Pgs Geophysical As

Pgs Americas, Inc.

Yeashung Sonny Lin

Sverre Brandsberg-Dahl

Junru Jiao

John Frier Willis

Shu-Schung Lee

Chaoguang Zhou

A programmable computer is used to perform the following. 3D seismic data sets, corresponding to each azimuth in seismic data obtained from a multi-azimuth marine seismic survey, are migrated in grids oriented with the corresponding azimuth. Acquisition geometry is stored for each trace in the seismic data sets for each azimuth. Residual analysis, based on the corresponding azimuth, is performed on each of the migrated data sets, generating residuals and reflectors for each azimuth. The residuals and reflectors generated for each azimuth are rotated and merged on a master grid. Reflection tomographic inversion is applied iteratively to the rotated and merged residuals and reflectors to update a velocity model using the acquisition geometry as based on the master grid. The earth's subsurface is imaged using the updated velocity model.

Method for building velocity models for imaging in multi-azimuth marine seismic surveys

A method is disclosed for depth migrating seismic data. The method includes pre-stack time migrating the seismic data to form a stacked, time migrated image. The stacked, time migrated image is demigrated, and post-stack depth migration is then performed on the demigrated image. In some embodiments, the pre-stack time migration and the demigration account for ray bending in vertically transversely isotropic media.

Method for depth migrating seismic data using pre-stack time migration, demigration, and post-stack depth migration

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Sugar Land, TX, United States of America

Yeashung Sonny Lin