Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aps..cntic0606m&link_type=abstract
American Physical Society, Centennial Meeting, March 20-26, 1999, Atlanta, GA, Bulletin of the American Physical Society, Vol.
Physics
Scientific paper
We probe the structure of porous media using NMR measurements of the time-dependent diffusion of xenon gas imbibed into the pore space. The primary advantages of gas-phase NMR, relative to previous measurements using water, are: (i) gas diffusion coefficients are orders of magnitude larger than those of liquids; and (ii) noble gases interact much less strongly with surfaces than do most liquid molecules. Therefore, this new method greatly extends the length scales in porous media that can be studied with NMR diffusion measurements, from ~ 50 microns with water, up to ~ 1 cm with gases. In random packs of glass beads, using both laser- and thermally-polarized xenon, we find that gas diffusion NMR can accurately measure the pore space surface-area-to-volume-ratio and tortuosity (the latter quantity being related to the pore's long distance connectivity and fluid permeability). In addition, xenon gas diffusion NMR has allowed us to determine the tortuosity of reservoir rocks, a measurement that is beyond the scope of existing liquid NMR techniques.
Hoffmann Daniel
Hurlimann Martin D.
Mair Ross W.
Patz Samuel
Schwartz Lawrence M.
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