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An affine generalized optimal scheme with improved free-surface expression using adaptive strategy for frequency-domain elastic wave equation

文献类型：期刊论文

作者Dong, Shu-Li1,2,3; Chen, Jing-Bo1,2,3
刊名GEOPHYSICS
出版日期2022-05-01
卷号87期号:3页码:T183-T204
ISSN号0016-8033
DOI10.1190/GEO2021-0345.1
英文摘要Effective frequency-domain numerical schemes are central for forward modeling and inversion of the elastic wave equation. The rotated optimal nine-point scheme is a highly utilized finite-difference (FD) numerical scheme. This scheme makes a weighted average of the derivative terms of the elastic wave equations in both the original and the rotated coordinate systems. In comparison with the classical nine-point scheme, it can simulate S-waves better and has higher accuracy at nearly the same computational cost. Nevertheless, this scheme limits the rotation angle to 45 degrees; thus, the grid sampling intervals in the x- and z-directions need to be equal. Otherwise, the grid points will not lie on the axes, which dramatically complicates the scheme. Affine coordinate systems do not constrain axes to be perpendicular to each other, providing enhanced flexibility. Based on the affine coordinate transformations, we developed a new affine generalized optimal ninepoint scheme. At the free surface, we applied the improved free-surface expression with an adaptive parameter-modified strategy. The new optimal scheme had no restriction that the rotation angle must be 45 degrees. Dispersion analysis shows that our scheme can effectively reduce the required number of grid points per shear wavelength for both equal and unequal sampling intervals compared to the classical nine-point scheme. Moreover, this reduction improves with the increase of Poisson's ratio. Three numerical examples demonstrate that our scheme can provide more accurate results than the classical nine-point scheme in terms of both the internal and free-surface grid points.
WOS关键词DERIVATIVE OPTIMAL SCHEME ; FINITE-DIFFERENCE ; FORM INVERSION ; PROPAGATION ; BOUNDARY ; SCALAR
资助项目National Natural Science Foundation of China[42074159] ; National Natural Science Foundation of China[41874163]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者SOC EXPLORATION GEOPHYSICISTS
WOS记录号WOS:000793484400002
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/105907]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Chen, Jing-Bo
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Dong, Shu-Li,Chen, Jing-Bo. An affine generalized optimal scheme with improved free-surface expression using adaptive strategy for frequency-domain elastic wave equation[J]. GEOPHYSICS,2022,87(3):T183-T204.
APA Dong, Shu-Li,&Chen, Jing-Bo.(2022).An affine generalized optimal scheme with improved free-surface expression using adaptive strategy for frequency-domain elastic wave equation.GEOPHYSICS,87(3),T183-T204.
MLA Dong, Shu-Li,et al."An affine generalized optimal scheme with improved free-surface expression using adaptive strategy for frequency-domain elastic wave equation".GEOPHYSICS 87.3(2022):T183-T204.

入库方式： OAI收割

来源：地质与地球物理研究所

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