Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10882410.54859/kjogi108824Research ArticleCreation of a PVT model for a reservoir under data uncertaintyDukessovaNadezhda K.n.dukessova@kmge.kzhttps://orcid.org/0009-0009-7198-731XKunzharikovaKlara M.<p>Cand. Sc. (Engineering)</p>k.kunzharikova@kmge.kzhttps://orcid.org/0009-0002-5121-0123AbekeshGulbakyt Zh.g.abekesh@kmge.kzhttps://orcid.org/0009-0006-2242-739XBektasGaukhar Zh.g.bektas@kmge.kzhttps://orcid.org/0000-0002-5991-7978BissikenovaLaura M.l.bissikenova@kmge.kzhttps://orcid.org/0009-0008-6294-7773YeltayGyuzel G.g.yeltay@kmge.kzhttps://orcid.org/0000-0003-3547-767XKMG Engineering26092025731051152502202522082025Copyright © 2025, Dukessova N.K., Kunzharikova K.M., Abekesh G.Z., Bektas G.Z., Bissikenova L.M., Yeltay G.G.2025<p><strong>Background</strong><strong>: </strong>PVT modeling is a critical step in reserve estimation and reservoir simulation of oil and gas fields. Accurate reproduction of fluid properties under different pressure–temperature conditions increases confidence in calculations and improves production forecasts. The accuracy of a PVT model largely depends on the quality of laboratory fluid data, while inconsistencies or errors in experimental results can reduce the reliability of calculated parameters.</p> <p><strong>Aim</strong><strong>: </strong>To evaluate the quality and reliability of laboratory data on reservoir fluids from the Cretaceous horizons and to validate consistent PVT regions for model development.</p> <p><strong>Materials</strong><strong> and methods:</strong> The quality and reliability of laboratory studies were evaluated using PVTsim software and methodological guidelines for validating reservoir fluid properties, where fluid composition and properties were analyzed based on equations of state.</p> <p><strong>Results</strong><strong>: </strong>Analysis of bottomhole and recombined samples showed clear relationships between reservoir fluid properties. Several PVT regions with distinct characteristics were identified. Comparison of simulation results with laboratory data revealed discrepancies, particularly in the measured density of Albian horizon oil. Reservoir oil parameters were adjusted using the PVT model.</p> <p><strong>Conclusion</strong><strong>:</strong> This approach removed unreliable laboratory data, provided a more accurate description of reservoir fluid properties, and updated calculation parameters to refine resource estimates.</p>bottomhole samplesrecombined samplesreservoir oil propertiesPVT model of reservoir fluidsequation of stateтереңдік сынамаларырекомбинацияланған сынамаларқабат мұнайының қасиеттеріқабат флюидтерінің PVT-моделікүй теңдеуіглубинные пробырекомбинированные пробысвойства пластовой нефтиPVT-модель пластовых флюидовуравнение состояния1.Yushchenko TS, Brusilovsky AI. A step-by-step approach to creating and tuning PVT-models of reservoir hydrocarbon systems based on the state equation. Georesources. 2022;24(3):164–181. doi: 10.18599/grs.2022.3.14. (In Russ).2.Brusilovskiy AI, Yushchenko TS. Two-phase deposits: Methodology approach to the identification of composition and PVT properties of reservoir hydrocarbon fluids using limited initial information. PROneft. Professionally about Oil. 2016;(1):68–74. (In Russ).3.KMG Engineering. Regulation on the justification of the properties and composition of reservoir fluid. Astana, 2022.4.Bylinkin GP, Guzhikov PA. Zavisimost’ svoystv plastovoy nefti ot vida razgazirovaniya. Russian Oil and Gas Geolody. 2008;3:31–36. (In Russ).5.Guzhikov PA, Kunzharikova KM, Uteubayeva YY. Methodological approaches to justification of reservoir oil properties for estimation of reserves. Kazakhstan journal for oil & gas industry. 2020;2(2):71–79. doi: 10.54859/kjogi95660.6.Bylinkin GP, Brusilovskiy AI. Novyy podkhod k otsenke stepeni nasyshchennosti plastovykh neftyanykh I gazokondensatnykh smesey I kriteriyev ikh phazovogo sostoyaniya. Russian Oil and Gas Geolody. 1991;9:14–18.