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Mitigating the gradient artefacts of Migration Velocity Analysis by Gauss-Newton update
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017 - Workshops, Jun 2017, cp-519-00068
- ISBN: 978-94-6282-219-1
Abstract
This paper shows how the artefacts present in the gradient of the cost function when performing a Migration Velocity Analysis can be strongly attenuated by using a second-order Gauss-Newton scheme. The artefacts on the velocity gradient are strongly attenuated when the total gradient is deconvolved by the approximate total Hessian. At each iteration, a least-squares migration is produced rather than a migration. The proposed algorithm is illustrated on the Marmousi dataset.