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<p>This study presents an integrated petrophysical evaluation of the Early Miocene Upper Rudeis reservoir within the Asl and Hawara formations in the western offshore July Field, Gulf of Suez. The study is supplemented by formation pressure measurements from RFT/MDT equipment and is based on wireline logs (gamma-ray, resistivity, density, neutron, and sonic), dipmeter data, and sophisticated petrophysical methods such as Pickett plot analysis and nuclear magnetic resonance (CMR) logging. The findings show that the two formations’ reservoir qualities differ significantly. The thinly laminated, fine-grained sandstones that make up the Asl Formation are interbedded with limestone and shale, which results in low effective porosity (generally &lt; 10%) and high water saturation (up to 100%), indicating poor reservoir potential. The Hawara Formation, on the other hand, shows more heterogeneity, with water saturation as low as 7% in cleaner sandstone intervals and effective porosity as high as 24%, indicating the potential hydrocarbon-bearing zones. While variations in bulk volume water (BVW) reflect changes in pore-size distribution and fluid behavior, Pickett plot analysis shows consistent formation water resistivity (Rw = 0.045 Ω&#xa0;m) and cementation exponent (m ≈ 2.0). Dipmeter measurements contribute to the observed heterogeneity by supporting the interpretation of gravity-driven and channelized depositional systems. By highlighting reservoir compartmentalization and restricted vertical connection, the integration of CMR and RFT/MDT data improves the evaluation of permeability and fluid distribution. The results show that lithological heterogeneity and depositional facies are the main factors influencing reservoir quality, with the Hawara Formation serving as the primary exploration target despite its discontinuous nature.</p>

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Reservoir Characterization of the Upper Rudeis Formation Using Petrophysical, Pressure Testing, and CMR Logs: A Case Study from the Western Offshore July Field, Gulf of Suez

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Abdelbaset M. Abudeif,
  • Hesham Zahra,
  • Miguel A. Santoyo,
  • Nouran S. Salama,
  • Nasir Alarifi,
  • Fathy Abdalla

摘要

This study presents an integrated petrophysical evaluation of the Early Miocene Upper Rudeis reservoir within the Asl and Hawara formations in the western offshore July Field, Gulf of Suez. The study is supplemented by formation pressure measurements from RFT/MDT equipment and is based on wireline logs (gamma-ray, resistivity, density, neutron, and sonic), dipmeter data, and sophisticated petrophysical methods such as Pickett plot analysis and nuclear magnetic resonance (CMR) logging. The findings show that the two formations’ reservoir qualities differ significantly. The thinly laminated, fine-grained sandstones that make up the Asl Formation are interbedded with limestone and shale, which results in low effective porosity (generally < 10%) and high water saturation (up to 100%), indicating poor reservoir potential. The Hawara Formation, on the other hand, shows more heterogeneity, with water saturation as low as 7% in cleaner sandstone intervals and effective porosity as high as 24%, indicating the potential hydrocarbon-bearing zones. While variations in bulk volume water (BVW) reflect changes in pore-size distribution and fluid behavior, Pickett plot analysis shows consistent formation water resistivity (Rw = 0.045 Ω m) and cementation exponent (m ≈ 2.0). Dipmeter measurements contribute to the observed heterogeneity by supporting the interpretation of gravity-driven and channelized depositional systems. By highlighting reservoir compartmentalization and restricted vertical connection, the integration of CMR and RFT/MDT data improves the evaluation of permeability and fluid distribution. The results show that lithological heterogeneity and depositional facies are the main factors influencing reservoir quality, with the Hawara Formation serving as the primary exploration target despite its discontinuous nature.