The effect of displacement distribution asymmetry on the accuracy of phase-shift velocimetry in porous media

Antoine Vallatos*, Matsyendra Nath Shukla, James M. Mullin, Vernon R. Phoenix, William M. Holmes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Phase-shift velocimetry provided by pulsed magnetic field gradient experiments is the fastest magnetic resonance technique for measuring velocity. However, critical issues have been reported when studying flow through porous media. These lead to inaccurate velocimetry results, with no clear explanation emerging. In this work we investigate the effect of asymmetries in the distribution of intra-voxel displacements on the accuracy of phase-shift velocimetry. This is particularly relevant to flow through porous media, where the presence of stagnant pores or differential flow is known to result in asymmetric displacement distributions. Here, tailored intra-voxel distributions are achieved using a simple phantom combined with a single large voxel. Combining experimental results with simulations, we demonstrate that the presence of asymmetries in the intra-voxel displacement distributions, common in studies of porous materials, can lead to important velocimetry errors.

Original languageEnglish
Pages (from-to)130-133
Number of pages4
JournalMicroporous and Mesoporous Materials
Volume269
Early online date2 Dec 2017
DOIs
Publication statusPublished - Oct 2018
Event13th International Bologna Conference of the Division-of-Groupement-Ampere on Magnetic Resonance in Porous Media (MRPM) - Bologna, Italy
Duration: 4 Sep 20168 Sep 2016

Keywords

  • PFG NMR
  • Phase-shift velocimetry
  • Propagator
  • Flow
  • Porous media
  • FLOW-VELOCITY
  • 2-PHASE FLOW
  • SANDSTONE
  • MRI
  • ROCK

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