Accurate phase-shift velocimetry in rock

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Spatially resolved Pulsed Field Gradient (PFG) velocimetry techniques can provide precious information concerning flow through opaque systems, including rocks. This velocimetry data is used to enhance flow models in a wide range of systems, from oil behaviour in reservoir rocks to contaminant transport in aquifers. Phase-shift velocimetry is the fastest way to produce velocity maps but critical issues have been reported when studying flow through rocks and porous media, leading to inaccurate results. Combining PFG measurements for flow through Bentheimer sandstone with simulations, we demonstrate that asymmetries in the molecular displacement distributions within each voxel are the main source of phase-shift velocimetry errors. We show that when flow-related average molecular displacements are negligible compared to self-diffusion ones, symmetric displacement distributions can be obtained while phase measurement noise is minimised. We elaborate a complete method for the production of accurate phase-shift velocimetry maps in rocks and low porosity media and demonstrate its validity for a range of flow rates. This development of accurate phase-shift velocimetry now enables more rapid and accurate velocity analysis, potentially helping to inform both industrial applications and theoretical models.

LanguageEnglish
Pages43-53
Number of pages11
JournalJournal of Magnetic Resonance
Volume267
Early online date13 Apr 2016
DOIs
Publication statusPublished - 30 Jun 2016
Externally publishedYes

Fingerprint

Rheology
Phase shift
Velocity measurement
phase shift
Rocks
rocks
information flow
gradients
aquifers
sandstones
noise measurement
contaminants
Phase measurement
flow velocity
oils
Porosity
Groundwater
asymmetry
Sandstone
porosity

Keywords

  • Bentheimer
  • flow
  • MRI
  • PFG NMR
  • porous media
  • rock
  • sandstone
  • velocimetry
  • velocity

Cite this

Shukla, Matsyendra Nath ; Vallatos, Antoine ; Phoenix, Vernon R. ; Holmes, William M. / Accurate phase-shift velocimetry in rock. In: Journal of Magnetic Resonance. 2016 ; Vol. 267. pp. 43-53.
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Accurate phase-shift velocimetry in rock. / Shukla, Matsyendra Nath; Vallatos, Antoine; Phoenix, Vernon R.; Holmes, William M.

In: Journal of Magnetic Resonance, Vol. 267, 30.06.2016, p. 43-53.

Research output: Contribution to journalArticle

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