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<p>Petrophysical analysis is the cornerstone of reservoir evaluation, providing critical insights despite its inherent complexity. This study examines the Neogene sediments along the Red Sea coast, from Wadi Khasheir to Ras Honkorab in southern Egypt, to assess their hydrocarbon potential and the factors influencing their evolution. A total of 311 rock samples were collected from 32 measured sections, with microfacies analysis conducted on 150 thin sections and petrophysical measurements performed on 185 plug samples representing different formations. High porosity was recorded in the conglomerate and greywacke petrofacies of the Miocene Ranga Formation, averaging 14.5%, with permeability values reaching up to 3806 mD and 3516 mD, respectively. Similarly, the boundstone microfacies of the Miocene Um Mahara Formation exhibited the highest porosity values, averaging 22.2%, with permeability reaching 1190 mD. Diagenetic pathways were significantly influenced by depositional characteristics, including composition in the greywacke and feldspathic arenite petrofacies, texture in the boundstone microfacies, and primary porosity. The presence of feldspars and interparticle pores enhanced secondary porosity and pore throat size through dissolution, while bitumen as a pore-filling material in Pliocene-Pleistocene sediments highlights their significance as potential hydrocarbon reservoirs in the subsurface. Furthermore, the tectonic configuration of the various sub-basins has played a crucial role in controlling sedimentation and diagenetic processes, shaping the reservoir characteristics of these Neogene formations.</p>

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Depositional and diagenetic drivers of heterogeneous reservoir quality in the Neogene strata of the Red Sea (Egypt)

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Ahmed Ali,
  • Ahmed Awad Abdelhady,
  • Ramadan S. A. Mohamed,
  • Douaa Fathy,
  • Mohamed Hashem,
  • Mohamed S. Ahmed,
  • Sherif M. Aboueldahab,
  • Mahmoud M. Khalil,
  • Mohamed H. Farag

摘要

Petrophysical analysis is the cornerstone of reservoir evaluation, providing critical insights despite its inherent complexity. This study examines the Neogene sediments along the Red Sea coast, from Wadi Khasheir to Ras Honkorab in southern Egypt, to assess their hydrocarbon potential and the factors influencing their evolution. A total of 311 rock samples were collected from 32 measured sections, with microfacies analysis conducted on 150 thin sections and petrophysical measurements performed on 185 plug samples representing different formations. High porosity was recorded in the conglomerate and greywacke petrofacies of the Miocene Ranga Formation, averaging 14.5%, with permeability values reaching up to 3806 mD and 3516 mD, respectively. Similarly, the boundstone microfacies of the Miocene Um Mahara Formation exhibited the highest porosity values, averaging 22.2%, with permeability reaching 1190 mD. Diagenetic pathways were significantly influenced by depositional characteristics, including composition in the greywacke and feldspathic arenite petrofacies, texture in the boundstone microfacies, and primary porosity. The presence of feldspars and interparticle pores enhanced secondary porosity and pore throat size through dissolution, while bitumen as a pore-filling material in Pliocene-Pleistocene sediments highlights their significance as potential hydrocarbon reservoirs in the subsurface. Furthermore, the tectonic configuration of the various sub-basins has played a crucial role in controlling sedimentation and diagenetic processes, shaping the reservoir characteristics of these Neogene formations.