Full waveform inversion based on a local traveltime correction and zero-mean cross-correlation-based misfit function

Acta Geophysica

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