Journal
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS
Volume 339, Issue 1-2, Pages 159-165Publisher
ELSEVIER
DOI: 10.1016/j.physa.2004.03.033
Keywords
porous media; X-ray-CT; NMR; relaxation; restricted diffusion
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High resolution micro-X-ray-CT data is used as a gold standard to define the morphology of a number of sandstones as well as a carbonate rock. From these micro-CT images the NMR responses to surface relaxation and restricted diffusion in the internal magnetic field are calculated numerically. The NMR response is decomposed into a distribution of relaxation times by an inverse Laplace transformation. By interpreting the relaxation time distributions in terms of relaxation and diffusion modes pore size distributions are derived from the NMR responses. The pore size distributions obtained from an interpretation of the NMR data are compared with corresponding measures derived directly from the X-ray-CT images. (C) 2004 Elsevier B.V. All rights reserved.
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