标题:Full unwrapped phase inversion in the phase space
作者:Lin, Yuzhao ;Zhang, Kai ;Li, Zhenchun ;Din, Renwei ;Yu, Zhennan
作者机构:[Lin, Yuzhao ;Zhang, Kai ;Li, Zhenchun ] China University of Petroleum (East China), China;[Yu, Zhennan ] China University of Petroleum, Beijing, Chin 更多
会议名称:Society of Exploration Geophysicists International Exposition and Annual Meeting 2019, SEG 2019
会议日期:15 September 2019 through 20 September 2019
来源:SEG International Exposition and Annual Meeting 2019
出版年:2020
页码:1565-1569
DOI:10.1190/segam2019-3215652.1
摘要:Full waveform inversion (FWI), as a high-precision seismic inversion method based on data-fitting, suffers from cycle-skipping problem in the case of inaccurate initial model or missing low frequencies. Especially when it comes to large-scale strong velocity perturbations, FWI will be more challenging because of the much stronger non-linear problem, while the conventional FWI method failed to converge to reliable inversion results. The normal solution in FWI to mitigating the reliance on the initial velocity or overcoming the cycle-skipping problem is replacing the restricted or sampled wavefield with a new variable. However, the chain differentiation involved in the above method preserves the non-linearity. Therefore, we proposed to use the phase form of the frequency-domain wave equation as the constraint, replace the wavefield with the unwrapped phase in the objective function and process inversion in the phase space instead of wavefield space, which can make the most of the linearity between model parameters and unwrapped phase, weakening the nonlinearity in the forward operator and solve the strong nonlinear problem. The relative equations of full unwrapped phase inversion are given. We applied the unwrapped algorithm: magnitude-sorted list, multi-clustering algorithm to retrieving the unwrapped phase. The resolution of the inversion is reduced due to the new constraint mapping the model parameter space to the phase space, but we have recovered reliable result of the large-scale low wavenumber components. Numerical tests on Marmousi result shows the accuracy of full unwrapped phase inversion, and the test on part of BP model with noise interference demonstrate the applicability of the proposed method to solve the strong nonlinear problem. © 2019 SEG
收录类别:EI;SCOPUS
资源类型:会议论文;期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85079484379&doi=10.1190%2fsegam2019-3215652.1&partnerID=40&md5=792e841a38f8696756c8dd458ac9b5af
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