Determination of Diagenetic Facies based on Petrophysical Logs in Heterogeneous Sarvak Reservoir in an Iranian Oil Field

Document Type : Research Paper

Authors

1 Faculty of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran

2 Faculty of Petroleum Engineering, Amirkabir University of Technology, Tehran, Iran\Mazandaran University of Science and Technology (Behshahr), Iran

3 Earth Science Department, Faculty of Natural Sciences, University of Tabriz, Iran

4 Sarvak Azar Engineering and Development Company (SAED), Iran

Abstract

In this study, the significant diagenetic processes in the Sarvak reservoir of an oil field located in the Dezful Embayment were studied from petrographic and petrophysical point of view. Therefore, after studying the thin sections provided by cores and cutting and preparing related diagenetic logs, it was determined that the main diagenetic processes affecting the reservoir quality include cementation, dissolution, dolomitization, and compaction. In addition, petrophysical logs were studied, and then porous zones were distinguished from other parts using VDL, SPI, and dolomite volume logs. Some input logs including secondary porosity, effective porosity, dolomite mineral volume, and VDL logs were used to determine diagenetic electrofacies. Accordingly, eight diagenetic facies codes were identified using the MRGC clustering method. This study indicates that dolomitization had both constructive (Facies 1) and destructive (Facies 2) effects on reservoir quality in different zones. Moreover, secondary porosity causes the development of high reservoir quality facies (Facies 6). Some facies (Facies 3, Facies 4, and Facies 5) have low reservoir quality due to a lack of developing dissolution and dolomitization. In addition, low porosity intervals include high compaction features (solution seam and stylolite). Based on this study, it is possible to construct diagenetic electrofacies indicating the different diagenetic processes and dividing rocks to related rock types.

Keywords

Main Subjects

References

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Journal of Petroleum Research
Volume 33, 1402-4 - Serial Number 131
November and December 2023
Pages 91-105

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