Method of determining electrical anisotropy in a subsurface formation
US8482287B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 2008 |
| Grant date | Jul 9, 2013 |
| Priority date | — |
| Expiry date | Apr 14, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/083
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Method of determining electrical anisotropy in a subsurface formation, wherein electromagnetic field data from a multi-offset electromagnetic survey obtained by using an electromagnetic source and a plurality of electromagnetic receivers at varying offset distances from the source is provided. The electromagnetic field data comprises a first set of multi-offset response signals received at each receiver with the electromagnetic source emitting at a first frequency, and at least one additional set of multi-offset response signals received at each receiver with the electromagnetic source emitting at a different frequency. The presence of electrical anisotropy in the subsurface formation is determined using the first and at least one additional sets of multi-offset response signals. This may comprise comparing the first set and the at least one additional set of multi-offset response signals and determining the presence of electrical anisotropy in the subsurface formation from the comparison of the sets of multi-offset response signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.