Acta Geophysica | |
Full waveform inversion based on a local traveltime correction and zero-mean cross-correlation-based misfit function | |
article | |
Dong, Shiqi1  Han, Liguo1  Hu, Yong1  Yin, Yuchen1  | |
[1] College of Geo-Exploration Science and Technology, Jilin University | |
关键词: FWI; Local traveltime correction; Zero-mean normalized cross-correlation; | |
DOI : 10.1007/s11600-019-00388-x | |
学科分类:地球科学(综合) | |
来源: Polska Akademia Nauk * Instytut Geofizyki | |
【 摘 要 】
Full waveform inversion (FWI) suffers from the cycle skipping problem, because the observed data usually lack low-frequency components or due to errors in the wavelet estimation. In addition, the strong low-frequency non-zero-mean noise can have a large impact on FWI results. Thus, we propose a local waveform traveltime correction scheme to solve the situations when the observed data lack low-frequency components or when the estimation for the wavelet is incorrect. We use a sliding time window, which is used to decrease the traveltime differences between the calculated and observed data to increase the cross-correlation between them. Besides, we propose a zero-mean normalized cross-correlation misfit function to reduce the interference of the low-frequency non-zero-mean noise. Therefore, we propose new approaches to improve FWI results whether the observed data lack low-frequency components or the observed data are contaminated by the non-zero-mean low-frequency noise. Numerical examples on Marmousi model show the feasibility of a FWI based on the zero-mean normalized cross-correlation misfit function and a FWI based on the local traveltime correction method.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO202108090001661ZK.pdf | 4659KB | download |