1887

Abstract

Summary

The truncated Newton (TRN) method has been demonstrated as an important optimization method for multiparameter full waveform inversion (FWI). In this study, we propose an implementation of this strategy for timedomain FWI based on the 1st-order VTI viscoacoustic wave system. Compared with previous frequency-domain FWI studies with 2nd-order wave equation using TRN, the time-domain counterpart allowing for anisotropy and attenation is appealing due to widely available well-developed preprocessing tools, straightforward data windowing and the simultaneous inversion within broad frequency bands. To overcome the computational challenge for efficiently building the gradient and Hessian-vector product in the presence of seismic attenuation, we use wavefield reconstruction technique with checkpointing-assisted reverse-forward simulation (CARFS) algorithm. The TRN method equipped with the pseudo Hessian preconditioner and unity-based normalization, allows fast convergence when updating multiple parameters. The 2D Valhall synthetic study demonstrates that preconditioned TRN (PTRN) significantly improves the multiparameter reconstruction under (Vp,rho, 1/Q) parameterization, while mitigating the crosstalk issue from parameters of different classes. Moving to field data application using PTRN is an attractive direction in the future.

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/content/papers/10.3997/2214-4609.201700835
2017-06-12
2020-07-06
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References

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