Method for identifying hydrocarbon-zones in subsurface formations
US4972384A · kind A · utility
10Cited by
11References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 18, 1990 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Jan 18, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/284
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A compressional-to-shear wave velocity ratio is measured in a subsurface sandstone formation. Ratios of compressional-to-shear wave velocity are determined over a plurality of shear wave travel times in water-bearing sandstone and shale. The subsurface sandstone formation is identified as being hydrocarbon-bearing when the measured compressional-to-shear wave velocity ratio in the subsurface formation is less than an identified minimum of the compressional-to-shear wave velocity ratios determined for water-bearing sandstone and shale.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.