Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10879410.54859/kjogi108794Research ArticleDevelopment of an Integrated Approach to Assessing the Localization of the Residual Recoverable Oil Reserves to Enchance the Effectiveness of Geological and Technical Measures at the Uzen FieldTadzhibayevMaxat O.maxat.tazhibayev@dunga.kzhttps://orcid.org/0009-0005-3778-4843BayamirovaRyskol U.<p>Cand. Sc. (Engineering), Associate Professor</p>ryskol.bayamirova@yu.edu.kzhttps://orcid.org/0000-0003-1588-3144TogashevaAliya R.<p>Cand. Sc. (Engineering), Associate Professor</p>aliya.togasheva@yu.edu.kzhttps://orcid.org/0000-0002-5615-2711Dunga OperatingYessenov University110420257142531410202430012025Copyright © 2025, Tadzhibayev M.O., Bayamirova R.U., Togasheva A.R.2025<p><strong>Background: </strong>At later development stages of oil fields using reservoir pressure maintenance technology, residual recoverable reserves undergo significant transformation, evolving from a mobile to a low-mobile and, eventually, to an immobile state. These reserves are primarily concentrated in formations and reservoir zones that are not affected by water flooding. Identifying, localising, and developing such reserves are critical for maximizing the ultimate oil recovery factor in mature fields. This issue is particularly relevant for the Uzen field, which is characterized by a high depletion level and significant water cut. When combined, these factors necessitate the optimization of geological and technical measures.</p> <p><strong>Aim:</strong> To develop and justify an integrated approach to assessing the localisation of residual oil reserves at the late stage of field development.</p> <p><strong>Materials and methods:</strong> This approach implements methodology for the construction of depletion maps based on the analytical modelling of drainage radii of production wells, as well as analysis of changes in reservoir fluid mineralization based on laboratory measurement of the composition of produced and injected water. .</p> <p><strong>Results:</strong> The results of this study demonstrate that the developed approach is highly informative. It provides a detailed picture of distribution of residual oil reserves, allows for a quantitative assessment of how different zones are involved in development, and helps improve the efficiency of the waterflooding system.</p> <p><strong>Conclusion:</strong> The proposed integrated methodological approach is an effective tool for enhanced oil recovery in mature fields, which facilitate rational management of residual oil reserves and allows for systematic implementation of production stimulation measures in conditions of high field depletion.</p>localizationresidual recoverable reservesdepletion mapmineralization mapcurrent oil saturationthe Uzen fieldорналасуықалдық алынатын қорларөндіріс картасыминералдану картасықазіргі мұнай қанықтылығыӨзен кен орнылокализацияостаточные извлекаемые запасыкарта выработкикарта минерализациитекущая нефтенасыщенностьместорождение Узень1.Tajibaev MO. The Uzen field development project as of 01.01.2022, Aktau: KazNIPImunaygas; 2021. Contract No.: 1361-222. (In Russ).2.Tajibaev MO. Flood control. Aktau: KazNIPImunaygas; 2021. Report No.:12. Contract No.: 1361-222. (In Russ).3.Tajibaev MO. Review and approval of monthly GTMs. Aktau: KazNIPImunaygas; 2021. Report No.: 15. Contract No.: 1361-222. (In Russ).4.Sveshnikov AV, Kasenov AK, Zholdybayeva AT, Ibrayev AY. Optimal well spacing density in channel sandstones in the case of Uzen field. Kazakhstan journal for oil & gas industry. 2020;2(3):35–46. doi: 10.54859/kjogi95636.5.Ibrayev АY, Kazhykenkyzy A, Yelemessov AS, Nazaraly AZ. Approach to localization of residual recoverable reserves under conditions of high depletion on the example of Uzen field. Kazakhstan journal for oil & gas industry. 2019;1:26–37. doi: 10.54859/kjogi95524.6.Tajibaev MO. Construction of production maps based on the sampling and injection radius. Aktau: KazNIPImunaygas; 2021. (In Russ).7.Walcott D. Development and management of deposits during flooding. Moscow; 2001. 144 p.8.Pitkevich VG, Peshkov VY, Fedorov VK. Vliyaniye mineralizatsii zakachivaemoy vody na pronicaemost’ glinistykh plastov. Oil industry. 1978;7:14–18. (In Russ).9.Igdavletova M, Ismagilov T, Ganiev I, Telin A. The effect of mineralization of injected water on the permeability and oil recovery of reservoirs. Neftegaz.ru. Available from: https://neftegaz.ru/science/development/331660-vliyanie-mineralizatsii-/. (In Russ).10.Polyanskaya RY, Stadnikova NY. Vlyjaniye sostava zakachivaemykh vod na vytesneniye nefti iz produktivnogo plasta. Oilfield engineering. 1981;11: 28–31. (In Russ).