Upon completion of the final reverse-time migration (RTM) imaging for a subsalt prospect in the deepwater Gulf of Mexico, interpreters noted conflicting dip information in a key area of prospectivity. If the conflicting dips were real, they would drastically affect the size of the reservoir and, consequently, the drilling plan. This paper summarizes a modeling and imaging study that used 3D acoustic finite-difference modeling to gain a better understanding of the events on the final RTM image. Based on the results of this study, we conclude that the dipping events are related to noise from residual multiples. The study also shows the role that long-offset and full-azimuth acquisition can have in illuminating complex subsalt targets.


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