovelisheva@tnnc.rosneft.ru
Scopus author ID: 57112661300
SPIN: 9449-0683
ORCID: https://orcid.org/0000-0003-2823-3503
N.N. Kondrashova, Manager of the Department of Geology and Seismic Interpretation, Tyumen Petroleum Research Center
79/1, Osipenko Str., Tyumen, 625000, Russian Federation
E-mail: nnkondrashova@tnnc.rosneft.ru
U.V. Shilova, Head of the GIS and Core Interpretation Sector of the Exploration Support Department, Tyumen Petroleum Research Center
79/1, Osipenko Str., Tyumen, 625000, Russian Federation
E-mail: YVShilova@tnnc.rosneft.ru
M.N. Melnikova, Chief Specialist of the Department of Geology and Seismic Interpretation, Tyumen Petroleum Research Center
79/1, Osipenko Str., Tyumen, 625000, Russian Federation
E-mail: mnmelnikova@tnnc.rosneft.ru
For citation:
А.V. Shakhov, O.V. Elisheva, N.N. Kondrashova, U.V. Shilova, M.N. Melnikova Opyt prognoza kollektorov v kislykh effuzivakh triasa yuzhnoy periferii Zapadnoy Sibiri po dannym sinkhronnoy inversii [Applying simultaneous inversion data to predict net reservoirs in the Triassic acid volcanic rocks of the southern periphery of West Siberia]. Neftyanaya Provintsiya, No. 3(39), 2024. pp. 67-95. DOI https://doi.org/10.25689/NP.2024.3.67-95. EDN FCLRSD (in Russian)