IGGCAS OpenIR  > 油气资源研究院重点实验室
A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling
Cao, Jian1,2,3; Chen, Jing-Bo2,3
2018-11-01
Source PublicationGEOPHYSICS
ISSN0016-8033
Volume83Issue:6Pages:T313-T332
AbstractAccurate seismic modeling with a realistic topography plays an essential role in onshore seismic migration and inversion. The finite-difference (FD) method is one of the most popular numerical tools for seismic modeling. But implementing the free surface on topography using the FD method is nontrivial. We have developed a stable and efficient parameter-modified (PM) method for modeling elastic-wave propagation in the presence of complex topography. This method is based on a standard staggered-grid scheme, and the stress-free condition is implemented on the rugged surface by modifying the redefined medium parameters at the discrete topography boundary points. This numerical treatment for topography needs to be performed only once before the wave simulation. In this way, we avoid the tedious handling of wavefield variables in every time step, and this boundary treatment can be integrated easily into existing staggered-grid FD modeling codes. A series of numerical tests in two dimensions and three dimensions indicate that with a spatial sampling of 15 grid points per minimum wavelength, our method is good enough to eliminate staircase diffractions and produces more accurate results than those obtained by some other staggered-grid-based numerical approaches. Numerical experiments on some more complex models also demonstrate the feasibility of our method in handling topography with strong variation and Poisson's ratio discontinuity. In addition, this PM method can be used in a discontinuous-grid scheme in which only the regions near the irregular topography need to be oversampled, which is very important for improving its efficiency in real applications.
DOI10.1190/GEO2018-0098.1
Funding OrganizationNational 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
WOS KeywordSPECTRAL ELEMENT METHOD ; BOUNDARY-CONDITIONS ; HETEROGENEOUS MEDIA ; RAYLEIGH-WAVES ; SEISMIC MOTION ; PROPAGATION ; SIMULATION ; SCHEMES
Language英语
Funding ProjectNational Natural Science Foundation of China[41674132] ; National Natural Science Foundation of China[41474104]
Funding OrganizationNational 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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000457502000059
PublisherSOC EXPLORATION GEOPHYSICISTS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90546
Collection油气资源研究院重点实验室
Corresponding AuthorCao, Jian
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Cao, Jian,Chen, Jing-Bo. A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling[J]. GEOPHYSICS,2018,83(6):T313-T332.
APA Cao, Jian,&Chen, Jing-Bo.(2018).A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling.GEOPHYSICS,83(6),T313-T332.
MLA Cao, Jian,et al."A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling".GEOPHYSICS 83.6(2018):T313-T332.
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