Induction logging and apparatus utilizing skew signal measurements in dipping beds
US4980643A · kind A · utility
62Cited by
4References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1989 |
| Grant date | Dec 25, 1990 |
| Priority date | — |
| Expiry date | Sep 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A second receiver coil system (45a,45b) at right angles to the primary receiver coil system (40) in an induction logging tool (10) detects the skewness in the logging tool field pattern caused by the presence of assymmetrical formation structures (30). This skew signal, which provides a composite measure of the asymmetry of the formation structures (30), can be used to correct for horns produced in formation conductivity logs when the logging tool sonde (14) traverses interfaces between dipping beds. The skew signal can also be used to determine the dip and strike angles between such dipping beds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.