Detection of Open Fractures with Vertical Seismic Profiling
In Vertical Seismic Profiling surveys tube waves are generated by compressional waves impinging on subsurface fractures or permeable zones. The problem of generation of these waves by a non-normal incident P wave for an inclined borehole intersecting a tilted parallel wall fracture is formulated the...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Technical Report |
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Massachusetts Institute of Technology. Earth Resources Laboratory
2012
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| Online Access: | http://hdl.handle.net/1721.1/75038 |
| _version_ | 1826214298726170624 |
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| author | Beydoun, W. B. Cheng, C. H. Toksoz, M. N. |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Beydoun, W. B. Cheng, C. H. Toksoz, M. N. |
| author_sort | Beydoun, W. B. |
| collection | MIT |
| description | In Vertical Seismic Profiling surveys tube waves are generated by compressional waves impinging on subsurface fractures or permeable zones. The problem of generation of these waves by a non-normal incident P wave for an inclined borehole intersecting a tilted parallel wall fracture is formulated theoretically. The amplitude of tube waves depends on the permeability, the length of the fracture, and on the frequency. The relative effects of these parameters are studied individually. The problem is also formulated for a thin oblate ellipsoidal (penny-shaped) fracture. The results for the two fracture
models are compared and contrasted. Field data from Tyngsboro, Massachusetts are shown for open fractures in granite. From tube wave amplitudes normalized to P wave amplitudes, calculated permeabilities are on the order of one hundred millidarcys. |
| first_indexed | 2024-09-23T16:03:20Z |
| format | Technical Report |
| id | mit-1721.1/75038 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T16:03:20Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/750382019-04-12T20:28:02Z Detection of Open Fractures with Vertical Seismic Profiling Beydoun, W. B. Cheng, C. H. Toksoz, M. N. Massachusetts Institute of Technology. Earth Resources Laboratory Beydoun, W. B. Cheng, C. H. Toksoz, M. N. In Vertical Seismic Profiling surveys tube waves are generated by compressional waves impinging on subsurface fractures or permeable zones. The problem of generation of these waves by a non-normal incident P wave for an inclined borehole intersecting a tilted parallel wall fracture is formulated theoretically. The amplitude of tube waves depends on the permeability, the length of the fracture, and on the frequency. The relative effects of these parameters are studied individually. The problem is also formulated for a thin oblate ellipsoidal (penny-shaped) fracture. The results for the two fracture models are compared and contrasted. Field data from Tyngsboro, Massachusetts are shown for open fractures in granite. From tube wave amplitudes normalized to P wave amplitudes, calculated permeabilities are on the order of one hundred millidarcys. Massachusetts Institute of Technology. Full Waveform Acoustic Logging Consortium 2012-11-27T19:35:45Z 2012-11-27T19:35:45Z 1984-01-01 Technical Report http://hdl.handle.net/1721.1/75038 Earth Resources Laboratory Industry Consortia Annual Report;1984-11 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Beydoun, W. B. Cheng, C. H. Toksoz, M. N. Detection of Open Fractures with Vertical Seismic Profiling |
| title | Detection of Open Fractures with Vertical Seismic Profiling |
| title_full | Detection of Open Fractures with Vertical Seismic Profiling |
| title_fullStr | Detection of Open Fractures with Vertical Seismic Profiling |
| title_full_unstemmed | Detection of Open Fractures with Vertical Seismic Profiling |
| title_short | Detection of Open Fractures with Vertical Seismic Profiling |
| title_sort | detection of open fractures with vertical seismic profiling |
| url | http://hdl.handle.net/1721.1/75038 |
| work_keys_str_mv | AT beydounwb detectionofopenfractureswithverticalseismicprofiling AT chengch detectionofopenfractureswithverticalseismicprofiling AT toksozmn detectionofopenfractureswithverticalseismicprofiling |