Modeling of super-dispersion in unsaturated porous media using NMR propagators

[Display omitted] •We present an overview of a new model to interpret dispersion in porous media.•The model can reproduce various shapes of NMR propagators (asymmetric, bimodal).•The model predict the PFG-NMR signal directly.•Model fitting is performed using the PFG-NMR signal instead of the propaga...

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Bibliographic Details
Published in:Microporous and mesoporous materials 2015-03, Vol.205, p.75-78
Main Authors: Fleury, M., Bauer, D., Néel, M.C.
Format: Article
Language:English
Subjects:
Computer Science
Dispersion
Engineering Sciences
Modeling and Simulation
Other
PFG-NMR
Porous media
Propagator
Two phase flow
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Summary:[Display omitted] •We present an overview of a new model to interpret dispersion in porous media.•The model can reproduce various shapes of NMR propagators (asymmetric, bimodal).•The model predict the PFG-NMR signal directly.•Model fitting is performed using the PFG-NMR signal instead of the propagator. We present a general model (SMIM) specifically designed for the interpretation of NMR velocimetry data. Extending the well-known concept of Mobile/Immobile tracer particles applied in dispersion theory, we reproduce two mechanisms responsible for non-Gaussian behavior: immobile molecules trapped in non-flowing zones, and unexpectedly long but rare displacements. From the derived analytical expressions of the NMR signals fitted to the recorded data, we can determine a generalized dispersion coefficient in the case of super dispersion. Using NMR velocimetry data collected in a homogeneous 30μm grain pack and 10
ISSN:1387-1811
1873-3093
DOI:10.1016/j.micromeso.2014.07.035