Wave-equation Migration Velocity Analysis Using Plane-wave Common Image Gathers

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11 Scopus citations

Abstract

Wave-equation migration velocity analysis (WEMVA) based on subsurface-offset, angle domain or time-lag common image gathers (CIGs) requires significant computational and memory resources because it computes higher dimensional migration images in the extended image domain. To mitigate this problem, a WEMVA method using plane-wave CIGs is presented. Plane-wave CIGs reduce the computational cost and memory storage because they are directly calculated from prestack plane-wave migration, and the number of plane waves is often much smaller than the number of shots. In the case of an inaccurate migration velocity, the moveout of plane-wave CIGs is automatically picked by a semblance analysis method, which is then linked to the migration velocity update by a connective function. Numerical tests on two synthetic datasets and a field dataset validate the efficiency and effectiveness of this method.
Original languageEnglish (US)
Pages (from-to)S327-S340
Number of pages1
JournalGEOPHYSICS
Volume82
Issue number5
DOIs
StatePublished - Jul 18 2017

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