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Method for removing the effect of near surface galvanic distortion in surface to borehole EM measurements |
Gary W. McNeice, Daniele Colombo, Mauro Pezzoli |
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Phase-based electromagnetic surveys for geological formations |
Ping Zhang, Michael J. Wilt, Jiuping Chen |
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Hybrid electric and magnetic surface to borehole and borehole to surface method |
Michael J. Wilt, Ping Zhang, Jiuping Chen, Daniele Colombo, Gary W. McNeice |
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Multi-electrode electric field downhole logging tool |
Herve Denaclara, Tomohito Yamazaki, James Minto, Ryosei Aoki |
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Method and apparatus to generate a crosswell data set |
Michael J. Wilt, Ping Zhang, Jiuping Chen |
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Analyzing subterranean formation with current source vectors |
David Alumbaugh, Edward Nichols |
2017-04-18 |
| 9395463 |
EM processing using field ratios |
Ping Zhang |
2016-07-19 |
| 8947093 |
Electromagnetic survey using naturally occurring electromagnetic fields as a source |
David Alumbaugh, Edward Nichols |
2015-02-03 |
| 8378685 |
Surveying a subterranean structure using a vertically oriented electromagnetic source |
H. Frank Morrison, David Alumbaugh |
2013-02-19 |
| 8289025 |
Deriving an electromagnetic field in one direction based on measurement data of one or more sensing elements for measuring an electromagnetic field in another direction |
Edward Nichols |
2012-10-16 |
| 8008921 |
Surveying using vertical electromagnetic sources that are towed along with survey receivers |
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Method for correcting magnetic based orientation measurements for local biasing fields |
Edward Nichols |
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