Seismic-Based Detection of Stratigraphic Traps and Carbonate Mounds

Abstract

Abstract Tectonostratigraphic analysis using 3D seismic interpretation calibrated with borehole data was conducted as part of exploration effort and enabled the prediction of mid-Cretaceous depositional facies and reservoir architecture. The study helped to identify areas with hydrocarbon potential, within the Mauddud Member of the mid-Cretaceous Wasia Formation. Based on seismic stratigraphy and facies interpretation, in conjunction with structural restoration, stratigraphic architectural patterns were identified as complex carbonate mounds formed in a back-shelf setting. The carbonate mound architecture within the Mauddud Member exhibits high-amplitude discontinuous reflectors, truncation of clinoforms, and stratigraphic-dipping reflection patterns. Several styles of carbonate mounds were identified, including carbonate clinoforms prograding towards the southeast and carbonate build-ups developed as isolated lenses. Structural restoration is used to verify the syndepositional paleo-highs that are interpreted to be carbonate mounds. The carbonate clinoform dip-magnitudes as observed in borehole images are higher than the regional bedding dip. Clinoform dip-azimuth is similar to the 3D seismic observations.