Method and apparatus for determining dielectric permittivity of subsurface formations
US4652828A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 1984 |
| Grant date | Mar 24, 1987 |
| Priority date | — |
| Expiry date | Apr 13, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/38
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Well logging techniques are set forth for obtaining improved measurements of formation dielectric permittivity, conductivity, and water-filled porosity. The effects of dielectric and conductivity frequency dispersion are considered and utilized. In a disclosed embodiment, a corrected dielectric permittivity of a formation surrounding a borehole is determined using the following steps: deriving a measured value of formation dielectric permittivity from a logging device which traversed the borehole; deriving a measured value of formation conductivity from a logging device which traversed the borehole; determining a formation dielectric permittivity dispersion value as a function of the measured conductivity; and determining a corrected formation dielectric permittivity from the measured value of dielectric permittivity and the dispersion value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.