Assessing Borehole Images and Cores in Sarvak Reservoir's Fractured and Non-fractured Zones

What is it about?

This study explores the reliability of core samples and borehole imaging logs in evaluating fractures and permeability in the Sarvak reservoir. Cores, while traditionally trusted, might not represent fractured zones well due to poor recovery. They're costly and have limitations in assessing fractures. Borehole imaging logs, especially high-resolution micro resistivity and acoustic imaging, are better suited to examine subsurface fractures. Comparing logs with cores verified their accuracy. Integrating Formation Micro-Imager (FMI) data with other logs allowed the creation of a permeability curve, providing insight into evaluating basement permeability. This research emphasizes the value of logs and highlights core limitations in water-based and oil-based mud systems.

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Photo by Dimitar Donovski on Unsplash

Photo by Dimitar Donovski on Unsplash

Why is it important?

This research holds significance as it challenges the reliability of traditional core samples as the sole standard for assessing reservoirs. Cores often fail to represent fractured zones well due to recovery issues and limitations in assessing permeability. Borehole imaging logs, particularly high-resolution micro resistivity and acoustic imaging, offer a more comprehensive view of subsurface fractures. By comparing logs with cores, this study confirms the accuracy of these imaging techniques. Moreover, integrating Formation Micro-Imager (FMI) data with other logs allows the creation of a permeability curve, offering insights into assessing basement permeability. Overall, this work showcases the value of log data while highlighting the limitations of core analysis in water-based and oil-based mud systems.

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