L.A. Dubrovina, E.A. Ivanov, E.V. Smirnova, G.L. Rozbaeva, Yu.V. Reidik
Methodological approaches to identification of Achimov-type exploration targets in the Arctic zone of West Siberian north
DOI 10.47148/0016-7894-2024-2-41-50
Key words: Lower Cretaceous deposits; clinoform sequence; paleoshelf; paleoslope; exploration target; correlation.
For citation: Dubrovina L.A., Ivanov E.A., Smirnova E.V., Rozbaeva G.L., Reidik Yu.V. Methodological approaches to identification of Achimov-type exploration targets in the Arctic zone of West Siberian north. Geologiya nefti i gaza. 2024;(2):41–50. DOI: 10.47148/0016-7894-2024-2-41-50. In Russ.
Petroleum potential of Lower Cretaceous deposits in the study area is associated with the Sukhodudinsky and Nizhnekhetsky deposits. Following the new seismic interpretation project and historical data analysis, seismostratigraphic model is created that confirms the clinoform architecture of Sukhodudinsky and Nizhnekhetsky formations within the Arctic zone of West Siberian north. Based on the model of Neocomian clinoform structure of Western Siberia, the authors developed and tested a methodology of identification of the main elements in each clinoform cycle, they are paleoshelf edge line and paleoslope foot line. According to seismic time section analysis and maps of slope angle gradients, the lower and upper paleoslope break lines are determined, and a pattern of slope angle behaviour is identified for the paleoshelf edges and paleoslope foots formed. The authors recommend to measure angles of clinoform sequence boundaries after paleoreconstruction. They present a method for Achimov-type exploration target localization in the context of limited information in the underexplored regions of West Siberian north. The conventional surfaces were used in addition for analysis of time thickness of clinoform sequence; these surfaces are connecting the upper and lower slope break lines at the beginning and the end of the clinoform formation. Using the method proposed, zones of the expected reservoir occurrence are modelled. The efficiency of the developed method for Achimov-type exploration target localization in the context of limited information is confirmed by drilling new wells in the study area.
Lidia A. Dubrovina
Head of the Division
Tyumen Petroleum Research Center,
19, ul. Perekopskaya, Tyumen, 625003, Russia
e-mail: ladubrovina@tnnc.rosneft.ru
Evgeniy A.Ivanov
Head of the Department
Tyumen Petroleum Research Center,
19, ul. Perekopskaya, Tyumen, 625003, Russia
e-mail: eaivanov2@tnnc.rosneft.ru
Еkaterina V. Smirnova
Head of Sector
Tyumen Petroleum Research Center,
19, ul. Perekopskaya, Tyumen, 625003, Russia
e-mail: evsmirnova3@tnnc.rosneft.ru
Galina L. Rozbaeva
Candidate of Geological and Mineralogical Sciences,
Expert
Tyumen Petroleum Research Center,
19, ul. Perekopskaya, Tyumen, 625003, Russia
e-mail: GLRozbaeva@tnnc.rosneft.ru
Yuriy V. Reydik
Manager
PJSC Rosneft Oil Company,
35, ul. Dubininskaya, 115054, Moscow, Russia
e-mail: yu_reydik@rosneft.ru
1. Naumov A.L., Onishchuk T.M., Binshtok M.M. Features of Neocomian series formation in Middle Ob [Ob osobennostyakh formirovaniya razreza neokomskikh otlozhenii Srednego Priob’ya]. In: Geologiya i razvedka neftyanykh i gazovykh mestorozhdenii Zapadnoi Sibiri. Tyumen’: TII; 1977. pp. 39–49. In Russ.
2. Borodkin V.N., Kurchikov A.R. To The Problem Of Refining The Western And Eastern Boundaries Of The Achimov Clinoform Complex (West Siberia). Russian Geology and Geophysics. 2015;56(9):1281–1291. DOI: 10.1016/j.rgg.2015.08.005.
3. Catuneanu O., Galloway W.E., Kendall C.G.St.C., Miall A.D. Sequence stratigraphy: methodology and nomenclature. Newsletters on Stratigraphy. 2011;(44):173–245.
4. Rozbaeva G.L., Agalakov S.E., Marinov V.A., Dubrovina L.A., Loshachenko Yu.V., Smirnova E.V., Malyshev N.A., Komissarov D.K., Igol’nikov A.E. A Novaya stratigraficheskaya skhema ryazansko-aptskikh otlozheniy Payyakhskoy zony neftegazonakopleniya [A new stratigraphic scheme of the Ryazanian-Aptian strata of the Payakh petroleum accumulation zone]. Neftegazovaya Geologiya. Teoriya I Praktika. 2023;18(1). Available at: http://www.ngtp.ru/rub/2023/3_2023.html (accessed on 01.11.2023). In Russ.
5. Ershov S.V. Problems Of Selection And Correlation Of Stratotype Sections Of The Neocomian In West Siberia In The Context Of Its Clinoform Structure. Russian Geology and Geophysics. 2017;58(98):963–972. DOI: 10.1016/j.rgg.2017.07.007.
6. Ershov S.V. Sequence Stratigraphy Of The Berriassian-Lower Aptian Deposits Of West Siberia. Russian Geology and Geophysics. 2018;59(7):891–904. DOI: 10.1016/j.rgg.2018.07.011.
7. Kontorovich V.A. A Model Of The Geologic Structure And The Oil And Gas Prospects Of Neocomian (Berriasian-Lower Aptian) Sediments Of The West Siberian Arctic Regions And The Kara Sea Shelf. Russian Geology and Geophysics. 2020;61(12):1429–1447. DOI: 10.15372/RGG2020154.
8. Isaev A.V., Afanasenkov A.P., Polyakov A.A., Khilko I.A., Chikishev A.A. The Clinoform Complex Of The Yenisei-Khatanga Regional Trough: The Structure And Oil Potential. Russian Geology and Geophysics. 2022;63(11):1320–1331. DOI: 10.2113/RGG20214399.
9. Isaev A.V., Krinin V.A., Karpukhin S.M. Oil and gas perspectives of clinoform complex of Yenisey-Khatanga regional trough. Neftegazovaya Geologiya. Teoriya I Praktika. 2015;10(3). Available at: http://www.ngtp.ni/mb/4/31_2015.pdf (accessed on 01.11.2023). DOI: 10.17353/2070- 5379/31_2015. In Russ.
10. Trushkova L.Ya., Igoshkin V.P. Clinoforms as regional oil-gas objects, regularities of their occurrence, forecast of stratigraphic reservoirs in them. Neftegazovaya Geologiya. Teoriya I Praktika. 2008;3(2). Available at: http://www.ngtp.ru/rub/2/24_2008.pdf (accessed on 01.11.2023). In Russ.