Topalova T.E.
tetopalova@rn-gir.rosneft.ru
Graduated from the Tyumen Industrial Institute (1991), specialization "Geology and Exploration of Oil and Gas Fields".
Candidate of Geological and Mineralogical Sciences.
Manager of the LLC "RN‑Geology Research Development", Tyumen.
Area of scientific interests: geology, conceptual modeling, design of geological exploration work, lithology, sedimentology.
Author of 9 publications.
Stratigraphy and lithology
| Article # 25_2026 | submitted on 08/11/2026 displayed on website on 10/05/2026 |
| 17 p. | Rakitina A.M., Litvichenko D.A., Topalova T.E. |
| Lithologic and petrophysical characteristics of the Valanginian-Hauterivian shelf formations of the BG group in northern Western Siberia based on new wells core data | |
| This paper presents the results of a comprehensive analysis of core studies and geophysical data from poorly researched Akh Formation in northern Western Siberia. The scrutiny included studies of the reservoir properties of rocks, grain size analysis, and mineral composition of rocks and clays, thin-sections, and a sedimentological description. A conceptual diagram of the formation of sandy-silty strata in the upper part of the Akh Formation has been compiled, revealing promising level BG (Gydan) Group. A comprehensive analysis of core samples from four new exploration wells has documented a gradual transition from continental and coastal-marine settings in the eastern part of the research area to shallow-marine settings in the west. From bottom to top, deep-water rocks at the base of the Akha Formation transition to coastal-marine and coastal-continental settings. The results of thin-section and mineralogy investigations of rocks indicate the likely presence of a single provenance for the clastic material throughout the study area. Differences in grain size distribution indicate varying distances to the provenance. The dynamics of the sedimentary environment and water flow velocities clearly differentiate rocks by facies characteristics and filtration properties. The highest content of both sandy fractions and porosity and permeability values are characteristic of environments with highly dynamic aquatic environments–river channel facies and distributary delta channels. This research was conducted to clarify the prospects and directions for exploring for commercial oil and gas accumulations in Neocomian strata of the Tazov District. Keywords: Valanginian-Hauterivian strata of the level BG group, Akh Formation, core studies, lithological and petrophysical characteristics, facies features, filtration properties, Tazov District, northern Western Siberia. |
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| article citation | Rakitina A.M., Litvichenko D.A., Topalova T.E. Lithologic and petrophysical characteristics of the Valanginian-Hauterivian shelf formations of the BG group in northern Western Siberia based on new wells core data. Neftegazovaya Geologiya. Teoriya I Praktika, 2026, vol. 21, no. 4, available at: https://www.ngtp.ru/rub/2026/25_2026.html EDN: KRPYZQ |
References
Borodkin V.N., Kurchikov A.R. Stratigraphic and correlation basis of geological modeling of the Lower Cretaceous strata of the Gydan petroleum region in the North of Western Siberia Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2014, no. 3, pp. 12-19. (In Russ.). EDN: RXBQHP
Kontorovich V.A., Toropova T.N., Shcherbanenko V.M. Model of geological structure and petroleum perspective of Neocomian strata belonging to Gydan area (Underpim regional clinoform). Neftegazovaya Geologiya. Teoriya I Praktika, 2022, vol. 17, no. 4, available at: http://www.ngtp.ru/rub/2022/37_2022.html (In Russ.). DOI: 10.17353/2070-5379/37_2022
Kuznetsova A.V., Kostenevich K.A., Shirikova E.V. The reservoir geometry specific features for the deltaic sandstones of the Cretaceous strata in the north of the West Siberian petroleum province. Georesursy, 2024, vol. 26, no. 3, pp. 51-59. (In Russ.). DOI: 10.18599/grs.2024.3.7
Nezhdanov A.A. The main patterns of the seismic-stratigraphic complexes of the Neocomian of Western Siberia. Geophysical Methods in Justifying Oil Exploration Objects in the Central Regions of Western Siberia. Tyumen: ZapsibNIGNI, 1988, pp. 62-71. (In Russ.).
Taninskaya N.V., Shimanskiy V.V., Raevskaya E.G., Vasil'ev N.Ya., Nizyaeva I.S., Nugumanova A.A., Birin M.V., Gizdatullina I.I. Facial-paleogeographic reconstructions of the Valanginian-Hauterivian strata belonging to the Lower Cretaceous Gydan Peninsula and the western part of the Yenisei-Khatanga regional foredeep. Neftegazovaya Geologiya. Teoriya I Praktika, 2021, vol. 16, no. 1, available at: http://www.ngtp.ru/rub/2021/10_2021.html (In Russ.). DOI: 10.17353/2070-5379/10_2021
Kontorovich V.A., Toropova T.N., Shcherbanenko V.M. Model of geological structure and petroleum perspective of Neocomian strata belonging to Gydan area (Underpim regional clinoform). Neftegazovaya Geologiya. Teoriya I Praktika, 2022, vol. 17, no. 4, available at: http://www.ngtp.ru/rub/2022/37_2022.html (In Russ.). DOI: 10.17353/2070-5379/37_2022
Kuznetsova A.V., Kostenevich K.A., Shirikova E.V. The reservoir geometry specific features for the deltaic sandstones of the Cretaceous strata in the north of the West Siberian petroleum province. Georesursy, 2024, vol. 26, no. 3, pp. 51-59. (In Russ.). DOI: 10.18599/grs.2024.3.7
Nezhdanov A.A. The main patterns of the seismic-stratigraphic complexes of the Neocomian of Western Siberia. Geophysical Methods in Justifying Oil Exploration Objects in the Central Regions of Western Siberia. Tyumen: ZapsibNIGNI, 1988, pp. 62-71. (In Russ.).
Taninskaya N.V., Shimanskiy V.V., Raevskaya E.G., Vasil'ev N.Ya., Nizyaeva I.S., Nugumanova A.A., Birin M.V., Gizdatullina I.I. Facial-paleogeographic reconstructions of the Valanginian-Hauterivian strata belonging to the Lower Cretaceous Gydan Peninsula and the western part of the Yenisei-Khatanga regional foredeep. Neftegazovaya Geologiya. Teoriya I Praktika, 2021, vol. 16, no. 1, available at: http://www.ngtp.ru/rub/2021/10_2021.html (In Russ.). DOI: 10.17353/2070-5379/10_2021