Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1997-12-19
2000-05-30
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
G01V 300
Patent
active
060694777
ABSTRACT:
The total porosity of a subterranean formation is calculated by summing the effective Porosity and the clay bound water (CBW) porosity. With the invention described in this patent, the distortion effects of clay bound water (CBW) porosity on the measurement of total porosity is filtered out. The effects will be more significant in slialy sand where the CBW porosity component of total porosity is abundant. The correct NMR transverse relaxation time (T.sub.2) spectra distribution is essential to a determination of capillary bound fluid (BVI) partial porosity and the Spectral Bulk Volume Irreducible (SBVI) model. The same data correction concept can be applied to make a meaningful comparison of well logs or laboratory core NMR data that are obtained with different interecho time (TE) sampling periods.
REFERENCES:
patent: 5212447 (1993-05-01), Paltiel
patent: 5557200 (1996-09-01), Coates
patent: 5936405 (1999-08-01), Prammer et al.
Chen S., and Georgi T.R., "Improving the accuracy of NMR Relaxation Distribution analysis in Clay-Rich Reservoirs and Core Samples".International Symposium-Society of Core Analysts SCA-9702 pp. 1-10 See figures 4 and 6, Sep. 1997.
Chen Songhua
Georgi Daniel T.
Fetzner Tiffany A.
Oda Christine K.
Springs Darryl M.
Tripp Karen B.
Western Atlas International Inc.
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