Spatial frequency method and apparatus for investigating earth conductivity with high vertical resolution by induction techniques
US4837517A · kind A · utility
108Cited by
43References
8Claims
0Family size
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Key dates
| Filing date | Jul 16, 1987 |
| Grant date | Jun 6, 1989 |
| Priority date | — |
| Expiry date | Jul 16, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electrical induction sonde for measuring a characteristic of an earth formation traversed by a borehole having improved vertical resolution and excellent depth of penetration. The sonde has two or more transmitter-receiver spacings preselected to provide at least two separate induction signals received from the formation that, when combined, produce a response function indicative of formation physical properties with no zeros in the spatial frequency response function over the frequency domain of interest.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.