Print Email Facebook Twitter An Accurate Propagator for Heterogeneous Media in Full Wavefield Migration Title An Accurate Propagator for Heterogeneous Media in Full Wavefield Migration Author Li, A.L. (TU Delft ImPhys/Verschuur group; China University of Geosciences) Verschuur, D.J. (TU Delft Applied Geophysics and Petrophysics) Liu, Xuewei (China University of Geosciences) Abolhassani, S. (TU Delft Applied Geophysics and Petrophysics; TU Delft ImPhys/Verschuur group) Date 2024 Abstract Since seismic imaging creates an image of the subsurface structure based on information received from the measured wavefield, it is essential to fully utilize the reflected waves. Full Wavefield Modeling (FWMod) was developed with recursive and iterative up-and-down wavefield propagation, using one-way wave propagation, to model both primary and multiple reflections. Using FWMod as the modeling engine, Full Wavefield Migration (FWM) has been introduced to directly image data including internal multiples, where internal multiple crosstalk is suppressed automatically via an inversion-based data-fitting process. This avoids the need for applying internal multiple removal, which is often challenging. Conventional one-way wave propagators calculated in the wavenumber domain, like the phase shift (PS) operator, have limitations when applied to strongly inhomogeneous media. Even when computing a new operator at each lateral grid point, they still suffer difficulties because the medium is assumed to be locally homogeneous. In the past, matrix eigendecomposition has been proposed as a way to create accurate, local velocity-based one-way propagation operators. In this article, an accurate propagator based on eigendecomposition is incorporated into FWMod and FWM. In the numerical examples, four models with strong lateral velocity variations were used to test the propagator. With a comparison of the conventional FWM based on the PS operator with input data including FWMod and a finite-difference (FD) approach, the numerical examples demonstrated that the proposed method has the potential to significantly enhance image reflectivity, suppress internal multiples, and maintain convergence speed during the least-squares inversion. Subject Eigen-decomposition (ED)full wavefield migration (FWM)propagatorwave equation To reference this document use: http://resolver.tudelft.nl/uuid:46c8bb0e-b081-404f-b989-1e6c694b9b92 DOI https://doi.org/10.1109/TGRS.2024.3397887 Embargo date 2024-11-06 ISSN 0196-2892 Source IEEE Transactions on Geoscience and Remote Sensing, 62 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2024 A.L. Li, D.J. Verschuur, Xuewei Liu, S. Abolhassani Files file embargo until 2024-11-06