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<p>The Aradeiba Formation plays a dual role as both a secondary reservoir and an effective seal in the Muglad Rift Basin, deposited in fluvio-deltaic and lacustrine environments. This study focuses on the Aradeiba D-Sand within the Simbir West oilfield, exploring its sedimentology, heterogeneity, and reservoir quality through a multi-scale approach. By integrating wireline well logs, core analyses, and advanced petrographic techniques, including Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Quantitative Evaluation of Minerals by Scanning Electron Microscopy, and X-ray Diffraction. The Aradeiba D-Sand comprises channel point bars, overbank, and crevasse splay deposits. The sandstones vary from fine- to very coarse-grained feldspathic arenites to wackes, with an average clay volume of 0.28 and an effective porosity of 22%. Permeability ranges significantly (0.3–893&#xa0;mD), influenced by grain size distribution and diagenetic alterations. Five hydraulic flow units (HFUs) were identified, with HFU-1 and HFU-2 demonstrating higher reservoir quality, primarily due to the preservation of intergranular porosity and minimal diagenetic modification. In contrast, lower-quality HFUs are affected by finer grain sizes, compaction, and cementation, while feldspar dissolution enhances secondary porosity in certain intervals. These findings highlight the interplay between depositional textures and diagenetic modifications, which influenced reservoir heterogeneity and quality. This study not only enhances our understanding of the evolution of the Aradeiba D-Sand but also provides a framework for evaluating similar reservoirs in the Muglad Basin and other rift basin settings.</p>

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Multi-scale characterization of the Aradeiba D-sand reservoir in the Muglad Rift Basin, Sudan: implications for reservoir heterogeneity and quality

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Ibrahim M. Yousif,
  • Matthew Nton,
  • Osman Abdullatif,
  • Sikiru Amidu,
  • Abdelrhim Eltijani

摘要

The Aradeiba Formation plays a dual role as both a secondary reservoir and an effective seal in the Muglad Rift Basin, deposited in fluvio-deltaic and lacustrine environments. This study focuses on the Aradeiba D-Sand within the Simbir West oilfield, exploring its sedimentology, heterogeneity, and reservoir quality through a multi-scale approach. By integrating wireline well logs, core analyses, and advanced petrographic techniques, including Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Quantitative Evaluation of Minerals by Scanning Electron Microscopy, and X-ray Diffraction. The Aradeiba D-Sand comprises channel point bars, overbank, and crevasse splay deposits. The sandstones vary from fine- to very coarse-grained feldspathic arenites to wackes, with an average clay volume of 0.28 and an effective porosity of 22%. Permeability ranges significantly (0.3–893 mD), influenced by grain size distribution and diagenetic alterations. Five hydraulic flow units (HFUs) were identified, with HFU-1 and HFU-2 demonstrating higher reservoir quality, primarily due to the preservation of intergranular porosity and minimal diagenetic modification. In contrast, lower-quality HFUs are affected by finer grain sizes, compaction, and cementation, while feldspar dissolution enhances secondary porosity in certain intervals. These findings highlight the interplay between depositional textures and diagenetic modifications, which influenced reservoir heterogeneity and quality. This study not only enhances our understanding of the evolution of the Aradeiba D-Sand but also provides a framework for evaluating similar reservoirs in the Muglad Basin and other rift basin settings.