CRS-PreSTM/CRS-PreSDM - Noise Reduction in Seismic Imaging

With the CRS method the incoherent seismic energy (noise) can be strongly suppressed. The increased stacking/gather fold, and additional wavefield attributes used in the time and depth domain processing enhance the imaging quality in both domains. The CRS time domain processing provides the requisites for an enhanced prestack depth migration with high potential, especially for data with low acquisition fold or high noise levels, where the velocity model is not too complex. The additional wavefield attributes can be used to enhance the velocity model in a robust noise-insensitive procedure, and to design migration operators. The field data examples of the CRS-PreSTM and CRS-PreSDM work flow reveal the high potential of noise reduction for seismic time and depth domain imaging. The key for the improved quality is the combined usage of the CRS attributes for the time domain S/N enhanced processing and regularization, the enhanced velocity building especially for noise contaminated data, and the migration parametrization in combination.