The article describes the main principles of estimating volumetric parameters of gas onshore deposits in low-permeable reservoirs of the Turonian stage that were formed as a result of long-term study of "over-Cenomanian" deposits at the fields of Rosneft Oil Company, in particular, at the largest Kharampurskoye oil and gas condensate field. Based on a detailed analysis of the section, the authors formulated recommendations for optimal logging suite, well testing and analysis of core taken from highly swellable clay rocks of the Kuznetsovskaya suite, as well as for complex interpretation of geological and geophysical data for estimating gas reserves in unconventional reservoirs that were previously considered as substandard. The authors substantiated an optimal development strategy and technology for low-permeable gas reservoirs of the Turonian age based on the cycle of conceptual design of infrastructure, geomechanical and dynamic modeling of the reservoir, taking into account the economic efficiency at each stage of the work. Recommendations for drilling and research work have also been substantiated. Based on the results of the study of the Kharampurskoye field, a special methodology for the development design and assessment of volumetric parameters of dry gas in the Turonian deposits makes it possible to increase the reliability of the obtained geological and petrophysical information, and to calculate initial gas in-place with a higher degree of accuracy. This, in turn, will make it possible to correctly substantiate an economically efficient strategy for the development of low-permeable Turonian gas deposits, as well as reduce technological and economic risks. And the proposed approaches to the development of a specific target will involve prospective areas of the Turonian gas deposits in Western Siberia into development.
References
1. Kiselev A.N., Oshnyakov I.O., Melikov R.F. et al., Aspects of the development of low-permeability gas reservoirs of Turonian age (In Russ.), SPE-191653-18RPTC-RU, 2018, DOI: https://doi.org/10.2118/191653-18RPTC-MS
2. Kudamanov A.I., Agalakov S.E., Marinov V.A., The problems of Turonian-early Coniacian sedimentation within the boundaries of the West Siberian plate (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2018, no. 7, pp. 19-26.
3. Popov A.P., Russian companies are ready to produce Turonian gas (In Russ.), Neftegazovaya vertikal', 2018, no. 2, pp. 59-62.
4. Mal'shakov A.V., Oshnyakov I.O., Kuznetsov E.G. et al., Innovative approaches to study heterogeneous anisotropic reservoirs of Turonian deposits for reliable assessment of reservoir properties (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 11, pp. 18–22.
5. Mal'shakov A.V., Oshnyakov I.O., Zhadeeva E.A. et al., Justification of microlayered Turonian age deposits petrophysical model for reliable reservoir properties assessment (In Russ.), SPE-182501-RU, 2016, DOI: https://doi.org/10.2118/182501-RU.
6. Agalakov S.E., Kudmanov A.I., Marinov V.A., Facies model of the Western Siberia Upper Cretaceous (In Russ.), Interekspo GEO-Sibir', 2017, V. 2, no. 1, pp. 101-105.
7. Metodicheskie rekomendatsii po podschetu zapasov nefti i gaza ob’emnym metodom. Otsenka kharaktera nasyshchennosti po dannym GIS (Guidelines for the calculation of reserves of oil and gas by volumetric method. Assessment of the nature of saturation according to well logging): edited by Petersil’e V.I., Poroskun V.I., Yatsenko G.G., Moscow – Tver: Publ. of VNIGNI, 2003, 261 p.
8. Kiselev A.N., Buchinskiy S.V., Yushkov A.Yu. et al., Pilot development of Turonian low-permeability gas reservoirs of the Kharampurskoye field (In Russ.), Vestnik OAO “NK “Rosneft”, 2015, no. 3, pp. 46-49.
9. Khakimov A.A., Kholkina Yu.D., Loznyuk O.A. et al., Improving the quality of predicted technological parameters of development by using integrated approach to modeling (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2021, no. 9, pp.82-85, DOI: 10.24887/0028-2448-2021-9-82-85
10. Loznyuk O.A., Surtaev V.N., Sakhan' A.V. et al., A multistage stimulation operation to unlock the gas potential of the Turonian siltstone formation in Western Siberia (In Russ.), SPE-176706-RU, 2015, DOI: https://doi.org/10.2118/176706-MS
