Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10875110.54859/kjogi108751Research ArticleFacies variability of sediments in the Jurassic productive strata of the Burmasha oilfieldNugmanovBackbolat Kh.<div class="QmZWSe"> <div class="DHcWmd">&nbsp;</div> </div>b.nugmanov@kmge.kzhttps://orcid.org/0009-0008-4418-3773AlexeyevaYekaterina V.e.alexeyeva@kmge.kzhttps://orcid.org/0009-0007-3754-1264Branch of KMG Engineering LLP KazNIPImunaigaz11042025718182305202428012025Copyright © 2025, Nugmanov B.K., Alexeyeva Y.V.2025<p><strong>Background:</strong> The foundation for field development and the justification of oil recovery factors relyies on a precise geological model. The reliability of this geological model depends on the specific characteristics of the deposit structure. Challenges in constructing the model arise from the significant lithological and facies variability of rocks. This article examines the structural features of the Yu-IX horizon of the Middle Jurassic Bajocian Stage of the Burmasha oilfield, incorporating new seismic data using the 3D common depth point (3D CDP) method and well drilling data.</p> <p><strong>Aim:</strong> Presentation of a new geological model of the productive strata of the Burmasha oilfield based on the 3D CDP and drilling data, and determination of sedimentation conditions during the deposit formation.</p> <p><strong>Materials and methods:</strong> The study applies new data from the interpretation of the 3D CDP seismic survey. It analizes cross slices of the eXchroma attributes, spectral decomposition (SD), RMC and Vp/Vs within the productive horizon, as well as drilling data from the entire well stock of the field.</p> <p><strong>Results:</strong> The study results in the clarification of the boundaries of paleorusic deposits of the productive horizon and the determination of the sedimentation conditions in the productive strata. The data obtained show the importance of using modern exploration methods to provide a reliable geological model.</p> <p><strong>Conclusion: </strong>The findings of this study provide a more accurate representation of the geological structure, estimate the reserves of hydrocarbon raw materials (hereinafter HRM), and enable further planning of a efficient system for the field development. All this will enhance the efficiency of hydrocarbon production, mitigate the risk of penetrating the clay-rich sections, and enable strategically position of new wells in areas with beneficial reservoir properties.</p>structureseismicsseismic explorationhorizonsandy bodyfaultқұрылымсейсмикалықсейсмикалық барлаугоризонтқұмды денежарылысструктурасейсмикасейсморазведкагоризонтпесчаное телоразлом1.Murzagaliyev D, Batukhin V. Report on the work of Seismic Party 32-33/64-65, which conducted the MOU research (SPF) within the Southern Mangyshlak on the squares of Zhalgana, Turkmenoy, Northern Zhetybai, Kokumbai in the Mangistau district of the Guryev region of the Kazakh SSR in 1965. Aktau: Fond «MNGR»; 1965. 72 p. (In Russ).2.eport on the work of seismic party 1/93 “Results of detailed seismic surveys of the MOGT in the area of Vostochny Zhetybai – Yuzhny Karamandybas in the Mangistau and Karakiyansky districts of the Mangistau region of the Republic of Kazakhstan. Aktau: Mangistaumunaygeofizika JSC; 1994. 54 p. (In Russ).3.Kirzeleva OY, Kiryanova TN, Fedorova MD. Paleo-channels and Paleo-rivers in Seismic Data (at the Example of Pay Yu3-4 of the Tyumen Suite at One of the Fields in Western Siberia). Neft. Gaz. Novatsii. 2021;4: 18–25. (In Russ).4.Suslov AA, Vaynerman BP. Allocation of paleochannels in sand-clay sediments of Middle Jurassic age in Petrel Software Complex. Proceedings of Higher Educational Establishments: Geology and Exploration. 2019;(6):26–31. doi: 10.32454/0016-7762-2019-6-26-31. (In Russ).5.Muromtsev VS. Elektrometricheskaya geologiya peschanykh tel – litologicheskikh lovushek nefti i gaza. Leningrad: Nedra; 1984. 260 p. (In Russ).6.Report on the results of processing and interpretation of data from the MOGT 3D seismic surveys performed within the contract territory of MMG JSC at the Burmash PU ZHMG field. Aktau: LLP «Professional Geo Solutions Kazakhstan»; 2020. 56 p. (In Russ).