Modelling relaxation during pulse effects for the complex inversion of surface nmr data; Gaining insight into which rela

D. Grombacher, E. Auken

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingspeer-review

Abstract

A shortcoming of the standard surface nuclear magnetic resonance measurement, the free-induction decay, is that the meaning of the signal's time-dependence is uncertain. Ideally, the parameter describing the timedependence of the FID, called T2∗, carries a strong link to the geometry of the pore space. However, in the presence of background magnetic field inhomogeneity a second mechanism contributes to T-2∗potentially obscuring the link to pore geometry. To improve the understanding of which mechanism controls T-2∗, an approach involving direct modelling of relaxation during pulse effects is proposed. Numerical studies are presented to demonstrate that the complex inversion of surface NMR data provides the sensitivity to gain insight into the magnitude of T-2 from only FID measurements. Multiple inversions are performed for plausible T-2, given the observed magnitude of T2∗, and inversions providing satisfactory data fit can help constrain T2. Relaxation during pulse effects are also shown to be a contributing factor to difficulties describing the signal phase for complex inversions of surface NMR data.

Original languageEnglish
Title of host publication23rd European Meeting of Environmental and Engineering Geophysics
PublisherEuropean Association of Geoscientists and Engineers
ISBN (Electronic)9789462822238
DOIs
Publication statusPublished - 2017
Event23rd European Meeting of Environmental and Engineering Geophysics - Malmo, Sweden
Duration: 3 Sep 20177 Sep 2017

Publication series

Name23rd European Meeting of Environmental and Engineering Geophysics

Conference

Conference23rd European Meeting of Environmental and Engineering Geophysics
Country/TerritorySweden
CityMalmo
Period3/09/177/09/17

Programme Area

  • Programme Area 2: Water Resources

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