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The reservoirs quality of the Lower Cretaceous Abu Graba Formation of Azraq area,Muglad basin,southwestern Sudan,is directly controlledby depositional facies-related carbonate cementation andcompaction.This study contains a subsurface facies analysis based on description of 190.4m conventional cores.Methods include wireline logging analysis,petrographic study with thin sections and SEM investigations,grain-size,X-ray diffraction,andheavy minerals analysis of the Abu Gabrasandstone.