Abstract
We propose a critical reflection illumination analysis to evaluate subsalt illumination in areas where high velocity contrasts create shadow zones. This phenomenon often occurs at the base and edges of salt bodies, for example. When critical reflection occurs, continued iterations of processing and imaging, or increasing the offset/azimuth of the surface acquisition will result in limited if any improvement in the imaging of subsalt targets. The proposed illumination analysis can help avoid these expensive processing/imaging and acquisition efforts for areas that are in the critical/post-critical reflection regime. This analysis is a general method that can also be used in other high velocity contrast scenarios.
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