Multi‐Attribute Seismic Characterization of Cenomanian Tidal Depositional Systems Beyond the Tuning Limit: Sequence‐Stratigraphic Controls on Combination‐Trap Architecture and Field‐Development Optimization in North African Passive Margin Basins

The Cenomanian–Turonian tidal systems of the Upper Abu Roash “G” (ARG) Member, deposited on the North African shelf under Tethyan eustatic control, form an under‐characterized reservoir succession. In the West of Nile (WON) C&A fields, Beni Suef Basin, development has targeted structural closures alone, leaving this stratigraphic potential unexplored. Conventional 3D seismic data (∼140 ft tuning thickness) cannot image the ∼30 ft ARG sands, and the structural‐only model for WON‐C conflicts with its −6600 ft open‐contour oil‐down‐to (ODT) depth. Seismic spectral bluing (SSB) inversion raised the dominant frequency from 30 to 45 Hz, enabling multi‐attribute analysis (including RGB spectral decomposition) integrated with ARG depth‐structure maps and ODT values. RGB decomposition resolves the tidal‐channel morphology as a higher frequency channel flanked by tidal bars and a mudflat background, consistent with the ARG estuarine model; four attributes independently confirm the anomaly, ruling out an artifact. Sequence‐stratigraphic analysis places the system in the ARG's transgressive systems tract, where facies architecture supplies a lateral seal. ODT analysis identifies WON‐C as a combination structural‐stratigraphic trap, in contrast to the structural three‐way dip closure at WON‐A. Six proposed well and sidetrack locations, two structural and four stratigraphic, reduce development cost. This is the first seismic‐based facies characterization of ARG tidal architecture and trap reinterpretation in the Beni Suef Basin, with implications transferable to North African, Arabian, and South Atlantic plays.