System and method for enhanced vertical resolution magnetic resonance imaging logs
US6337568B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Apr 7, 2000 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Apr 7, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/4625
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An interpretation method and system for NMR echo-train data in thinly laminated sequences. The invention uses geological information obtained at higher vertical resolution, such as using Electric Micro Imaging, to enhance the vertical resolution of echo-train data, and thus avoids log interpretations in which the hydrocarbon potential of the formation can be misread because low resolution logs tend to provide an average description of the formation. Such averaging is especially problematic in thinly laminated sequences that consist of highly permeable and porous sand layers and less permeable silt or essentially impermeable shale layers. In a preferred embodiment, using the additional high-resolution formation information one can estimate the typical T2-spectra of lithological laminae, and significantly enhance the permeability estimate in the laminated sequences. In another aspect the system and method of the preferred embodiment use neural network(s) to further enhance the resolution of a particular log measurement. The method and system are applicable to any temporal data from other logging tools, such as the thermal neutron decay log and others. The system and method enable pro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.