Method of determining downhole formation grain size distribution using acoustic and NMR logging data
US8195399B2 · kind B2 · utility
12Cited by
12References
20Claims
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Key dates
| Filing date | Mar 24, 2008 |
| Grant date | Jun 5, 2012 |
| Priority date | — |
| Expiry date | Jun 10, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The grain size distribution of a pore-scale geometric model of a clastic earth formation are adjusted so that the NMR relaxation time distribution output of the model matches a measured NMR distribution, and an acoustic velocity output of the model matches a measured acoustic velocity (compressional and/or shear). Fluid drainage and imbibing can be simulated. Additional properties of the earth formation are predicted using the pore-scale model. The additional properties may be based on additional measurements of properties of a fluid in the formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.