Computer Science – Learning
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.2947v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 7, pp.2947-2953
Computer Science
Learning
2
Scientific paper
We investigated the relationships among permeability ( k ), porosity ( ), and 1 HNMR (proton nuclear magnetic resonance) relaxation rate in sandstones with the objective of learning more about the connections between the chemical processes that influence 1 HNMR relaxation in a pore-filling aqueous solution and the permeability of the rock. We found that k is a well-correlated function of 1 HNMR relaxation time T 1 ( r 2 = 0.79, N = 113); the correlation between k and a bivariate function of T 1 and ( 4 T 1 2 ) is slightly better ( r 2 = 0.86). Furthermore, permeability is a robust function of T 1 or ( 4 T 1 2 ); neither relationship is significantly influenced by the range of porosity in the samples. In contrast, the relationship between permeability and porosity is degraded if low-porosity ( < 10%) rocks are excluded from the calibration. The common influence of the mineral-solution interface on both k and T 1 , mediated by the alteration of viscosity and motion of water molecules, is responsible for the observed functional relationships and the relative insensitivity of those relationships to . We expect that both T 1 and observed k can be modified by changes in solution composition that alter the mineral-solution interface. We do not expect much paramagnetic stimulation of relaxation (shortening of T 1 ) by Fe(III)-bearing solid phases in the pore, but more work is required to fully address this point.
Moses Carl O.
Vogeley John R.
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