S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application
From polarization analysis on a covariance matrix, a method of S-wave splitting analysis is developed, which processes 3-component recordings simultaneously, rather than just 2 horizontal components as done traditionally. Thus not only orientation, but also dip information of fractures can be resolv...
| 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/1721.1/68617 |
| _version_ | 1811071117615431680 |
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| author | Li, Xu Sze, Edmond Burns, Daniel R. Toksoz, M. Nafi |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Li, Xu Sze, Edmond Burns, Daniel R. Toksoz, M. Nafi |
| author_sort | Li, Xu |
| collection | MIT |
| description | From polarization analysis on a covariance matrix, a method of S-wave splitting analysis is developed, which processes 3-component recordings simultaneously, rather than just 2 horizontal components as done traditionally. Thus not only orientation, but also dip information of fractures can be resolved. The synthetic test results show that this method is stable even for noise levels as high as 100% (S/N=1). If time window sizes are larger than roughly twice the time delay between the fast and slow S waves, the results are always reasonable even with noise levels up to 50%.The method is applied to 12 microseismic events recorded from a producing reservoir. The preliminary results suggest that stress-aligned fractures strike in NE-SW direction in the reservoir. The dips of the fractures are primarily vertical. The time difference between the fast and slow shear waves is about several tens of milliseconds per kilometer. |
| first_indexed | 2024-09-23T08:46:19Z |
| format | Technical Report |
| id | mit-1721.1/68617 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T08:46:19Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/686172019-04-10T07:26:14Z S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application Li, Xu Sze, Edmond Burns, Daniel R. Toksoz, M. Nafi Massachusetts Institute of Technology. Earth Resources Laboratory Li, Xu Sze, Edmond Burns, Daniel R. Toksoz, M. Nafi From polarization analysis on a covariance matrix, a method of S-wave splitting analysis is developed, which processes 3-component recordings simultaneously, rather than just 2 horizontal components as done traditionally. Thus not only orientation, but also dip information of fractures can be resolved. The synthetic test results show that this method is stable even for noise levels as high as 100% (S/N=1). If time window sizes are larger than roughly twice the time delay between the fast and slow S waves, the results are always reasonable even with noise levels up to 50%.The method is applied to 12 microseismic events recorded from a producing reservoir. The preliminary results suggest that stress-aligned fractures strike in NE-SW direction in the reservoir. The dips of the fractures are primarily vertical. The time difference between the fast and slow shear waves is about several tens of milliseconds per kilometer. United States. Dept. of Energy (grant DE.FC03-015F22398) Massachusetts Institute of Technology. Earth Resources Laboratory 2012-01-20T18:11:04Z 2012-01-20T18:11:04Z 2004 Technical Report http://hdl.handle.net/1721.1/68617 Earth Resources Laboratory Industry Consortia Annual Report;2004-06 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Li, Xu Sze, Edmond Burns, Daniel R. Toksoz, M. Nafi S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application |
| title | S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application |
| title_full | S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application |
| title_fullStr | S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application |
| title_full_unstemmed | S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application |
| title_short | S-wave Splitting Analysis: Covariance Matrix Method and Preliminary Application |
| title_sort | s wave splitting analysis covariance matrix method and preliminary application |
| url | http://hdl.handle.net/1721.1/68617 |
| work_keys_str_mv | AT lixu swavesplittinganalysiscovariancematrixmethodandpreliminaryapplication AT szeedmond swavesplittinganalysiscovariancematrixmethodandpreliminaryapplication AT burnsdanielr swavesplittinganalysiscovariancematrixmethodandpreliminaryapplication AT toksozmnafi swavesplittinganalysiscovariancematrixmethodandpreliminaryapplication |