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AAPG Bulletin, Preliminary version published online
Copyright © 2026. The American Association of Petroleum Geologists. All rights reserved.
DOI:10.1306/02032624050
Porosity
and permeability of Mauddud reservoirs in Raudhatain and Sabiriyah oilfields, Kuwait: interpretation of controlling processes
Porosity and permeability of Mauddud reservoirs in Raudhatain and Sabiriyah oilfields, Kuwait: interpretation of controlling processesStephen N. Ehrenberg, Laura Galluccio, Boris Kostic, Gianluca Frijia, Sabry Abd El-Aziz, Nour Esam Alabboud, and Raja Ramalingam
Ahead of Print Abstract
porosity and permeability within the proximal, inner-ramp facies, but the more distal, muddier deposits have distinctly lower reservoir quality. Petrography reveals overall volumetric dominance of micropores over macropores. Karst surfaces are not observed in the studied cores, but meteoric water may well have been important during early diagenesis. Heterogeneity of reservoir quality results in large degree from heavily calcite-cemented nodules and thicker cemented zones, with the heavily cemented masses distinguished from surrounding porous limestone by the absence of oil staining. The nodular cementation was probably localized by burrowing and was partly supplied by early dissolution of locally concentrated aragonitic green algae. Field-wide compilations of core and log data reveal trends of upward porosity increase from the flanks to the crest of each field which are similar to the porosity trends of giant domal oilfields in Abu Dhabi and the North Sea, where late calcite cementation was inhibited by oil accumulation. The maximum crest-flank porosity difference due to late cementation is around ten volume percent. This study was performed to provide input for building reservoir models, but has broader significance for understanding the impact on reservoir quality of depositional environments, cemented nodules, sequence stratigraphy, and the preservation of crestal porosity by oil in many other microporous limestone reservoirs.
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