Methods and apparatus for constituent analysis of earth formations
US4394574A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1980 |
| Grant date | Jul 19, 1983 |
| Priority date | — |
| Expiry date | Sep 15, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The composition of a geological formation traversed by a borehole is investigated by measuring an energy spectrum of the radiation within the borehole. The measured spectrum is thereafter analyzed by comparing it with a composite spectrum, made up of standard spectra of constituents postulated to comprise the formation-borehole system. As a result of such analysis, the proportions of the postulated constituents in the formation are determined. Where the measured spectrum is subject to degradation due to changes in the resolution of the detector, a filtering arrangement effects modification of the standard spectra in a manner which provides for a more accurate determination of the constituents of the borehole-formation system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.