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A Second-order Adjoint Truncated Newton Approach to Time-domain Multiparameter Full Waveform Inversion in Viscoacoustic MediumNormal access

Authors: P. Yang, R. Brossier, L. Métivier, J. Virieux and W. Zhou
Event name: 79th EAGE Conference and Exhibition 2017
Session: FWI I
Publication date: 12 June 2017
DOI: 10.3997/2214-4609.201700835
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.15Mb )
Price: € 20

Summary:
The truncated Newton (TRN) method has been demonstrated as an important optimization method for multi-parameter full waveform inversion (FWI). In this study, we propose an implementation of this strategy for time-domain 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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