慢度平方三角网格模型VTI介质二维QP波各向异性立体层析反演  

2D QP anisotropic stereo-tomography for VTI media in triangulated model

作　　者：周嘉欣 杨锴[3] 邵炜栋 ZHOU JiaXin;YANG Kai;SHAO WeiDong(CCTEG Changzhou Research Institute,Changzhou Jiangsu 213015,China;Tiandi(Changzhou)Automation Co.,Ltd.,Changzhou Jiangsu 213015,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China;Alibaba Group,Hangzhou 311121,China)

机构地区：[1]中煤科工集团常州研究院有限公司,江苏常州213015 [2]天地(常州)自动化股份有限公司,江苏常州213015 [3]同济大学海洋地质国家重点实验室,上海200092 [4]阿里巴巴集团,杭州311121

出　　处：《地球物理学报》2021年第11期4134-4149,共16页Chinese Journal of Geophysics

基　　金：国家自然科学基金面上项目(41874118)资助.

摘　　要：基于慢度平方三角网格剖分模型下的各向异性射线扰动理论,建立了具有垂直对称轴的横向各向同性(VTI)介质中二维QP波立体层析所需的FRECHET导数矩阵,实现了慢度平方三角网格模型的VTI介质二维QP波各向异性立体层析.考虑到各向异性参数是影响地震波运动学特征的次一级因素,制定了先反演慢度再反演各向异性参数的反演策略.由于慢度平方三角网格模型的稀疏性,使得数据空间对模型空间的FRECHET导数矩阵规模被大幅压缩,在降低了计算成本的同时也很好的保证了界面位置、背景慢度、各向异性等各个参数的反演精度.理论数据算例证实了FRECHET导数的正确性和反演策略的合理性.Based on the anisotropic ray perturbation theory in slowness squared triangulated model,a 2D QP wave anisotropic stereo-tomography for VTI media is presented.Due to the sparsity of slowness-squared triangulated model,the scale of FRECHET derivative matrix of stereo-tomography is greatly reduced thus the computational cost is significantly cut down.Meanwhile,the accuracy of a joint inversion of the interface position,background velocity and anisotropic parameters is pretty good.The numerical examples demonstrated the correctness of the presented Frechet derivatives and the feasibility of the inversion strategy.

关 键 词：慢度平方三角网格模型 二维各向异性QP波立体层析 各向异性射线扰动理论 

分 类 号：P631[天文地球—地质矿产勘探]