Waveform inversion in acoustic orthorhombic media with a practical set of parameters
Type
Conference PaperAuthors
Masmoudi, Nabil
Alkhalifah, Tariq Ali

KAUST Department
Earth Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Seismic Wave Analysis Group
Date
2017-08-17Online Publication Date
2017-08-17Print Publication Date
2017-08-17Permanent link to this record
http://hdl.handle.net/10754/626250
Metadata
Show full item recordAbstract
Full-waveform inversion (FWI) in anisotropic media is overall challenging, mainly because of the large computational cost, especially in 3D, and the potential trade-offs between the model parameters needed to describe such a media. We propose an efficient 3D FWI implementation for orthorhombic anisotropy under the acoustic assumption. Our modeling is based on solving the pseudo-differential orthorhombic wave equation split into a differential operator and a scalar one. The modeling is computationally efficient and free of shear wave artifacts. Using the adjoint state method, we derive the gradients with respect to a practical set of parameters describing the acoustic orthorhombic model, made of one velocity and five dimensionless parameters. This parameterization allows us to use a multi-stage model inversion strategy based on the continuity of the scattering potential of the parameters as we go from higher symmetry anisotropy to lower ones. We apply the proposed approach on a modified SEG-EAGE overthrust synthetic model. The quality of the inverted model suggest that we may recover only 4 parameters, with different resolution scales depending on the scattering potential of these parameters.Citation
Masmoudi N, Alkhalifah T (2017) Waveform inversion in acoustic orthorhombic media with a practical set of parameters. SEG Technical Program Expanded Abstracts 2017. Available: http://dx.doi.org/10.1190/segam2017-17672715.1.Sponsors
We would like to thank KAUST for financial support and SWAG members for many useful discussions. For computer time, this research used the resources of the Supercomputing Laboratory in KAUST.Publisher
Society of Exploration GeophysicistsAdditional Links
https://library.seg.org/doi/10.1190/segam2017-17672715.1ae974a485f413a2113503eed53cd6c53
10.1190/segam2017-17672715.1