Using DAS for reflection seismology-lessons learned from three field studies
Distributed acoustic sensing (DAS) has rapidly gained recognition for its potential for seismic imaging. For surface reflection seismology, the wide spatial aperture afforded by DAS is a primary motivation for its application, however the lower SNR of DAS has proven to be a significant impediment to...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Conference Paper |
| Published: |
2017
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| Online Access: | https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/265544 http://hdl.handle.net/20.500.11937/80828 |
| _version_ | 1848764280137056256 |
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| author | Freifeld, B.M. Dou, S. Ajo Franklin, J.B. Robertson, M. Wood, T. Daley, T. White, D.J. Worth, K. Pevzner, R. Yavuz, Sinem Correa, J. McDonald, S. |
| author_facet | Freifeld, B.M. Dou, S. Ajo Franklin, J.B. Robertson, M. Wood, T. Daley, T. White, D.J. Worth, K. Pevzner, R. Yavuz, Sinem Correa, J. McDonald, S. |
| author_sort | Freifeld, B.M. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Distributed acoustic sensing (DAS) has rapidly gained recognition for its potential for seismic imaging. For surface reflection seismology, the wide spatial aperture afforded by DAS is a primary motivation for its application, however the lower SNR of DAS has proven to be a significant impediment to acquiring data that can replace conventional receiver arrays. A further limitation of DAS cables is that the strain-dependent response is insensitive to acoustic energy which arrives orthogonal to the cable axis, reducing its effectiveness at seeing energy reflected from the deep subsurface. To enhance the sensitivity of DAS cables for reflection seismology, we have trialed at three field sites DAS cables with helical construction in which there is a significant component of optical fiber that is coincident with arriving broadside energy. We have installed helically wound DAS cables at the PTRC Aquistore Project in Saskatchewan, Canada and the CO2CRC Otway Project in Nirranda South, Victoria, Australia in shallow trenches. For the ADM Intelligent Monitoring Systems Project in Decatur, Illinois, USA we used a horizontal directional drilling method to install DAS cables at a depth that is greater than can be achieved using trenched installation. At the Otway and ADM sites we operated surface orbital vibrators (SOVs) at fixed locations to enhance sensitivity by stacking large numbers of sweeps. We present survey results from the three sites. Analysis of both vibroseis survey and SOV results show that the helical cable design achieves its primary objective of improving sensitivity to reflected energy, with further gains needed to achieve the sensitivity of conventional geophones. |
| first_indexed | 2025-11-14T11:16:50Z |
| format | Conference Paper |
| id | curtin-20.500.11937-80828 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T11:16:50Z |
| publishDate | 2017 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-808282021-01-25T01:43:20Z Using DAS for reflection seismology-lessons learned from three field studies Freifeld, B.M. Dou, S. Ajo Franklin, J.B. Robertson, M. Wood, T. Daley, T. White, D.J. Worth, K. Pevzner, R. Yavuz, Sinem Correa, J. McDonald, S. Distributed acoustic sensing (DAS) has rapidly gained recognition for its potential for seismic imaging. For surface reflection seismology, the wide spatial aperture afforded by DAS is a primary motivation for its application, however the lower SNR of DAS has proven to be a significant impediment to acquiring data that can replace conventional receiver arrays. A further limitation of DAS cables is that the strain-dependent response is insensitive to acoustic energy which arrives orthogonal to the cable axis, reducing its effectiveness at seeing energy reflected from the deep subsurface. To enhance the sensitivity of DAS cables for reflection seismology, we have trialed at three field sites DAS cables with helical construction in which there is a significant component of optical fiber that is coincident with arriving broadside energy. We have installed helically wound DAS cables at the PTRC Aquistore Project in Saskatchewan, Canada and the CO2CRC Otway Project in Nirranda South, Victoria, Australia in shallow trenches. For the ADM Intelligent Monitoring Systems Project in Decatur, Illinois, USA we used a horizontal directional drilling method to install DAS cables at a depth that is greater than can be achieved using trenched installation. At the Otway and ADM sites we operated surface orbital vibrators (SOVs) at fixed locations to enhance sensitivity by stacking large numbers of sweeps. We present survey results from the three sites. Analysis of both vibroseis survey and SOV results show that the helical cable design achieves its primary objective of improving sensitivity to reflected energy, with further gains needed to achieve the sensitivity of conventional geophones. 2017 Conference Paper http://hdl.handle.net/20.500.11937/80828 https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/265544 restricted |
| spellingShingle | Freifeld, B.M. Dou, S. Ajo Franklin, J.B. Robertson, M. Wood, T. Daley, T. White, D.J. Worth, K. Pevzner, R. Yavuz, Sinem Correa, J. McDonald, S. Using DAS for reflection seismology-lessons learned from three field studies |
| title | Using DAS for reflection seismology-lessons learned from three field studies |
| title_full | Using DAS for reflection seismology-lessons learned from three field studies |
| title_fullStr | Using DAS for reflection seismology-lessons learned from three field studies |
| title_full_unstemmed | Using DAS for reflection seismology-lessons learned from three field studies |
| title_short | Using DAS for reflection seismology-lessons learned from three field studies |
| title_sort | using das for reflection seismology-lessons learned from three field studies |
| url | https://agu.confex.com/agu/fm17/meetingapp.cgi/Paper/265544 http://hdl.handle.net/20.500.11937/80828 |