Morphology of the pore space in claystones - evidence from BIB/FIB ion beam sectioning and cryo-SEM observations

Details Morphology of the pore space in claystones - evidence from BIB/FIB ion beam sectioning and cryo-SEM observations Morphology of the pore space in claystones - evidence from BIB/FIB ion beam sectioning and cryo-SEM observations

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009earth...4...15d&link_type=abstract

eEarth, Volume 4, Issue 1, 2009, pp.15-22

Computer Science

2

Scientific paper

The morphology of pore space has a strong effect on mechanical and transport properties of mudrocks and clay-rich fault gouge, but its characterization has been mostly indirect. We report on a study of Boom clay from a proposed disposal site of radioactive waste (Mol site, Belgium) using high resolution SEM at cryogenic temperature, with ion beam cross-sectioning to prepare smooth, damage free surfaces. Pores commonly have crack-like tips, preferred orientation parallel to bedding and power law size distribution. We define a number of pore types depending on shape and location in the microstructure: large jagged pores in strain shadows of clastic grains, high aspect ratio pores between similarly oriented phyllosilicate grains and crescent-shaped pores in saddle reefs of folded phyllosilicates. 3-D reconstruction by serial cross-sectioning shows 3-D connectivity of the pore space. These findings offer a new insight into the morphology of pores down to nano-scale in comparison to traditional pore size distributions calculated from mercury Injection experiments, explain slaking of clays by successive wetting and drying and provide the basis for microstructure-based models of transport in clays.

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