Thomsen's parameters from p-wave measurements in a spherical sample
The aim of this paper is to understand the seismic anisotropy of the overburden shale in an oilfield in the North West Shelf of Western Australia. To this end, we first find the orientation of the symmetry axis of a spherical shale sample from measurements of ultrasonic P-wave velocities in 132 dire...
| Main Authors: | , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing Ltd.
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/17333 |
| _version_ | 1848749437969498112 |
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| author | Bona, Andrej Nadri, D. Brajanovski, Miroslav |
| author_facet | Bona, Andrej Nadri, D. Brajanovski, Miroslav |
| author_sort | Bona, Andrej |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The aim of this paper is to understand the seismic anisotropy of the overburden shale in an oilfield in the North West Shelf of Western Australia. To this end, we first find the orientation of the symmetry axis of a spherical shale sample from measurements of ultrasonic P-wave velocities in 132 directions at the reservoir pressure. After transforming the data to the symmetry axis coordinates, we find Thomsen's anisotropy parameters δ and ɛ using these measurements and measurements of the shear-wave velocity along the symmetry axis from a well log. To find these anisotropy parameters, we use a very fast simulated re-annealing algorithm with an objective function that contains only the measured ray velocities, their numerical derivatives and the unknown elasticity parameters. The results show strong elliptical anisotropy in the overburden shale. This approach produces smaller uncertainty of Thomsen parameter δ than more direct approaches. |
| first_indexed | 2025-11-14T07:20:56Z |
| format | Journal Article |
| id | curtin-20.500.11937-17333 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:20:56Z |
| publishDate | 2010 |
| publisher | Wiley-Blackwell Publishing Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-173332017-09-13T15:43:06Z Thomsen's parameters from p-wave measurements in a spherical sample Bona, Andrej Nadri, D. Brajanovski, Miroslav Annealing Azimuth Spherical The aim of this paper is to understand the seismic anisotropy of the overburden shale in an oilfield in the North West Shelf of Western Australia. To this end, we first find the orientation of the symmetry axis of a spherical shale sample from measurements of ultrasonic P-wave velocities in 132 directions at the reservoir pressure. After transforming the data to the symmetry axis coordinates, we find Thomsen's anisotropy parameters δ and ɛ using these measurements and measurements of the shear-wave velocity along the symmetry axis from a well log. To find these anisotropy parameters, we use a very fast simulated re-annealing algorithm with an objective function that contains only the measured ray velocities, their numerical derivatives and the unknown elasticity parameters. The results show strong elliptical anisotropy in the overburden shale. This approach produces smaller uncertainty of Thomsen parameter δ than more direct approaches. 2010 Journal Article http://hdl.handle.net/20.500.11937/17333 10.1111/j.1365-2478.2010.00917.x Wiley-Blackwell Publishing Ltd. restricted |
| spellingShingle | Annealing Azimuth Spherical Bona, Andrej Nadri, D. Brajanovski, Miroslav Thomsen's parameters from p-wave measurements in a spherical sample |
| title | Thomsen's parameters from p-wave measurements in a spherical sample |
| title_full | Thomsen's parameters from p-wave measurements in a spherical sample |
| title_fullStr | Thomsen's parameters from p-wave measurements in a spherical sample |
| title_full_unstemmed | Thomsen's parameters from p-wave measurements in a spherical sample |
| title_short | Thomsen's parameters from p-wave measurements in a spherical sample |
| title_sort | thomsen's parameters from p-wave measurements in a spherical sample |
| topic | Annealing Azimuth Spherical |
| url | http://hdl.handle.net/20.500.11937/17333 |