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CWP-645 Simultaneous source imaging by amplitude encoding

The computational cost of conventional shot-record imaging is large for today’s wideazimuth seismic surveys. One strategy to reduce the overall cost of seismic imaging is to migrate with multiple shot-gathers at once, a technique which is known as blended source imaging. Blended source imaging trades the reduced cost of imaging with the presence of artifacts (cross-talk) in the image. A special case of blended source imaging is that of zero phase-delay, or simultaneous sources. We show that a theoretical framework using a matrix representation of the imaging process adequately describes both conventional and simultaneous source imaging. Furthermore, the matrix representation predicts both the quantity and strength of cross-talk artifacts prior to imaging, thus allowing us to decide a priori the trade off between cross-talk and speed. By exploiting our theoretical framework, we are able to design a simultaneous source encoding scheme, referred to as Truncated Singular Vector encoding (TSV), that trades a significantly reduced cost of imaging with spatial resolution. The TSV encoding allows us to reduce the cost of imaging by at least an order of magnitude relative to conventional shot-record migration. Overall, we provide a framework for finding simultaneous source encoding schemes, that produce good quality images at lower computational cost.