The Miocene Asl Member in the North October Field, Gulf of Suez Rift, offers a well-exposed case study of syn-rift slope-apron sedimentation, where gravity-driven depositional processes, Syn-depositional faulting, and diagenetic evolution combine to create highly heterogeneous reservoirs. This integrated study synthesizes detailed core facies analysis, petrography analysis, structural interpretation, and dynamic production data to construct a predictive reservoir model linking facies architecture to reservoir performance. The methodology integrates 230 ft of conventional core description, thin-section petrography, SEM imaging, porosity–permeability measurements, and historical production data from three wells (GS172-2, GS183-1, and OCT-J5) to ensure quantitative and reproducible interpretation. Three principal facies associations: Facies A: sand-prone gravity flows, Facies B: heterolithic debris flows and Facies C: carbonate-rich deposits establish a complex stratigraphic framework, vertically partitioned by diagenetic baffles and laterally segmented by active growth faulting. Diagenetic processes, particularly feldspar dissolution and pervasive carbonate cementation, amplify contrasts in reservoir quality, controlling porosity-permeability distributions across facies. Structural and stratigraphic compartmentalization govern distinct pressure regimes and flow unit behavior, reflected in differential production responses between fault blocks. High initial oil production is sustained from clean, sand-prone compartments, while water breakthrough and rapid decline are strongly influenced by intra-reservoir heterogeneity. The Asl Member case study enhances understanding of how sedimentary, diagenetic, and structural factors interact to shape reservoir performance in syn-rift settings, providing a methodological framework applicable to other tectonically active rifted margins. The multi-disciplinary approach presented here offers an effective predictive framework for exploration and development strategies in structurally complex clastic reservoirs worldwide.