Abstract

In this paper, we present a recently completed, extensive finite-difference (FD) modeling study over the West Nile Delta area in Egypt. The primary objective was to analyze the impact of various acquisition geometries on the pre-Messinian image quality. We used an innovative methodology for building the velocity and density models representative of the complexity of the offshore Nile Delta. Synthetic data showed many of the challenging features observed on field data. This allowed us to meaningfully quantify the impact of various acquisition geometries on image quality. We found that a surprisingly determinant factor influencing the final image quality is the offset distribution of the contributing traces. As offset distributions can be adjusted after the fact by applying a suitable offset-dependent weighting to recorded data, we find that by making careful use of offset weighting we can reap some of the same benefits of more complex acquisition schemes with simpler acquisition design.

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