Method for distinguishing between total formation permeability and fracture permeability
US4575828A · kind A · utility
15Cited by
11References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 9, 1984 |
| Grant date | Mar 11, 1986 |
| Priority date | — |
| Expiry date | Jul 9, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A borehole logging tool traverses a subsurface formation known to contain naturally occurring fractures. Acoustic wave energy through the naturally fractured formations is measured by a pair of spaced-apart receivers in the logging tool. The ratio of the tube wave amplitudes measured by the pair of receivers identifies total formation permeability. The differences in the tube wave travel times measured by the pair of receivers identifies matrix permeability. The difference between total formation permeability and matrix permeability is attributable to the naturally occurring fractures in the formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.