Full-waveform inversion with an exponential filter in wavenumber domain
Type
Conference PaperKAUST Department
Earth Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Seismic Wave Analysis Group
Date
2020-09-30Online Publication Date
2020-09-30Print Publication Date
2020-09-30Permanent link to this record
http://hdl.handle.net/10754/665476
Metadata
Show full item recordAbstract
The gradient of full-waveform inversion (FWI) can be decomposed into a tomographic part, which is smooth (lowwavenumbers) and an image part, which is more sharp (highwavenumbers). Most of the FWI procedures need to update the smooth part first and gradually include the details to mitigate the cycle-skipping problem. The scattering angle filter for the gradient is one way to isolate the low-wavenumber part of the gradient at the early stage. However, it could be costly because of the extensions necessary for precise scattering angle control. Due to the relationship between the wavenumber and the scattering angle, the large scattering angles correspond to the low wavenumber component, which is usually what we want to update in our initial inversion steps. Thus, we use an exponential filter in the wavenumber domain and update the model in the wavenumber domain from low to high. The numerical result indicates that the inversion benefits from the wavenumber domain filter.Citation
Chang, K., Song, C., Alkhalifah, T., & Zhang, H. (2020). Full-waveform inversion with an exponential filter in wavenumber domain. SEG Technical Program Expanded Abstracts 2020. doi:10.1190/segam2020-3427081.1Sponsors
We would like to thank KAUST for supporting the study and Seismic Wave Analysis Group (SWAG) for fruitful discussions.The author Kai Chang also thanks to the China Scholar Coun-cil (CSC) for supporting his study in KAUST.Publisher
Society of Exploration GeophysicistsAdditional Links
https://library.seg.org/doi/10.1190/segam2020-3427081.1ae974a485f413a2113503eed53cd6c53
10.1190/segam2020-3427081.1