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Three methods of demigration based on the Kirchhoff merbod. the Eikonal equation and anisotropic ray rracing are tested, In all cases. except for the presence of severe lateral velocity variations, the results of the Kirchhoff method and anisotropic ray tracing are identical and restore the exact zero-offset section. The demigration using the Eikonal equation does nor always restere the real zero-offset section. On the ether hand. the rapidity of the Kirchhoff method allows us 10 use it effectively on workstations. Using 20 and 30 real seismie data, we show the practical implicarions of the use of demigration during the processing and interpretation of seismie data.

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Wide Azimuth Towed Streamer (WATS) acquisition has already proved to be a key technique in improving seismic imaging, especially in complex areas such as sub-salt plays. In 2006, a WATS field experiment was conducted in a deep water area of the Gulf of Mexico. The main purpose was to challenge recently developed 3D processing algorithms and find the most suitable processing strategy for a wide azimuth dataset. The results indicate that a 3D shot based processing sequence is an effective solution that accommodates the effects related to the multi-pass acquisition method and realizes the full benefit of the recorded 3D wide azimuth wave field.