Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment
The attenuation of borehole Stoneley waves across a permeable structure (e.g., fractures or fracture zone) is correlated with the permeability of the structure. Using a simplified Biot theory, the structure can be modelled as a permeable porous layer intersecting the borehole. In order to study th...
| 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/1721.1/75187 |
| _version_ | 1826214034989383680 |
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| author | Zhu, Zhenya Tang, Xiaoming 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 Tang, Xiaoming Cheng, C. H. Toksoz, M. N. |
| author_sort | Zhu, Zhenya |
| collection | MIT |
| description | The attenuation of borehole Stoneley waves across a permeable structure (e.g., fractures
or fracture zone) is correlated with the permeability of the structure. Using a
simplified Biot theory, the structure can be modelled as a permeable porous layer intersecting the borehole. In order to study the effect of such a structure on Stoneley waves and to evaluate the theoretical model, we performed laboratory experiments using ultrasonic borehole models. The porous layer model is made of fine-grained sands with
high permeability and porosity. The experiments are carried out with three saturant
fluids: water, alcohol, and glycerol. The iso-offset Stoneley waveforms are recorded by
moving the source and receiver across the porous layer. In this way, robust estimates
of Stoneley wave transmission coefficients are obtained. The experimental transmission
coefficients are compared with the theoretical coefficients calculated using the borehole
and permeable zone parameters. There is good agreement between theoretical results
and experimental results. For low viscosity fluid water and ethyl alcohol, the agreement
is very good. For high viscosity fluid, glycerol, the agreement is fair with the
experimental Stoneley attenuation higher than the theoretical value. |
| first_indexed | 2024-09-23T15:58:46Z |
| format | Technical Report |
| id | mit-1721.1/75187 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T15:58:46Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/751872019-04-12T20:31:21Z Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment Zhu, Zhenya Tang, Xiaoming Cheng, C. H. Toksoz, M. N. Massachusetts Institute of Technology. Earth Resources Laboratory Zhu, Zhenya Cheng, C. H. Toksoz, M. N. The attenuation of borehole Stoneley waves across a permeable structure (e.g., fractures or fracture zone) is correlated with the permeability of the structure. Using a simplified Biot theory, the structure can be modelled as a permeable porous layer intersecting the borehole. In order to study the effect of such a structure on Stoneley waves and to evaluate the theoretical model, we performed laboratory experiments using ultrasonic borehole models. The porous layer model is made of fine-grained sands with high permeability and porosity. The experiments are carried out with three saturant fluids: water, alcohol, and glycerol. The iso-offset Stoneley waveforms are recorded by moving the source and receiver across the porous layer. In this way, robust estimates of Stoneley wave transmission coefficients are obtained. The experimental transmission coefficients are compared with the theoretical coefficients calculated using the borehole and permeable zone parameters. There is good agreement between theoretical results and experimental results. For low viscosity fluid water and ethyl alcohol, the agreement is very good. For high viscosity fluid, glycerol, the agreement is fair with the experimental Stoneley attenuation higher than the theoretical value. Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium United States. Dept. of Energy (Grant DE-FG02-86ER13636) 2012-12-04T14:44:17Z 2012-12-04T14:44:17Z 1992 Technical Report http://hdl.handle.net/1721.1/75187 Earth Resources Laboratory Industry Consortia Annual Report;1992-04 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Zhu, Zhenya Tang, Xiaoming Cheng, C. H. Toksoz, M. N. Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment |
| title | Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment |
| title_full | Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment |
| title_fullStr | Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment |
| title_full_unstemmed | Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment |
| title_short | Borehole Stoneley Wave Propagation Across Permeable Structures: Comparison Between Theory And Experiment |
| title_sort | borehole stoneley wave propagation across permeable structures comparison between theory and experiment |
| url | http://hdl.handle.net/1721.1/75187 |
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