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<p>The Lower Miocene Mus Formation represents an important carbonate reservoir in the Harir Oil Field, northern Iraq. This study aims to evaluate its reservoir characteristics and hydrocarbon potential using an integrated petrophysical analysis of wireline log data from the JSK-1 well. Lithological interpretation was conducted using neutron–density cross-plots, while shale volume, porosity, permeability, water saturation, and flow zone indicator (FZI) were quantitatively determined using standard log interpretation techniques. The results indicate that the Mus Formation is dominated by carbonate lithologies, mainly limestone and dolomitic limestone, with shale volume generally less than 10%, reflecting a clean reservoir system. Total porosity ranges from 3 to 12%, locally reaching 16%, whereas permeability varies significantly from &lt; 1 mD to approximately 400 mD, indicating strong heterogeneity. Enhanced reservoir quality is observed in the upper interval (1928–1940&#xa0;m), characterized by relatively higher porosity, permeability, and FZI values. Water saturation is generally high (70%), while hydrocarbon saturation reaches up to 30% within the main reservoir interval. Despite a total thickness of approximately 40&#xa0;m, the effective net pay is limited to about 2.1&#xa0;m. The novelty of this study lies in the integration of multi-log petrophysical analysis to delineate pay zones and characterize reservoir heterogeneity in a relatively underexplored Jurassic carbonate system in northern Iraq. These findings indicate that the Mus Formation is a tight, heterogeneous carbonate reservoir, with reservoir quality controlled by lithological variation and diagenetic processes. The integration of petrophysical parameters with FZI analysis provides a robust approach for identifying productive zones and improving reservoir characterization in carbonate systems.</p>

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Petrophysical evaluation and reservoir characterization of the Lower Jurassic Mus Formation using wireline logs: a case study from the Harir Oil Field, Kurdistan Region, Iraq

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Mahdi Khairi Aswad,
  • Nabaz Jawhar Qadr

摘要

The Lower Miocene Mus Formation represents an important carbonate reservoir in the Harir Oil Field, northern Iraq. This study aims to evaluate its reservoir characteristics and hydrocarbon potential using an integrated petrophysical analysis of wireline log data from the JSK-1 well. Lithological interpretation was conducted using neutron–density cross-plots, while shale volume, porosity, permeability, water saturation, and flow zone indicator (FZI) were quantitatively determined using standard log interpretation techniques. The results indicate that the Mus Formation is dominated by carbonate lithologies, mainly limestone and dolomitic limestone, with shale volume generally less than 10%, reflecting a clean reservoir system. Total porosity ranges from 3 to 12%, locally reaching 16%, whereas permeability varies significantly from < 1 mD to approximately 400 mD, indicating strong heterogeneity. Enhanced reservoir quality is observed in the upper interval (1928–1940 m), characterized by relatively higher porosity, permeability, and FZI values. Water saturation is generally high (70%), while hydrocarbon saturation reaches up to 30% within the main reservoir interval. Despite a total thickness of approximately 40 m, the effective net pay is limited to about 2.1 m. The novelty of this study lies in the integration of multi-log petrophysical analysis to delineate pay zones and characterize reservoir heterogeneity in a relatively underexplored Jurassic carbonate system in northern Iraq. These findings indicate that the Mus Formation is a tight, heterogeneous carbonate reservoir, with reservoir quality controlled by lithological variation and diagenetic processes. The integration of petrophysical parameters with FZI analysis provides a robust approach for identifying productive zones and improving reservoir characterization in carbonate systems.