Shukla, M. N., Vallatos, A. , Phoenix, V. R. and Holmes, W. M. (2016) Accurate phase-shift velocimetry in rock. Journal of Magnetic Resonance, 267, pp. 43-53. (doi: 10.1016/j.jmr.2016.04.006) (PMID:27111139)
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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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Shukla, Dr Matsyendra Nath and Holmes, Dr William and Phoenix, Dr Vernon and Vallatos, Dr Antoine |
| Authors: | Shukla, M. N., Vallatos, A., Phoenix, V. R., and Holmes, W. M. |
| College/School: | College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience College of Science and Engineering > School of Geographical and Earth Sciences |
| Journal Name: | Journal of Magnetic Resonance |
| Publisher: | Elsevier |
| ISSN: | 1090-7807 |
| ISSN (Online): | 1096-0856 |
| Published Online: | 13 April 2016 |
| Copyright Holders: | Copyright © 2016 The Authors |
| First Published: | First published in Journal of Magnetic Resonance 267:43-53 |
| Publisher Policy: | Reproduced under a Creative Commons License |
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