1887

Abstract

Summary

Based on the energy conservation principle, we derive a scalar imaging condition for anisotropic elastic wavefield migration. Compared to conventional imaging conditions that simply correlate displacement components or potentials from source and receiver wavefields, the proposed imaging condition does not suffer from polarity reversal, which might degrade the image quality after stacking over shots. Our imaging condition also accounts for the directionality of the wavefields in space and time, leading to attenuation of backscattering artifacts, which commonly appear in elastic reverse-time migration images with strong model contrasts. In addition, our new imaging condition does not require wave-mode decomposition, which demands significant additional cost for anisotropic wavefields. This new imaging condition relies on knowledge of the anisotropic model parameters used during migration, and is applicable for any kind of anisotropy. We show the quality of the energy image compared to its conventional counterparts by numerical experiments that simulate complex geological settings.

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/content/papers/10.3997/2214-4609.201601533
2016-05-31
2020-04-08
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