Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements

Detalhes bibliográficos
Autor(a) principal: Zheng, Xuyao
Data de Publicação: 2002
Outros Autores: Pšenčík, I.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/7471
Resumo: Texto completo: acesso restrito. p. 1881-1905
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spelling Zheng, XuyaoPšenčík, I.Zheng, XuyaoPšenčík, I.2012-12-12T18:44:39Z2002-070033-4553http://www.repositorio.ufba.br/ri/handle/ri/7471v. 159, n. 7-8Texto completo: acesso restrito. p. 1881-1905We propose an algorithm for local evaluation of weak anisotropy (WA) parameters from measurements of slowness vector components and/or of particle motions of q P waves at individual receivers in a borehole in a multi-azimuthal multiple-source offset VSP experiment. As a byproduct the algorithm yields approximate angular variation of q P-wave phase velocity. The formulae are derived under assumption of weak but arbitrary anisotropy and lateral inhomogeneity of the medium. The algorithm is thus independent of structural complexities between the source and the receiver. If complete slowness vector is determinable from observed data, then the information about polarization can be used as an independent additional constraint. If only the component of the slowness along the borehole can be determined from observations (which is mostly the case), the inversion without information about polarization is impossible. We present several systems of equations which can be used when different numbers of components of the slowness vector are available. The SVD algorithm is used to solve an overdetermined system of linear equations for WA parameters for two test examples of synthetic multi-azimuthal multiple-source offset VSP data. The system of equations results from approximate first-order perturbation equations for the slowness and polarization vectors of the q P wave. Analysis of singular values and of variances of WA parameters is used for the estimation of chances to recover the sought parameters. Effects of varying number of profiles with sources and of noise added to “observed” data are illustrated. An important observation is that although, due to insufficient data, we often cannot recover all individual WA parameters with sufficient accuracy, angular phase velocity variation can be recovered rather well.Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2012-12-12T18:44:39Z No. of bitstreams: 1 art%253A10.1007%252Fs00024-002-8713-z.pdf: 744592 bytes, checksum: 87d79a15c7d4d1e577a670ade28877f6 (MD5)Made available in DSpace on 2012-12-12T18:44:39Z (GMT). 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dc.title.pt_BR.fl_str_mv Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
dc.title.alternative.pt_BR.fl_str_mv Pure and Applied Geophysics
title Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
spellingShingle Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
Zheng, Xuyao
Weak anisotropy
weak anisotropy parameters
qP waves
slowness vector
polarization vector
local inversion
multi-azimuthal VSP.
title_short Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
title_full Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
title_fullStr Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
title_full_unstemmed Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
title_sort Local determination of weak anisotropy parameters from qP-wave slowness and particle motion measurements
author Zheng, Xuyao
author_facet Zheng, Xuyao
Pšenčík, I.
author_role author
author2 Pšenčík, I.
author2_role author
dc.contributor.author.fl_str_mv Zheng, Xuyao
Pšenčík, I.
Zheng, Xuyao
Pšenčík, I.
dc.subject.por.fl_str_mv Weak anisotropy
weak anisotropy parameters
qP waves
slowness vector
polarization vector
local inversion
multi-azimuthal VSP.
topic Weak anisotropy
weak anisotropy parameters
qP waves
slowness vector
polarization vector
local inversion
multi-azimuthal VSP.
description Texto completo: acesso restrito. p. 1881-1905
publishDate 2002
dc.date.issued.fl_str_mv 2002-07
dc.date.accessioned.fl_str_mv 2012-12-12T18:44:39Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/7471
dc.identifier.issn.none.fl_str_mv 0033-4553
dc.identifier.number.pt_BR.fl_str_mv v. 159, n. 7-8
identifier_str_mv 0033-4553
v. 159, n. 7-8
url http://www.repositorio.ufba.br/ri/handle/ri/7471
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1007/s00024-002-8713-z
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
instacron:UFBA
instname_str Universidade Federal da Bahia (UFBA)
instacron_str UFBA
institution UFBA
reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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