Deghosting

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.

Conventional Broadband

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Ghost Wavefield Elimination (GWE)

  • Upgrade conventional legacy data to the appearance of broadband data to aid matching.
  • Broaden the bandwidth to provide sharper wavelets and improve visibility of impedance contrasts for enhanced interpretation.
  • Compensate for ghosts present in streamer data, within the constraints of the signal-to-noise ratio at low frequencies and in the ghost notches.
  • True broadband data, such as BroadSeis, requires all frequencies to be recorded with good signal-to-noise so that all ghost notches can be properly removed.

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.

3D Deghosting

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.

3D deghosting for full-azimuth and ultra-long...

Qiaofeng Wu | Chang-Chun Lee | Wei Zhao | Ping Wang | Yunfeng Li
©2014 SEG

Wave height guided multi-shot receiver deghos...

Gordon Poole | Simon King
©2016 SEG

Simultaneous source designature and receiver ...

Gordon Poole | Simon King | James Cooper
©2016 EAGE
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