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Image log analysis of Asmari reservoir fractures in a Southwest Iranian oil field

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Abstract

Research on petroleum structures necessitates the investigation of reservoir rock fractures during field production and development phases and the use of software specifically designed for reservoirs. The present research aims to systematically investigate fractures in the Asmari reservoir, how these fractures develop using FMS and FMI image logs, and the effect of these fractures on the porosity and permeability of these reservoirs. The results indicate the viability of these logs as tools for detecting fractures and structural reservoir dips where water-based drilling mud is used. The present research incorporates the results obtained from FMI interpretations of two wells in the field under study for comparison. In general, production in the Asmari reservoir relies on a combination of fractures and rock matrices. Fractures and porous zones have a substantial effect on the properties of the reservoir rock. Also, two general patterns of tectonic fractures from longitudinal and oblique folding, as well as various other fractures arising from faulting, can be observed in this reservoir. Of these folds, the longitudinal pattern is the most frequent, as it forms the most open fractures extending to N35–65 W. These fractures are primarily observed in the Asmari higher zones (particularly Zone 1).

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Acknowledgements

The authors would like to thank Islamic Azad University of Shiraz for their support.

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Authors and Affiliations

  1. Department of Geology, Shiraz Branch, Islamic Azad University, Shiraz, Iran

    Seyyed Attaallah Seyed, Kouros Yazdjerdi & Abdolmajid Asadi

  2. Department of Petroleum Engineering, Gachsaran Branch, Islamic Azad University, Gachsaran, Iran

    Hossein Tabatabaei

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  1. Seyyed Attaallah Seyed
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  2. Kouros Yazdjerdi
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  3. Abdolmajid Asadi
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  4. Hossein Tabatabaei
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Correspondence to Kouros Yazdjerdi.

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Seyed, S.A., Yazdjerdi, K., Asadi, A. et al. Image log analysis of Asmari reservoir fractures in a Southwest Iranian oil field. Carbonates Evaporites 37, 5 (2022). https://doi.org/10.1007/s13146-021-00747-0

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