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dc.contributor.authorZhu, Zhaolin
dc.contributor.authorCao, Danping
dc.contributor.authorWu, Bangyu
dc.contributor.authorYin, Xingyao
dc.contributor.authorWang, Ying
dc.date.accessioned2022-05-02T14:38:58Z
dc.date.available2022-05-02T14:38:58Z
dc.date.created2020-03-09T12:15:49Z
dc.date.issued2019
dc.identifier.citationJournal of Geophysics and Engineering. 2019, 16 (6), 1071-1083.en_US
dc.identifier.issn1742-2132
dc.identifier.urihttps://hdl.handle.net/11250/2993707
dc.description.abstractGrid size has a significant influence on the computation efficiency and accuracy of finite-difference seismic modeling and can change the workload of reverse time migration (RTM) remarkably. This paper proposes a non-orthogonal analytical coordinate system, beam coordinate system (BCS), for the solution of seismic wave propagation and RTM. Starting with an optical Gaussian beam width equation, we expand the representation on vertically variable velocity media, which is the most common scenario in seismic exploration. The BCS based on this representation can be used to implement an irregular-grid increment finite-difference that improves the efficiency of RTM. Based on the Laplacian expression in Riemannian space, we derive the wave equation in the BCS. The new coordinate system can generate an irregular grid with increment increasing vertically along depth. Through paraxial ray tracing, it can be extended to non-analytical beam coordinate system (NBCS). Experiments for the RTM on the Marmousi model with the BCS demonstrate that the proposed method improves the efficiency about 52% while maintaining good image quality.en_US
dc.language.isoengen_US
dc.publisherOxford University Pressen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleNon-orthogonal beam coordinate system wave propagation and reverse time migrationen_US
dc.title.alternativeNon-orthogonal beam coordinate system wave propagation and reverse time migrationen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber1071-1083en_US
dc.source.volume16en_US
dc.source.journalJournal of Geophysics and Engineeringen_US
dc.source.issue6en_US
dc.identifier.doi10.1093/jge/gxz067
dc.identifier.cristin1800575
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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