低频缺失数据的弹性波全波形反演策略  

Full Waveform Inversion Strategy of Elastic Wave with Low Frequency Missing Data

作　　者：郭啟民 何兵寿[1,2] 史才旺 GUO Qi-Min;HE Bing-Shou;SHI Cai-Wang(The Key Laboratory of Submarine Science and Exploration Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;Functional Laboratory of Marine Mineral Resources Evaluation and Exploration Technology, Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266237, China;College of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518000, China)

机构地区：[1]中国海洋大学海底科学与探测技术教育部重点实验室,山东青岛266100 [2]青岛海洋科学与技术试点国家实验室,海洋矿产资源评价与探测技术功能实验室,山东青岛266237 [3]南方科技大学地球与空间科学学院,广东深圳518000

出　　处：《中国海洋大学学报（自然科学版）》2020年第7期108-116,共9页Periodical of Ocean University of China

基　　金：国家重点研究发展计划项目(2018YFC1405900);中央高校基本科研业务费专项项目(201822011);国家自然科学基金项目(41674118);国家重大科技专项项目(2016ZX05027-002)资助。

摘　　要：弹性波全波形反演对地震数据的低频成分具有很强的依赖性。当多分量地震数据缺失低频成分时,混合域频率多尺度全波反演方法容易陷入局部极值,得到错误的反演结果。为降低弹性波波形反演的对初始模型的依赖,提出了Laplace-Fourier域反演与混合域反演相结合的反演策略,其基本思路为:先应用Laplace-Fourier域反演对低频缺失的地震数据指数衰减并反演,重建出模型的中、长波成分,然后将该模型作为后续混合域反演的初始模型,利用多尺度反演逐步恢复模型的短波长成分。模型数据的反演结果显示,在数据缺失低频时利用Laplace-Fourier域反演可获得一个更加准确的长波长纵、横波速度模型,将此模型作为混合域频率多尺度反演的初始模型能够更好地重建地下介质的弹性参数,从而得到更准确的结果。The full waveform inversion of elastic wave has a strong dependence on the low frequency components of seismic data.The mixed domain frequency multi-scale full wave inversion method easily fall into the local extremum and result in the wrong inversion results,when the low frequency component is absent from the multi-component seismic data.The inversion strategy of combining Laplace Fourier domain inversion with mixed domain inversion is proposed in order to reduce the dependence of elastic wave shape inversion on the initial model.We use the inversion of Laplace Fourier domin to attenuate and inverse the index of low-frequency missing seismic data.We reconstruct the medium and long wave components of the model.Taking the model as the initial model of the subsquent mixed domin inversion,we gradually restore the short wavelength components of the model by using multi-scale inversion.The inversion results of the model data show that a more accurate long wave longitudinal and shear wave velocity model can be obtained by using the Laplace Fourier domain inversion when the data is missing in low frequency.Taking this model as the initial model of multi-scale frequency inversion in the mixed domain,the elastic parameters of the underground medium can be reconstructed better and the more accurate results can be obtained.

关 键 词：弹性波 全波形反演 混合域 Laplace-Fourier域反演 低频模型 

分 类 号：P631.4[天文地球—地质矿产勘探]