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Reconstruction of Sharp Interfaces in Time-Domain Full Waveform Inversion
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE 2020 Annual Conference & Exhibition Online, Dec 2020, Volume 2020, p.1 - 5
Abstract
Summary
We propose a shape optimization algorithm to reconstruct sharp interfaces in time-domain FWI. The interface of a salt domain is considered as the variable of a tracking-type cost functional. A damping term in the neighborhood of the boundary is used to model an unbounded domain. Using a Lagrangian approach, we compute the shape derivative of the cost functional. The shape derivative depends on an adjoint state, which is the solution of a wave equation with the residual on the right-hand side. The interface evolution is performed using a level set method. Using synthetic measurements, we show the efficiency of the method through several examples of reconstruction.
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