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Preconditioned 3D Least-Squares RTM with Non-Stationary Matching Filters
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Summary
For 3D least-squares RTM, I approximate the inverse Hessian operator with non-stationary 3D matching filters. These non-stationary filters can be seen as a low-rank approximation of the true inverse Hessian. I use these matching filters to precondition the inversion of prestack seismic data and observe a significant convergence speed-up compare to a non-preconditioned inversion.
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