Common-image gathers in the offset domain from reverse-time migration
KAUST DepartmentEarth Science and Engineering Program
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AbstractKirchhoff migration is flexible to output common-image gathers (CIGs) in the offset domain by imaging data with different offsets separately. These CIGs supply important information for velocity model updates and amplitude-variation-with-offset (AVO) analysis. Reverse-time migration (RTM) offers more insights into complex geology than Kirchhoff migration by accurately describing wave propagation using the two-way wave equation. But, it has difficulty to produce offset domain CIGs like Kirchhoff migration. In this paper, we develop a method for obtaining offset domain CIGs from RTM. The method first computes the RTM operator of an offset gather, followed by a dot product of the operator and the offset data to form a common-offset RTM image. The offset domain CIGs are then achieved after separately migrating data with different offsets. We generate offset domain CIGs on both the Marmousi synthetic data and 2D Gulf of Mexico real data using this approach. © 2014.
SponsorsThe authors wish to thank the Center for Subsurface Imaging and Fluid Modeling (CSIM) sponsors for their financial support. We also appreciate the anonymous reviewers who made a number of helpful suggestions that improved the quality of our manuscript.
JournalJournal of Applied Geophysics