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NMR responses to kaolinite in sand
T Grøns1, H Rueslåtten, E Roaldset
1Norwegian University of Science and Technology, Trondheim, Norway.
Magnetic Resonance Imaging
|January 1, 1996
Summary
Adding kaolinite to quartz sand increases the NMR relaxation rate, especially when kaolinite covers quartz surfaces. This indicates kaolinite enhances surface area and relaxation strength, impacting proton NMR behavior in porous media.
Area of Science:
- Geochemistry
- Materials Science
- Geophysics
Background:
- Proton nuclear magnetic resonance (NMR) is a powerful tool for characterizing porous media.
- Understanding the influence of mineral composition on NMR relaxation is crucial for interpreting subsurface data.
Purpose of the Study:
- To investigate the effect of kaolinite addition on the proton NMR longitudinal (T1) relaxation time of quartz sand.
- To determine how kaolinite surface coverage impacts NMR relaxation rates.
Main Methods:
- Petrophysical and petrographic characterization of four quartz sand size fractions.
- Proton NMR measurements of longitudinal (T1) relaxation time.
- Systematic addition of kaolinite to quartz sand samples.
Main Results:
- An increase in NMR relaxation rate was observed with increasing kaolinite content.
- The NMR relaxation rate continuously increased up to a 'break point' corresponding to full kaolinite surface coverage.
- Kaolinite addition significantly alters the surface properties of quartz sand.
Conclusions:
- Kaolinite significantly influences the NMR relaxation behavior of quartz sand.
- The observed increase in relaxation rate is attributed to increased surface area and higher surface relaxation strength of kaolinite.
- This study provides insights into the role of clay minerals in modifying NMR signals in geological formations.