Logging earth formations with electromagnetic energy to determine conductivity and permittivity
US5345179A · kind A · utility
54Cited by
14References
31Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1992 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Mar 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A form of the disclosure is directed to determining properties of formations surrounding an earth borehole having a standoff layer. A method is disclosed for determining the conductivity and permittivity of the standoff layer and the conductivity and permittivity of the formations adjacent the standoff layer. A further form of the disclosure is directed to an electromagnetic logging apparatus having transmitting and receiving antennas in RTTR, RRTTRR or TTRRTT arrangements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.