Uncertainties in local anisotropy estimation from multi-offset VSP Data
We have quantified the errors associated with VTI parameter estimation using multi-offset VSP data. Two common methods, P-wave slownesses only and slowness-polarization are investigated. Estimation errors are expressed in terms of the magnitude of the earth anisotropy, uncertainties related to first...
| Main Authors: | , , , , |
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| Format: | Conference Paper |
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EAGE
2012
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| Online Access: | http://www.earthdoc.org http://hdl.handle.net/20.500.11937/12241 |
| _version_ | 1848748023058792448 |
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| author | Asgharzadeh, Mehdi Bona, Andrej Pevzner, Roman Urosevic, Milovan Gurevich, Boris |
| author2 | EAGE |
| author_facet | EAGE Asgharzadeh, Mehdi Bona, Andrej Pevzner, Roman Urosevic, Milovan Gurevich, Boris |
| author_sort | Asgharzadeh, Mehdi |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We have quantified the errors associated with VTI parameter estimation using multi-offset VSP data. Two common methods, P-wave slownesses only and slowness-polarization are investigated. Estimation errors are expressed in terms of the magnitude of the earth anisotropy, uncertainties related to first break pickings and maximum available source offset. For homogeneous overburden, P-wave slownesses technique can be used to estimate VTI parameters. We demonstrate that estimation errors of using only P-wave slownesses are significantly decreased as longer source offsets are included in the inversion algorithm. Larger offsets involve P-waves which propagate near horizontal at the receiver level and enhance the method's efficiency. An example synthetic VSP is presented next where P-wave slownesses technique successfully recovers VTI model parameters. In case of heterogeneous overburden, P-wave slowness-polarization technique seems to be a solution as there is no need to compute P-wave horizontal slownesses. However, we demonstrate that the errors of VTI parameter estimation using this technique are small only where the anisotropy is very weak (below 5%) and they are not improved by increasing the offset. Furthermore, wave interference effect on polarizations makes the method impractical even on noise free synthetic data. |
| first_indexed | 2025-11-14T06:58:27Z |
| format | Conference Paper |
| id | curtin-20.500.11937-12241 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:58:27Z |
| publishDate | 2012 |
| publisher | EAGE |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-122412017-03-08T13:31:52Z Uncertainties in local anisotropy estimation from multi-offset VSP Data Asgharzadeh, Mehdi Bona, Andrej Pevzner, Roman Urosevic, Milovan Gurevich, Boris EAGE We have quantified the errors associated with VTI parameter estimation using multi-offset VSP data. Two common methods, P-wave slownesses only and slowness-polarization are investigated. Estimation errors are expressed in terms of the magnitude of the earth anisotropy, uncertainties related to first break pickings and maximum available source offset. For homogeneous overburden, P-wave slownesses technique can be used to estimate VTI parameters. We demonstrate that estimation errors of using only P-wave slownesses are significantly decreased as longer source offsets are included in the inversion algorithm. Larger offsets involve P-waves which propagate near horizontal at the receiver level and enhance the method's efficiency. An example synthetic VSP is presented next where P-wave slownesses technique successfully recovers VTI model parameters. In case of heterogeneous overburden, P-wave slowness-polarization technique seems to be a solution as there is no need to compute P-wave horizontal slownesses. However, we demonstrate that the errors of VTI parameter estimation using this technique are small only where the anisotropy is very weak (below 5%) and they are not improved by increasing the offset. Furthermore, wave interference effect on polarizations makes the method impractical even on noise free synthetic data. 2012 Conference Paper http://hdl.handle.net/20.500.11937/12241 http://www.earthdoc.org http://www.earthdoc.org/publication/publicationdetails/?publication=58906 EAGE fulltext |
| spellingShingle | Asgharzadeh, Mehdi Bona, Andrej Pevzner, Roman Urosevic, Milovan Gurevich, Boris Uncertainties in local anisotropy estimation from multi-offset VSP Data |
| title | Uncertainties in local anisotropy estimation from multi-offset VSP Data |
| title_full | Uncertainties in local anisotropy estimation from multi-offset VSP Data |
| title_fullStr | Uncertainties in local anisotropy estimation from multi-offset VSP Data |
| title_full_unstemmed | Uncertainties in local anisotropy estimation from multi-offset VSP Data |
| title_short | Uncertainties in local anisotropy estimation from multi-offset VSP Data |
| title_sort | uncertainties in local anisotropy estimation from multi-offset vsp data |
| url | http://www.earthdoc.org http://www.earthdoc.org http://hdl.handle.net/20.500.11937/12241 |