Related Experiment Videos
Angstrom-to-millimeter characterization of sedimentary rock microstructure
A P Radlinski1, M A Ioannidis, A L Hinde
1Geoscience Australia, GPO Box 378, Canberra City, Australian Capital Territory 2601, Australia. andrezej.radlinski@ga.gov.au
Journal of Colloid and Interface Science
|May 18, 2004
Summary
This study combines backscatter SEM and small-angle neutron scattering to analyze pore size distribution in porous solids. The novel method reveals fractal rock microstructures, aiding the study of reservoir rocks.
Area of Science:
- Materials Science
- Geophysics
- Physics
Background:
- Understanding porous solid microstructure is crucial for applications like hydrocarbon reservoir exploration.
- Characterizing pore size distribution across multiple length scales presents a significant challenge.
Purpose of the Study:
- To develop and demonstrate a combined statistical framework using backscatter SEM and SANS for quantifying continuous pore-size distributions.
- To analyze the microstructure of natural sandstone and validate the method against established techniques.
Main Methods:
- Integration of backscatter Scanning Electron Microscopy (BSEM) and small-angle neutron scattering (SANS) data.
- Statistical analysis to determine pore-size distribution from 10 Å to 500 µm.
- Validation using mercury porosimetry (MP) and nuclear magnetic resonance (NMR) relaxation data.
Main Results:
- The rock microstructure exhibits fractal characteristics (D=2.47) for pore sizes between 10 Å and 50 µm, transitioning to Euclidean at larger scales.
- The determined pore-size distribution aligns with mercury porosimetry findings.
- NMR relaxation data revealed a bimodal proton T(2) distribution, quantitatively explained by a fractal pore relaxation model.
Conclusions:
- The combined SANS/BSEM method provides a robust approach for microstructural characterization of porous solids.
- This technique offers valuable insights into capillary phenomena in reservoir rocks and other complex porous materials.
- The study confirms the fractal nature of sandstone microstructure within specific pore-size ranges.