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• W2010668118 abstract "Reverse-time migration is a well-known method based on a single-scattering approximation; it is designed to obtain seismic images in the case of a complex subsurface. It can, however, be a very time-consuming task because the number of computations is directly proportional to the number of processed sources. In the context of velocity model-building, iterative approaches require that one derives a series of migrated sections for different velocity models. We propose to replace the summation over sources by a summation over depth offsets or time delays defined in the subsurface. For that, we have developed a new relationship between two migrated sections obtained for two different velocity models. Starting from one of the two images, we obtain a second section correctly and efficiently. For each time delay, we compute a generalized source term by extending the concept of exploding reflector to nonzero offset. We obtain the final migrated section by solving the same wave equation in the perturbed model with the modified source term. Our work included testing the methodology on 2D synthetic data sets, particularly when the initial and perturbed velocity models differ greatly." @default.
• W2010668118 created "2016-06-24" @default.
• W2010668118 creator A5004580808 @default.
• W2010668118 creator A5073893343 @default.
• W2010668118 date "2010-05-01" @default.
• W2010668118 modified "2023-09-27" @default.
• W2010668118 title "Seismic wave-equation demigration/migration" @default.
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• W2010668118 doi "https://doi.org/10.1190/1.3380705" @default.
• W2010668118 hasPublicationYear "2010" @default.
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