A novel and efficient engine for P-/S-wave-mode vector decomposition for vertical transverse isotropic elastic reverse time migration

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dc.citation.firstpageA49en_US
dc.citation.issueNumber4en_US
dc.citation.journalTitleGeophysicsen_US
dc.citation.lastpageWB54en_US
dc.citation.volumeNumber87en_US
dc.contributor.authorZhang, Leleen_US
dc.contributor.authorLiu, Luen_US
dc.contributor.authorNiu, Fenglinen_US
dc.contributor.authorZuo, Jiahuien_US
dc.contributor.authorShuai, Daen_US
dc.contributor.authorJia, Wanlien_US
dc.contributor.authorZhao, Yangen_US
dc.date.accessioned2022-06-22T16:16:34Zen_US
dc.date.available2022-06-22T16:16:34Zen_US
dc.date.issued2022en_US
dc.description.abstractWave-mode decomposition plays a very important role in elastic reverse time migration (ERTM). Improved imaging quality can be achieved due to reduced wave-mode crosstalk artifacts. The current state-of-the-art methods for anisotropic wavefield separation are based on either splitting model strategy, low-rank approximation, or lower-upper (LU) factorization. Most of these involve expensive matrix computation and Fourier transforms with strong model assumptions. Based on the anisotropic-Helmholtz (ani-Helmholtz) decomposition operator and decoupled formulations, we develop a novel and efficient P-/S-wave-mode vector decomposition method in vertical transverse isotropic (VTI) media with application in ERTM. We first review the basics of classical Helmholtz decomposition and isotropic decoupled formulations. In addition, the ani-Helmholtz decomposition operator is built from the P- and S-wave polarizations of the Christoffel equation in VTI media. We then derive novel decoupled formulations of anisotropic P-/S-waves based on the obtained ani-Helmholtz operator. Moreover, we use the first-order Taylor expansion to approximate the normalization term from the derived decoupled formulations and obtain an efficient ani-Helmholtz decomposition approach, which produces vector P- and S-wavefields with correct units, phases, and amplitudes. Compared with the previous studies, our approach mitigates model assumptions, avoids intricate calculations, such as LU factorization or low-rank approximation, and only needs three fast Fourier transforms at each time step. In addition, the graphic processing unit technique is used to dramatically accelerate various functions of ERTM, such as wavefields extrapolation, decomposition, and imaging. Three synthetic examples demonstrate the effectiveness and feasibility of our proposed approach.en_US
dc.identifier.citationZhang, Lele, Liu, Lu, Niu, Fenglin, et al.. "A novel and efficient engine for P-/S-wave-mode vector decomposition for vertical transverse isotropic elastic reverse time migration." <i>Geophysics,</i> 87, no. 4 (2022) Society of Exploration Geophysicists: A49-WB54. https://doi.org/10.1190/geo2021-0609.1.en_US
dc.identifier.doihttps://doi.org/10.1190/geo2021-0609.1en_US
dc.identifier.urihttps://hdl.handle.net/1911/112664en_US
dc.language.isoengen_US
dc.publisherSociety of Exploration Geophysicistsen_US
dc.titleA novel and efficient engine for P-/S-wave-mode vector decomposition for vertical transverse isotropic elastic reverse time migrationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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