Kazakhstan journal for oil & gas industryKazakhstan journal for oil & gas industry2707-42262957-806XKMG Engineering10876810.54859/kjogi108768Research ArticlePVT Data Evaluation and Geochemical Fingerprinting: Approaches and ResultsDukessovaNadezhda K.N.Dukessova@niikmg.kzhttps://orcid.org/0009-0009-7198-731XKunzharikovaKlara M.k.kunzharikova@kmge.kzhttps://orcid.org/0009-0002-5121-0123BissikenovaLaura M.l.bissikenova@kmge.kzhttps://orcid.org/0009-0008-6294-7773BektasGaukhar Zh.G.Bektas@kmge.kzhttps://orcid.org/0000-0002-5991-7978KMG Engineering110420257179890907202423012025Copyright © 2025, Dukessova N.K., Kunzharikova K.M., Bissikenova L.M., Bektas G.Z.2025<p><strong>Background: </strong>This article examines the importance of reliable PVT data on reservoir fluid properties for calculating oil and gas reserves, as well as for making informed decisions during the design and operation of fields, using the example of the suprasalt complex of the Uaz structure. This structure is divided by tectonic faults into three flanks: southwestern, southern, and northeastern. The southern flank is separated by a feathering fault into two fields – western (Uaz Main) and eastern (Uaz East). The northeastern flank contains the Uaz North field. Over different years, PVT studies and geochemical studies (fingerprinting) have been conducted at these three fields to confirm the data.</p> <p><strong>Aim:</strong> The purpose of this work is to evaluate data from PVT studies and geochemical fingerprinting, to identify differences and similarities in reservoir fluid properties for three fields: Uaz Main, Uaz East and Uaz North.</p> <p><strong>Materials and methods: </strong>The study used data from PVT surveys conducted in different years at the three fields, as well as geochemical studies to confirm the data obtained, including the fingerprinting method. All data were used to analyze differences and similarities in fluid characteristics.</p> <p><strong>Results:</strong> The results of the analysis allowed us to identify differences and similarities in reservoir fluid properties, which contributes to more accurate data interpretation and improved field development management.</p> <p><strong>Conclusion:</strong> The obtained PVT property data and geochemical study results contribute to improving the accuracy of reserve estimation and enhancing the efficiency of field development management using the example of the Uaz structure.</p>physicochemical properties of oilPVT properties of reservoir fluidsoil fingerprintingмұнайдың физикалық-химиялық қасиеттеріPVT қабат сұйықтығының қасиеттерімұнайдың фингерпринтингіфизико-химические свойства нефтиPVT свойства пластовых флюидовфингерпринтинг нефти1.Brusilovskiy AI, Promzelev IO. Actual problems of studies of hydrocarbon fi eld bedded systems. Vesti gazovoy nauki. 2013;1(12):41–45. (In Russ).2.Khaznapherov AI. Issledovaniye plastovykh neftey. Moscow: Nedra; 1987. 116 p. (In Russ).3.Nikulin SE. Functions between oil properties (surface and base). Exposition Oil & Gas. 2013;6(31):37–40. (In Russ).4.Metodika vypolneniya izmereniy «Analiz aromaticheskikh komponentov (alkil benzolov) v syroy nefti na mnogomernom gazovom khromatografe s dvumya plamenno-ioniziruyushchimi detektorami (LTM-MD-GC) MVI 5 №5-2020». (In Russ).5.Aboul-Kassim TAT, Simoneit BRT. Petroleum hydrocar-bon fingerprinting and sediment transport assessed by molecularbiomarker and multivariate statistical analyses in the EasternHarbour of Alexandria, Egypt. Mar. Pollut. Bull. 1995;30:63–73.6.Wang Z, Stout S. Oil spill environmental forensics. Fingerprinting and source identification. Amsterdam: Elsevier; 2007. 554 p.7.Whitson CH, Brule MR. Phase Behavior. Society of Petroleum Engineers; 2000. 240 p.