Gubkin Russian State University of Oil and Gas
Moscow, Russian Federation
CSCSTI 38.00
CSCSTI 37.00
Russian Classification of Professions by Education 05.00.00
Russian Library and Bibliographic Classification 26
Russian Trade and Bibliographic Classification 63
BISAC SCI SCIENCE
This article provides a thorough analysis of the potential for petroleum within the Pre-Jurassic Volcanic-Sedimentary Complex (PJVC) of the West Siberian Sedimentary Basin. Based on existing petrogenetic classifications of the complex's volcanic rocks, the article develops a model of major eruptive cycles, delineating the distribution of reservoir and non-reservoir rocks. To minimise uncertainty in inter-well correlation, the article proposes a methodology for rock discrimination using standard wireline logging suites. This incorporates fracture analysis to evaluate the likelihood of petrogenetic types belonging to the reservoir or non-reservoir categories. The integrated interpretation of seismic data, well logs, core petrography and lithology enabled cycle elements to be identified within the seismic field and surfaces to be constructed representing conditional geological bodies associated with natural reservoirs. Applying this workflow to a field in Western Siberia involving over 300 wells revealed that the PJVC comprises a series of ten lenticular packages exhibiting an imbricate lateral overlap pattern, ranging from a single package in the east to three superimposed packages in the northwest. Further investigation into the hydrodynamic connectivity between these units is required, however, as this is complicated by the high levels of lateral and vertical heterogeneity and faulting. This investigation is necessary in order to build a complete PJVC model that is suitable for field development planning and appraisal drilling. Nevertheless, this study establishes a foundational framework for the efficient investigation of similar rock complexes in the future.
volcanics, method of rocks classification by well LOGs, reservoir properties, pre-Jurassic complex, West Siberian Plate
1. Bonnichsen B. and Kauffman D. F. Physical features of rhyolite lava flows in the Snake River Plain volcanic province, southwestern Idaho // The Emplacement of Silicic Domes and Lava Flows. — Geological Society of America, 1987. — P. 119–145. — https://doi.org/10.1130/spe212-p119.
2. Brooks R. H. and Corey A. T. Hydraulic Properties of Porous Media. — Fort Collins, Colorado : Colorado State University Hydrology Papers, 1964. — 37 p.
3. Khisamutdinova A. I., Alekseeva P. A., Romanchuk A. F., et al. The Structure and Characteristics Forecast of the Pre-Jurassic’S Reservoir Rocks on One of Studied Area of the Elizarov Trough of the Frolov Megadepression According to 3D Seismic Data in the Absence of Borehole Information // Petroleum Geology. Theoretical and Applied Studies. — Saint Petersburg, 2021. — Vol. 16, no. 4. — P. 1–17. — https://doi.org/10.17353/2070-5379/38_2021. — (In Russian).
4. Khromova I. Yu., Kunin K. N., Kashcheev D. E., et al. Exploration and Oil Discovery in Pre-Jurassic Section of a Field in Western Siberia - A New Idea for the Mature Basin (Russian) // SPE Russian Petroleum Technology Conference. — Society of Petroleum Engineers, 2015. — P. 1–17. — https://doi.org/10.2118/176622-ru. — (In Russian).
5. Nemova V. D., Rostovtseva Yu. V., Bazhukova T. A., et al. Lithogenetic Classification as a Basis for Studying Complex Volcanogenic-Sedimentary Rocks Using the Example of Pre-Jurassic Complex Deposits in Western Siberia // Sedimentary Rocks - 2024. — Moscow : MAKS Press, 2024. — P. 84–86. — https://doi.org/10.29003/m4304.978-5-317-07292-6. — EDN: https://elibrary.ru/OSKXMR ; (in Russian).
6. Rostovtseva Yu. V., Nemova V. D., Nemchenko N. V., et al. Petrogenetic Typification of Acid Volcanics in the Roof of the Oil-Bearing Pre-Jurassic Complex of a Field in the Yelizarovsky Trough of the West Siberian Plate // Russian Journal of Earth Sciences. — 2025. — Vol. 25. — ES4013. — https://doi.org/10.2205/2025es001042. — EDN: https://elibrary.ru/DMLDTW ; (in Russian).
7. Smirnova M. E., Panchenko I. V., Kulikov P. Yu., et al. Structure, Rock Types, and Reservoir Properties of Altered Permian-Triassic Rhyodacites in Grabens of the Frolov Megadepression in Western Siberia // Lithology and Mineral Resources. — 2024. — Vol. 59, no. 2. — P. 206–233. — https://doi.org/10.31857/s0024497x24020065.
