Analysis of nuclear data for determining characteristics of earth formations traversed by a borehole
US5086224A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1990 |
| Grant date | Feb 4, 1992 |
| Priority date | — |
| Expiry date | Nov 13, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for the determination of petrophysical characteristics of earth formation surrounding a borehole, comprising detecting gamma rays or neutrons representative of the formations and forming therefrom a set of detected data "U" which is then expressed as a function of the unknown characteristics "Y", and of a set of response data "S", representative of the conditions under which the detecting step is performed; and wherein "Y" is expressed as r=R Y, where "r" represents prior information independent from the detected data and obtained from other sources, and "R" indicates a set of relationships between at least part of the unknown characteristics. The detected data and response data are e.g. in the form of spectra, and the method may further include irradiating the formation with neutrons or gama rays.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.