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Related Experiment Videos

Pore geometry information via pulsed field gradient NMR

A J Lucas1, S J Gibbs, M Peyron

  • 1Herchel Smith Laboratory for Medicinal Chemistry, University of Cambridge School of Clinical Medicine, UK.

Magnetic Resonance Imaging
|January 1, 1994
PubMed
Summary

This study examines echo attenuation in pulsed field gradient nuclear magnetic resonance (NMR) experiments on rock cores. Findings help validate theories on how pore structure and surface relaxation affect NMR signals in real rock systems.

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Area of Science:

  • Geophysics
  • Materials Science
  • Nuclear Magnetic Resonance Spectroscopy

Background:

  • Pulsed field gradient nuclear magnetic resonance (PFG-NMR) is sensitive to pore structure.
  • Echo attenuation in PFG-NMR is influenced by pore geometry and surface relaxation effects.
  • Understanding these effects is crucial for interpreting NMR data from porous media.

Purpose of the Study:

  • To test the applicability of recent theoretical analysis of echo attenuation to real rock core samples.
  • To investigate the relationship between pore geometry, surface relaxation, and NMR signal decay.
  • To advance the interpretation of PFG-NMR data in geological contexts.

Main Methods:

  • Performed pulsed field gradient NMR experiments.
  • Measured echo attenuation at various long diffusion times.

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  • Utilized a variety of rock core samples with diverse pore characteristics.

    • Main Results:

    • Observed echo attenuation patterns consistent with theoretical predictions.
    • Demonstrated the significant impact of pore geometry on signal decay.
    • Highlighted the role of surface relaxation in short- and long-time diffusion regimes.

    Conclusions:

    • The theoretical framework for echo attenuation is applicable to real rock systems.
    • PFG-NMR, combined with advanced analysis, provides valuable insights into rock pore structure.
    • This research validates theoretical models and enhances NMR's utility in characterizing porous geological materials.