Acoustic multi-parameter FWI for the reconstruction of P-wave velocity, density and attenuation: preconditioned truncated Newton approach

Description

Multi-parameter full waveform inversion is a challenging problem, mainly because of the existence of trade-offs between subsurface parameters. Mitigating these trade-offs requires to account accurately for the inverse Hessian operator during the minimization process. In this study, we investigate the efficiency of the truncated Newton minimization approach in the 2D acoustic frequency-domain approximation for the simultaneous reconstruction of P-wave velocity, density and attenuation factor. To further enhance the performances of the truncated Newton algorithm, a preconditioner adapted to this multi-parameter problem is designed, based on a 3 × 3 block approximation of the Hessian operator where each block is diagonal. Numerical results on the synthetic Valhall model illustrate the interest of this strategy.

Abstract

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