Method for determining low frequency conductivity of subsurface formations
US4780679A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1987 |
| Grant date | Oct 25, 1988 |
| Priority date | — |
| Expiry date | Feb 2, 2007 |
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, an estimated low frequency conductivity of a formation surrounding a borehole is determined using the following steps: deriving a measured value of formation high frequency conductivity from a logging device which traversed the borehole; determining a formation conductivity dispersion ratio as a function of the measured conductivity; and determining an estimated low frequency conductivity from the measured value of high frequency conductivity and the dispersion ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.