Improving salt boundary imaging using an RTM inverse scattering imaging condition

Sang Suh, Bin Wang
2013 SEG Technical Program Expanded Abstracts 2013   unpublished
Reverse time migration (RTM) suffers from low wavenumber noise especially above strong reflectors such as salt boundaries. The traditional method of removing the noise is applying low cut filtering, which could destroy real events. The inverse scattering imaging condition selectively removes the backscattering noise. We introduce a method of computing the inverse scattering weighting coefficient. Synthetic and field examples show that the inverse scattering imaging improves salt boundary
more » ... alt boundary imaging compared to post-processed conventional RTM. The complicated imaging algorithm requires more computing time. The main overhead comes from the increased amount of source wavefield data. By redistributing some of the data compression process to the GPU's, we were able to reduce the run time overhead by 10% of the conventional RTM. The high-cut filtered wavefields,Ĩ ∇ andĨ dt can be created by applying a simple band-pass filter with cut-off beginning at
doi:10.1190/segam2013-0686.1 fatcat:4kkvrulkpzdv3ekfu2luklh6vy