Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock
Elastic wave velocities in rocks vary with stress due to the presence of discontinuities and microcracks within the rock. We analytically derive a model for seismic anisotropy caused by small triaxial stresses applied on a linearly isotropic elastic medium permeated by a distribution of cracks with...
| Main Authors: | , , , |
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| Format: | Conference Paper |
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EAGE
2013
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| Online Access: | http://www.earthdoc.org/publication/publicationdetails/?publication=73419 http://hdl.handle.net/20.500.11937/15342 |
| _version_ | 1848748867409936384 |
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| author | Gurevich, Boris Collet, O. Pervukhina, M. Madadi, M. |
| author2 | EAGE |
| author_facet | EAGE Gurevich, Boris Collet, O. Pervukhina, M. Madadi, M. |
| author_sort | Gurevich, Boris |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Elastic wave velocities in rocks vary with stress due to the presence of discontinuities and microcracks within the rock. We analytically derive a model for seismic anisotropy caused by small triaxial stresses applied on a linearly isotropic elastic medium permeated by a distribution of cracks with random orientations. This model predicts ellipsoidal anisotropy and also expresses the ratios of Thomsen’s parameters ε/γ as a function of the compliance and Poisson’s ratios in the three orthogonal planes of symmetry. We apply this model to fully estimate the elasticity tensor from log or VSP data and infer P-wave anisotropy from S-wave anisotropy in an area where the anisotropy is known to result from anisotropy of stresses. Besides, this model could be used to differentiate stress-induced anisotropy from that caused by aligned fractures. |
| first_indexed | 2025-11-14T07:11:52Z |
| format | Conference Paper |
| id | curtin-20.500.11937-15342 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:11:52Z |
| publishDate | 2013 |
| publisher | EAGE |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-153422017-01-30T11:49:21Z Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock Gurevich, Boris Collet, O. Pervukhina, M. Madadi, M. EAGE Elastic wave velocities in rocks vary with stress due to the presence of discontinuities and microcracks within the rock. We analytically derive a model for seismic anisotropy caused by small triaxial stresses applied on a linearly isotropic elastic medium permeated by a distribution of cracks with random orientations. This model predicts ellipsoidal anisotropy and also expresses the ratios of Thomsen’s parameters ε/γ as a function of the compliance and Poisson’s ratios in the three orthogonal planes of symmetry. We apply this model to fully estimate the elasticity tensor from log or VSP data and infer P-wave anisotropy from S-wave anisotropy in an area where the anisotropy is known to result from anisotropy of stresses. Besides, this model could be used to differentiate stress-induced anisotropy from that caused by aligned fractures. 2013 Conference Paper http://hdl.handle.net/20.500.11937/15342 http://www.earthdoc.org/publication/publicationdetails/?publication=73419 EAGE restricted |
| spellingShingle | Gurevich, Boris Collet, O. Pervukhina, M. Madadi, M. Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock |
| title | Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock |
| title_full | Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock |
| title_fullStr | Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock |
| title_full_unstemmed | Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock |
| title_short | Anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock |
| title_sort | anisotropy pattern arising from application of a triaxial stress to a dry isotropic rock |
| url | http://www.earthdoc.org/publication/publicationdetails/?publication=73419 http://hdl.handle.net/20.500.11937/15342 |