Multi-Shot Processing For Better Velocity Determination
We perform a technique called multi-shot processing on a section of 12-channel sonic logs in order to better resolve compressional and shear velocities. The data are from the ODP Leg 102 cruise, which occupied drill site 418A near the Bermuda Rise in 1985. Multi-shot processing has been done on a...
| 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/1721.1/75145 |
| _version_ | 1811073702238879744 |
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| author | Thompson, Delaine Burns, Dan |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Thompson, Delaine Burns, Dan |
| author_sort | Thompson, Delaine |
| collection | MIT |
| description | We perform a technique called multi-shot processing on a section of 12-channel sonic
logs in order to better resolve compressional and shear velocities. The data are from
the ODP Leg 102 cruise, which occupied drill site 418A near the Bermuda Rise in 1985.
Multi-shot processing has been done on a 9 meter section of this data, using different
combinations of numbers of shots vs. numbers of receivers in an attempt to compare
the vertical resolution and stability of this processing method. The method is stable
only with certain shot-to-receiver subarray combinations. This paper demonstrates
that the optimum combinations using this set of data are 4 shots with 6 receivers
apiece, and 3 shots with 8 receivers each. While a combination using 5 shots with 4
receivers is possible, the method produces spurious results. This may be because of
spatial aliasing over too few receivers, or it may be a result of poor outside control
over the entire experiment (ship heave, etc.). It is hoped that an optimum subarray
combination can be used to resolve velocities over shorter array lengths using the
redundancy in the sonic data. This would result in a greater ability to characterize
fracturing and alteration in the oceanic crust, since velocity variations have been shown
to correlate with fracture zones. |
| first_indexed | 2024-09-23T09:37:12Z |
| format | Technical Report |
| id | mit-1721.1/75145 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T09:37:12Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/751452019-04-12T20:31:13Z Multi-Shot Processing For Better Velocity Determination Thompson, Delaine Burns, Dan Massachusetts Institute of Technology. Earth Resources Laboratory Thompson, Delaine We perform a technique called multi-shot processing on a section of 12-channel sonic logs in order to better resolve compressional and shear velocities. The data are from the ODP Leg 102 cruise, which occupied drill site 418A near the Bermuda Rise in 1985. Multi-shot processing has been done on a 9 meter section of this data, using different combinations of numbers of shots vs. numbers of receivers in an attempt to compare the vertical resolution and stability of this processing method. The method is stable only with certain shot-to-receiver subarray combinations. This paper demonstrates that the optimum combinations using this set of data are 4 shots with 6 receivers apiece, and 3 shots with 8 receivers each. While a combination using 5 shots with 4 receivers is possible, the method produces spurious results. This may be because of spatial aliasing over too few receivers, or it may be a result of poor outside control over the entire experiment (ship heave, etc.). It is hoped that an optimum subarray combination can be used to resolve velocities over shorter array lengths using the redundancy in the sonic data. This would result in a greater ability to characterize fracturing and alteration in the oceanic crust, since velocity variations have been shown to correlate with fracture zones. Massachusetts Institute of Technology. Full Waveform Acoustic Logging Consortium National Science Foundation (U.S.) (Grant OCE89-00316) 2012-12-03T18:11:53Z 2012-12-03T18:11:53Z 1989 Technical Report http://hdl.handle.net/1721.1/75145 Earth Resources Laboratory Industry Consortia Annual Report;1989-09 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Thompson, Delaine Burns, Dan Multi-Shot Processing For Better Velocity Determination |
| title | Multi-Shot Processing For Better Velocity Determination |
| title_full | Multi-Shot Processing For Better Velocity Determination |
| title_fullStr | Multi-Shot Processing For Better Velocity Determination |
| title_full_unstemmed | Multi-Shot Processing For Better Velocity Determination |
| title_short | Multi-Shot Processing For Better Velocity Determination |
| title_sort | multi shot processing for better velocity determination |
| url | http://hdl.handle.net/1721.1/75145 |
| work_keys_str_mv | AT thompsondelaine multishotprocessingforbettervelocitydetermination AT burnsdan multishotprocessingforbettervelocitydetermination |