Source & Receiver Corrections
Source designature and removal of receiver positioning errors enhance results of subsequent workflows
Eliminating variations in the seismic wavelet caused by irregularities in acquisition geometry and other aspects of acquisition is a vital step in any seismic data processing workflow. Numerous processing steps rely on assumptions of regular geometry, while confidence in many amplitude-dependent processes (such as AVO and inversion) requires stability and control of the wavelet characteristics.
This accurate shot-by-shot designature accounts for variations in the source signature from shot to shot, caused by perturbations in wave height, gun pressure, array geometry, and dropouts.
Building on the detailed knowledge of far-field source signatures provided by the CMS process, this source designature creates a common signature for every emergent angle for each recorded source—a prerequisite for subsequent AVO and inversion workflows—ensuring an enhanced amplitude fidelity for data recorded at high offset-to-depth ratios.
This process effectively removes errors due to continuous receiver movement after the source is fired during marine towed-streamer seismic acquisition.
Water velocity decomposition (WVD), our primary approach to WVC, accounts for changes over time in sea conditions, such as water temperature and salinity, that alter the velocity of the seismic signal travelling through the water layer.
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