A comparison of LWD and wireline dipole sonic data
Data measured by both wireline and LWD tools in the same borehole are compared. Discrepancies in shear velocities as calculated from the data are on average around 5% and discrepancies between compressional velocities are less than 3%. The consistency of the bias between logs suggest it is related t...
| 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/1721.1/68623 |
| _version_ | 1811082046076878848 |
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| author | Briggs, Victoria Rao, Rama V. N. Grandi, Samantha K. Burns, Daniel R. Chi, Shihong |
| author2 | Massachusetts Institute of Technology. Earth Resources Laboratory |
| author_facet | Massachusetts Institute of Technology. Earth Resources Laboratory Briggs, Victoria Rao, Rama V. N. Grandi, Samantha K. Burns, Daniel R. Chi, Shihong |
| author_sort | Briggs, Victoria |
| collection | MIT |
| description | Data measured by both wireline and LWD tools in the same borehole are compared. Discrepancies in shear velocities as calculated from the data are on average around 5% and discrepancies between compressional velocities are less than 3%. The consistency of the bias between logs suggest it is related to the calculation of velocity. Comparison of industry and ERL velocity processing show excellent agreement and give an example of possible spread of velocity data due to processing chain. A short section of data in an unconsolidated zone shows velocity differences of just over 10% with an opposite trend to the over all bias. Dispersion analysis of the waveforms show this is consistent with a damaged zone surrounding the borehole wall caused by drilling. |
| first_indexed | 2024-09-23T11:56:34Z |
| format | Technical Report |
| id | mit-1721.1/68623 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:56:34Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology. Earth Resources Laboratory |
| record_format | dspace |
| spelling | mit-1721.1/686232019-04-11T06:24:50Z A comparison of LWD and wireline dipole sonic data Briggs, Victoria Rao, Rama V. N. Grandi, Samantha K. Burns, Daniel R. Chi, Shihong Massachusetts Institute of Technology. Earth Resources Laboratory Briggs, Victoria Rao, Rama V. N. Grandi, Samantha K. Burns, Daniel R. Chi, Shihong Data measured by both wireline and LWD tools in the same borehole are compared. Discrepancies in shear velocities as calculated from the data are on average around 5% and discrepancies between compressional velocities are less than 3%. The consistency of the bias between logs suggest it is related to the calculation of velocity. Comparison of industry and ERL velocity processing show excellent agreement and give an example of possible spread of velocity data due to processing chain. A short section of data in an unconsolidated zone shows velocity differences of just over 10% with an opposite trend to the over all bias. Dispersion analysis of the waveforms show this is consistent with a damaged zone surrounding the borehole wall caused by drilling. Massachusetts Institute of Technology. Earth Resources Laboratory Massachusetts Institute of Technology. Borehole Acoustics and Logging Consortium 2012-01-20T18:49:47Z 2012-01-20T18:49:47Z 2004 Technical Report http://hdl.handle.net/1721.1/68623 Earth Resources Laboratory Industry Consortia Annual Report;2004-12 application/pdf Massachusetts Institute of Technology. Earth Resources Laboratory |
| spellingShingle | Briggs, Victoria Rao, Rama V. N. Grandi, Samantha K. Burns, Daniel R. Chi, Shihong A comparison of LWD and wireline dipole sonic data |
| title | A comparison of LWD and wireline dipole sonic data |
| title_full | A comparison of LWD and wireline dipole sonic data |
| title_fullStr | A comparison of LWD and wireline dipole sonic data |
| title_full_unstemmed | A comparison of LWD and wireline dipole sonic data |
| title_short | A comparison of LWD and wireline dipole sonic data |
| title_sort | comparison of lwd and wireline dipole sonic data |
| url | http://hdl.handle.net/1721.1/68623 |
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