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.
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