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Determining NMR flow propagator moments in porous rocks without the influence of relaxation by J. Mitchell; D.A. Graf von der Schulenburg; D.J. Holland; E.J. Fordham; M.L. Johns; L.F. Gladden is a Chemistry article available to read on EtoBox.

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Flow propagators, used for the study of advective motion of brine solution in porous carbonate and sandstone rocks, have been obtained without the influence of Nuclear Magnetic Resonance (NMR) relaxation times, T 1 and T 2 . These spin relaxation mechanisms normally result in a loss of signal that varies depending on the displacement f of the flowing spins, thereby preventing the acquisition of quantitative propagator data. The full relaxation behaviour of the system under flow needs to be characterised to enable the implementation of a true quantitative measurement. Two-dimensional NMR correlations of f À T 2 and T 1 À T 2 are used in combination to provide the flow propagators without relaxation weighting. T 1 À f correlations cannot be used due to the loss of T 1 information during the displacement observation time D. Here the moments of the propagators are extracted by statistical analysis of the full propagator shape. The measured displacements (first moments) are seen to correlate with the expected mean displacements for long observation times D. The higher order moments of the propagators determined by this method indicate those obtained previously using a correction were ov

Who reads Determining NMR flow propagator moments in porous rocks without the influence of relaxation?

Author

J. Mitchell; D.A. Graf von der Schulenburg; D.J. Holland; E.J. Fordham; M.L. Johns; L.F. Gladden

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 1090-7807)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)