Multi-Azimuth Towed Streamer 3D Seismic in the Nile Delta, Egypt – Processing Solutions

摘要

A thin but complex layer of partially eroded anhydrite and other facies lie at a depth of around 3km across large areas of the Nile Delta in the Mediterranean. Wavefield distortion, attenuation and the generation of complex multiple diffraction noise cause the quality of the underlying seismic image to be highly variable. Multi-azimuth (MAZ) seismic can help resolve these issues and improve the deep pre-Messinian image. Here we discuss the processing flow and initial data analysis of a MAZ streamer dataset. The main elements of the flow used are a standard streamer demultiple followed by Kirchhoff PSTM. The initial data analysis shows that MAZ greatly improves general image quality, signal-to-noise ratio and lateral resolution, and suppresses diffracted and other multiples effectively, despite some of the obvious limitations of the processing flow. Issues and challenges around this approach are discussed.