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Determining pore sizes using an internal magnetic field

Song1

  • 1Schlumberger-Doll Research, Old Quarry Road, Ridgefield, Connecticut, 06877, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|March 24, 2000
PubMed
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This study introduces a novel method to measure pore sizes using internal magnetic fields in porous materials. The technique relies on magnetic field diffusion and is independent of surface relaxation effects.

Area of Science:

  • Geophysics
  • Materials Science
  • Physical Chemistry

Background:

  • Pore size characterization is crucial for understanding fluid flow and material properties.
  • Existing methods for pore size measurement can be limited by factors like surface relaxation.
  • Internal magnetic fields within porous media offer a potential new avenue for characterization.

Purpose of the Study:

  • To propose and validate a novel method for measuring pore size length scales.
  • To utilize the internal magnetic field (B(i)) and its spatial inhomogeneity for pore geometry determination.
  • To demonstrate independence from surface spin relaxation in pore size measurements.

Main Methods:

  • Developing a concept based on the internal magnetic field (B(i)) in porous materials.

Related Experiment Videos

  • Analyzing the spatial distribution of magnetic field inhomogeneity due to magnetic susceptibility contrast.
  • Investigating magnetization decay influenced by diffusion in B(i).
  • Observing the saturation of B(i) effects at long diffusion lengths.

    • Main Results:

    • The internal magnetic field's spatial distribution directly reflects pore geometry.
    • Diffusion in B(i) governs the initial magnetization decay.
    • Saturation of B(i) effects at long diffusion lengths correlates with characteristic pore size.
    • The method provides pore size measurements independent of surface spin relaxation.

    Conclusions:

    • The proposed method offers a robust way to determine pore size length scales.
    • This technique leverages magnetic field diffusion and inhomogeneity for accurate characterization.
    • Experimental validation using packed glass beads and sedimentary rocks supports the concept.