Multi-azimuth Anisotropic Tomography and PreSDM of a North Sea Streamer Survey

In this work, we have performed model building and 3D PreSDM on P-wave data from an ensemble of 3D streamer surveys using multi-azimuth sectored processing, wherein the velocity is estimated by a multi-azimuth tomographic inversion scheme. This results in better resolution of localized heterogeneity that is usually left unresolved when using a conventional non-azimuthal tomographic approach. We compare the results with existing vintage data imaged using conventional tomography, as well as with work conducted last year on the associated OBC survey data, where the use of offset-vector-tile tomography was demonstrated. We note how rigorous handling of azimuths better constrains the lateral velocity variations and results in a better focused image in the Jurassic, especially of steep fault planes.