Full waveform inversion based on hybrid gradient  

作　　者：Chuang Xie Zhi-Liang Qin Jian-Hua Wang Peng Song Heng-Guang Shen Sheng-Qi Yu Ben-Jun Ma Xue-Qin Liu 

机构地区：[1]Qingdao Innovation and Development Base,Harbin Engineering University,Qingdao,266000,Shandong,China [2]Qingdao Innovation and Development Center,Harbin Engineering University,Qingdao,266000,Shandong,China [3]CNOOC Research Institute Co.,Ltd.,Beijing,100028,China [4]College of Marine Geoscience,Ocean University of China,Qingdao,266100,Shandong,China [5]Weihai Sunfull Geophysical Exploration Equipment Co.,Ltd.,Weihai,264209,Shandong,China

出　　处：《Petroleum Science》2024年第3期1660-1670,共11页石油科学（英文版）

基　　金：jointly supported by Young Scientists Cultivation Fund Project of Harbin Engineering University(79000013/003);the Mount Taishan Industrial Leading Talent Project;the Great and Special Project under Grant KJGG-2022-0104 of CNOOC Limited;the National Natural Science Foundation of China(42006064,42106070,42074138)。

摘　　要：The low-wavenumber components in the gradient of full waveform inversion(FWI)play a vital role in the stability of the inversion.However,when FWI is implemented in some high frequencies and current models are not far away from the real velocity model,an excessive number of low-wavenumber components in the gradient will also reduce the convergence rate and inversion accuracy.To solve this problem,this paper firstly derives a formula of scattering angle weighted gradient in FWI,then proposes a hybrid gradient.The hybrid gradient combines the conventional gradient of FWI with the scattering angle weighted gradient in each inversion frequency band based on an empirical formula derived herein.Using weighted hybrid mode,we can retain some low-wavenumber components in the initial lowfrequency inversion to ensure the stability of the inversion,and use more high-wavenumber components in the high-frequency inversion to improve the convergence rate.The results of synthetic data experiment demonstrate that compared to the conventional FWI,the FWI based on the proposed hybrid gradient can effectively reduce the low-wavenumber components in the gradient under the premise of ensuring inversion stability.It also greatly enhances the convergence rate and inversion accuracy,especially in the deep part of the model.And the field marine seismic data experiment also illustrates that the FWI based on hybrid gradient(HGFWI)has good stability and adaptability.

关 键 词：Full waveform inversion Hybrid gradient Scattering angle weighted Low-wavenumber component 

分 类 号：TE311[石油与天然气工程—油气田开发工程]