Prestack Depth Migration Algorithms
WesternGeco has an extensive range of prestack migration algorithms able to handle all geological complexities and seismic acquisition environments and designs, including the latest full azimuth surveys.
RTM is an ultra high-end two-way wave-equation prestack migration for accurate imaging in and below areas with both great structural and velocity complexities.
Our wavefield extrapolation migration (WEM) produces premium imaging results using an optimized shot-profile downward-continuation prestack migration algorithm.
In areas where seismic acquisition is characterized by limited-azimuth geometries (for example, with regular towed-streamer marine acquisition), it may not be necessary to use a no-compromise azimuth compliant WEM prestack migration solution to generate final images or gathers for model updating.
Adaptive Beam Migration (ABM) is the WesternGeco implementation of a prestack depth migration based on Gaussian technology. It provides a high-end, full-beam prestack migration for situations demanding outstanding image quality and interpretation confidence.
The WesternGeco 3D Kirchhoff prestack depth migration is the most widely used prestack migration algorithm in the industry and sets the standard for depth imaging as a key component of the seismic toolbox.
Irregularities in acquisition geometry can result in the identification of acquisition footprints as anomalous amplitude and/or phase artifacts in seismic volumes. Conventional prestack migration normalization approaches are based on CMP fold; however, this does not take into account the spatial distribution of traces within, and in the vicinity of, the CMP bins.
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