I.I. Churochkin
Refinement of the secondary transformation model of carbonate reservoir: Case study of X oil field
DOI 10.47148/0016-7894-2025-2-105-112
Key words: carbonate reservoir; reef carbonate; diagenesis; karst; conceptual model; typing of secondary transformations; cavern porosity prediction; uncertainty.
For citation: Churochkin I.I. Refinement of the secondary transformation model of carbonate reservoir: Case study of X oil field. Geologiya nefti i gaza. 2025;(2):105–112. DOI: 10.47148/0016-7894-2025-2-105-112. In Russ.
Predicting the reservoir properties of a carbonate reservoir in the interwell space is a challenging task. In addition to the voids formed during the growth of a carbonate reef, the reservoir structure can be further complicated by diagenetic processes. When a carbonate reservoir reaches the surface, karst formations develop because of dissolution processes. Standard log interpretation in carbonate formations often fails to accurately identify reservoir intervals and estimate porosity, another major challenge is predicting the karst presence in the interwell space. To address these uncertainties, it is essential to integrate available geological and geophysical data. This paper presents an analysis of the carbonate karst in Object A of oil field X, which is located the Timan-Pechora Petroleum Province. Based on the integration of well log data, advanced logging methods, and core studies, a model of secondary transformations was developed, and the distribution of karst features was mapped. As a result of this integration, it was determined that reservoir intervals in the barrier zone are associated with the presence of caverns. Additionally, a classification of the main cavern types observed in reservoir microimager interpretations was created, including “sponge-like” caverns, large caverns, caverns along bedding surfaces, caverns along fracture planes. Based on these findings, a conceptual model of karst development was constructed.
Ilia I. Churochkin Scopus
Senior Engineer
Zarubezneft STC,
10, Dmitrovsky proezd, Moscow, 127422, Russia
e-mail: IChurochkin@nestro.ru
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Section: Oil and gas reservoirs