Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model
Flexural waves generated by a dipole source have been studied theoretically and used to estimate the shear parameters of a formation. The basic principles and main properties of flexural waves propagating in a borehole are reviewed in this paper. A mono/dipole transducer made of a PZT piezoelectr...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Technical Report |
| Published: |
Massachusetts Institute of Technology. Earth Resources Laboratory
2012
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| Online Access: | http://hdl.handle.net/1721.1/75201 |
| _version_ | 1826201251853893632 |
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| author | Zhu, Zhenya Cheng, C. H. Toksoz, M. N. |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Zhu, Zhenya Cheng, C. H. Toksoz, M. N. |
| author_sort | Zhu, Zhenya |
| collection | MIT |
| description | Flexural waves generated by a dipole source have been studied theoretically and used to
estimate the shear parameters of a formation. The basic principles and main properties
of flexural waves propagating in a borehole are reviewed in this paper. A mono/dipole
transducer made of a PZT piezoelectric tube is used for laboratory experiments in
borehole models. The radiation pattern of the dipole source is measured in a water
tank. In order to simulate the hard and soft formations, measurements are performed
in borehole models made of aluminum and lucite, respectively. Experimental results
are in good agreement with the theoretical dispersion characteristics. Measurements
are also performed with the transducers in an azimuthally anisotropic borehole model
made of Phenolite XX-324. Both fast and slow flexural waves with different velocities are
generated by a dipole source in the model. The flexural waves are related to the fast or
slow shear waves in the anisotropic material. Experimental results show that the flexural
wave splits into a fast and a slow component in an azimuthally anisotropic borehole;
therefore, dipole acoustic well logging could be an effective means for estimating a
formation's anisotropy. |
| first_indexed | 2024-09-23T11:49:10Z |
| format | Technical Report |
| id | mit-1721.1/75201 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:49:10Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/752012019-04-10T18:05:09Z Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model Zhu, Zhenya Cheng, C. H. Toksoz, M. N. Massachusetts Institute of Technology. Earth Resources Laboratory Zhu, Zhenya Cheng, C. H. Toksoz, M. N. Flexural waves generated by a dipole source have been studied theoretically and used to estimate the shear parameters of a formation. The basic principles and main properties of flexural waves propagating in a borehole are reviewed in this paper. A mono/dipole transducer made of a PZT piezoelectric tube is used for laboratory experiments in borehole models. The radiation pattern of the dipole source is measured in a water tank. In order to simulate the hard and soft formations, measurements are performed in borehole models made of aluminum and lucite, respectively. Experimental results are in good agreement with the theoretical dispersion characteristics. Measurements are also performed with the transducers in an azimuthally anisotropic borehole model made of Phenolite XX-324. Both fast and slow flexural waves with different velocities are generated by a dipole source in the model. The flexural waves are related to the fast or slow shear waves in the anisotropic material. Experimental results show that the flexural wave splits into a fast and a slow component in an azimuthally anisotropic borehole; therefore, dipole acoustic well logging could be an effective means for estimating a formation's anisotropy. Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium United States. Dept. of Energy (Grant DE-FG0286ER13636) 2012-12-04T16:11:55Z 2012-12-04T16:11:55Z 1993 Technical Report http://hdl.handle.net/1721.1/75201 Earth Resources Laboratory Industry Consortia Annual Report;1993-04 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Zhu, Zhenya Cheng, C. H. Toksoz, M. N. Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model |
| title | Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model |
| title_full | Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model |
| title_fullStr | Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model |
| title_full_unstemmed | Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model |
| title_short | Propagation Of Flexural Waves In An Azimuthally Anisotropic Borehole Model |
| title_sort | propagation of flexural waves in an azimuthally anisotropic borehole model |
| url | http://hdl.handle.net/1721.1/75201 |
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