Method and apparatus for reservoir fluid characterization in nuclear magnetic resonance logging
US7298142B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2005 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Jul 14, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for obtaining a parameter of interest relating to a region proximate a nuclear magnetic resonance (NMR) logging tool suitable for subterranean well logging is disclosed. The nuclei of the region are subjected to a pulsed NMR technique and are productive of NMR logging data, the nuclei of the region characteristically having a longitudinal relaxation time T1 distribution and an apparent transverse relaxation time T2app distribution. In response to the NMR logging data, an R distribution is defined as R=T1/T2app, the T2app and R distributions are processed as separate bins, along with the NMR logging data, according to a two-dimensional inversion model, and a signal intensity map of R versus T2app is provided that is representative of the parameter of interest relating to the region. In response to a high-intensity signal on the map being within a first range of T2app values and a first range of R values, the presence of a light hydrocarbon within the region is identified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.