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<p>The Late Cretaceous Matulla Formation consists of interbedded sandstones, limestones, and shales, is the major reservoir unit of the Ras Budran Field, Egypt, in the tectonically complicated Gulf of Suez Basin. This locally important formation has been the target of limited integrated stratigraphic-petrophysical characterization in the documented record. The goal of this study is to resolve the internal heterogeneity and reservoir architecture of the Matulla Formation using sequence stratigraphy and petrophysical analysis from four wells (RB-A2, RB-A7, RB-B2, and RB-C4). A third-order depositional sequence is recognized and subdivided into lowstand-, transgressive- as well as highstand-systems tracts. Petrophysical analysis reveals five major reservoir zones, primarily in sandstone facies, with satisfactory reservoir qualities and overall porosities ranging from 15 to 19%, effective porosities ranging from 12 to 18%, and hydrocarbon saturations ranging from 55 to 65%. Vertical and lateral lithofacies variation is a reflection of syn-depositional tectonics and accommodation fluctuation that influence reservoir quality and stratigraphic trapping potential. Our results underpin the importance of integrating stratigraphic frameworks with petrophysical interpretation to further predict syn-rift reservoir quality. They are relevant not only to the Suez Basin but also to similar rifted passive margin basins globally, and thus have broader implications for exploration in under-exploited Cretaceous sandstone plays.</p>

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Matulla reservoir in the Ras Budran Field, offshore Gulf of Suez Basin: sequence stratigraphy and petrophysical evaluation

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Abdelhamid M. Salman,
  • Mohammad A. Sarhan,
  • Mohamed M. Elhossainy

摘要

The Late Cretaceous Matulla Formation consists of interbedded sandstones, limestones, and shales, is the major reservoir unit of the Ras Budran Field, Egypt, in the tectonically complicated Gulf of Suez Basin. This locally important formation has been the target of limited integrated stratigraphic-petrophysical characterization in the documented record. The goal of this study is to resolve the internal heterogeneity and reservoir architecture of the Matulla Formation using sequence stratigraphy and petrophysical analysis from four wells (RB-A2, RB-A7, RB-B2, and RB-C4). A third-order depositional sequence is recognized and subdivided into lowstand-, transgressive- as well as highstand-systems tracts. Petrophysical analysis reveals five major reservoir zones, primarily in sandstone facies, with satisfactory reservoir qualities and overall porosities ranging from 15 to 19%, effective porosities ranging from 12 to 18%, and hydrocarbon saturations ranging from 55 to 65%. Vertical and lateral lithofacies variation is a reflection of syn-depositional tectonics and accommodation fluctuation that influence reservoir quality and stratigraphic trapping potential. Our results underpin the importance of integrating stratigraphic frameworks with petrophysical interpretation to further predict syn-rift reservoir quality. They are relevant not only to the Suez Basin but also to similar rifted passive margin basins globally, and thus have broader implications for exploration in under-exploited Cretaceous sandstone plays.