1887

Abstract

Summary

Least-squares reverse time migration (LSRTM) based on anisotropic propagator is a powerful tool for imaging the complicated geologic structure in the subsurface. But conventional demigration operator was applied in anisotropic LSRTM was built by using pseudo-acoustic wave equation, which may suffer from physical instability and undesirable noise. To overcome these defects, firstly, low-rank finite-difference method was employed to establish the linearized modeling operator for relieving wavefield instability and suppressing unwanted noise caused by qSV-wave artifacts, and then the forward modeling operator and its adjoint were used to implement LSRTM, in addition, plane-wave encoding strategy was introduced to the inversion framework of anisotropic media for decreasing the I/O and storage demands and improving the inversion efficiency. Numerical tests on synthetic dataset with a complex Marmousi model demonstrate wave-extrapolation operator based on low-rank finite-difference can produce stable wavefield, and good images can be generated by the proposed method.

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/content/papers/10.3997/2214-4609.201701410
2017-06-12
2020-08-04
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