Parameterization of elastic stress sensitivity in shales
Stress dependency and anisotropy of dynamic elastic properties of shales is important for a number of geophysical applications, including seismic interpretation, fluid identification, and 4D seismic monitoring. Using Sayers-Kachanov formalism, we developed a new model for transversely isotropic (TI)...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Society of Exploration Geophysics
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/16139 |
| _version_ | 1848749088754892800 |
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| author | Pervukhina, M. Gurevich, Boris Golodoniuc, Pavel Dewhurst, D. |
| author_facet | Pervukhina, M. Gurevich, Boris Golodoniuc, Pavel Dewhurst, D. |
| author_sort | Pervukhina, M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Stress dependency and anisotropy of dynamic elastic properties of shales is important for a number of geophysical applications, including seismic interpretation, fluid identification, and 4D seismic monitoring. Using Sayers-Kachanov formalism, we developed a new model for transversely isotropic (TI) media that describes stress sensitivity behavior of all five elastic coefficients using four physically meaningful parameters. The model is used to parameterize elastic properties of about 20 shales obtained from laboratory measurements and the literature. The four fitting parameters, namely, specific tangential compliance of a single crack, ratio of normal to tangential compliances, characteristic pressure, and crack orientation anisotropy parameter, show moderate to good correlations with the depth from which the shale was extracted. With increasing depth, the tangential compliance exponentially decreases. The crack orientation anisotropy parameter broadly increases with depth for most of the shales, indicating that cracks are getting more aligned in the bedding plane. The ratio of normal to shear compliance and characteristic pressure decreases with depth to 2500 m and then increases below this to 3600 m.This may allow the reconstruction of the stress dependency of all five elastic compliances of a shale from log data, for example. |
| first_indexed | 2025-11-14T07:15:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-16139 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:15:23Z |
| publishDate | 2011 |
| publisher | Society of Exploration Geophysics |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-161392018-09-07T01:20:00Z Parameterization of elastic stress sensitivity in shales Pervukhina, M. Gurevich, Boris Golodoniuc, Pavel Dewhurst, D. elasticity cracks seismology well logging rocks Stress dependency and anisotropy of dynamic elastic properties of shales is important for a number of geophysical applications, including seismic interpretation, fluid identification, and 4D seismic monitoring. Using Sayers-Kachanov formalism, we developed a new model for transversely isotropic (TI) media that describes stress sensitivity behavior of all five elastic coefficients using four physically meaningful parameters. The model is used to parameterize elastic properties of about 20 shales obtained from laboratory measurements and the literature. The four fitting parameters, namely, specific tangential compliance of a single crack, ratio of normal to tangential compliances, characteristic pressure, and crack orientation anisotropy parameter, show moderate to good correlations with the depth from which the shale was extracted. With increasing depth, the tangential compliance exponentially decreases. The crack orientation anisotropy parameter broadly increases with depth for most of the shales, indicating that cracks are getting more aligned in the bedding plane. The ratio of normal to shear compliance and characteristic pressure decreases with depth to 2500 m and then increases below this to 3600 m.This may allow the reconstruction of the stress dependency of all five elastic compliances of a shale from log data, for example. 2011 Journal Article http://hdl.handle.net/20.500.11937/16139 10.1190/1.3554401 Society of Exploration Geophysics fulltext |
| spellingShingle | elasticity cracks seismology well logging rocks Pervukhina, M. Gurevich, Boris Golodoniuc, Pavel Dewhurst, D. Parameterization of elastic stress sensitivity in shales |
| title | Parameterization of elastic stress sensitivity in shales |
| title_full | Parameterization of elastic stress sensitivity in shales |
| title_fullStr | Parameterization of elastic stress sensitivity in shales |
| title_full_unstemmed | Parameterization of elastic stress sensitivity in shales |
| title_short | Parameterization of elastic stress sensitivity in shales |
| title_sort | parameterization of elastic stress sensitivity in shales |
| topic | elasticity cracks seismology well logging rocks |
| url | http://hdl.handle.net/20.500.11937/16139 |