The source and receiver ghosts created in marine acquisition form a secondary wavefield that corrupts the recorded data, and whose appearance depends on offset, time and geologic dip.
There are three different processing stages where this secondary wavefield can be dealt with. The best approach to use can vary from project to project. The most common route is to remove the ghost pre-stack using Ghost Wavefield Elimination (GWE). If needed, we can instead deghost as part of the migration process or remove the ghost post-migration via mirror migration and joint deconvolution.
We provide a number of different processing algorithms and techniques for GWE, to deghost and broaden the bandwidth of all streamer data, including conventional flat and BroadSeis variable-depth. The optimal technique to use depends on the dataset and the objectives.
GWE is effective for most 2D and 3D data in NAZ or WAZ acquisition geometry. For FAZ data (such as those acquired by StagSeis) or reflections that exhibit strong 3D
effect (e.g. diffractions), however, a full 3D deghosting method is required for broadband processing. CGG’s 3D deghosting method uses a progressive sparse Tau-Px-Py inversion to perform 3D joint deghosting and crossline interpolation in one step, thereby overcoming
the issue of coarse and irregular crossline sampling.
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