期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 170, 期 -, 页码 83-94出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2012.11.029
关键词
Shales; Porosity; Microstructure; Imaging methods
类别
资金
- Swiss National Cooperative for the Disposal of Radioactive Waste (NAGRA), SHARC consortium
- Commonwealth Scientific and Industrial Research Organization (CSIRO)
- Curtin University of Technology
- NAGRA
STEM-, FIB- and x-ray tomography were applied to a sample taken from the Opalinus Clay unit. This allowed characterization of the pore structure in the fine-grained clay matrix at different levels of microstructural detail. On the level of detail that can be resolved by FIB-nt, the observed pore space is largely unconnected and the resolved porosity was in the 2-3 Vol.% range. At higher optical magnification but for smaller sample sizes, STEM tomography resolved a porosity of around 13 Vol.%. This suggests that the transition from an unconnected to a connected pore space in the shale sample occurs on the few nanometer scale. Geometric analyses of larger pores as visualized by FIB-nt revealed that dilation induced formation of bridges of only a few hundred nanometers between tips of neighboring pores may lead to a coalescence of larger pores. The resulting large pore network may allow for gas transport in the fine-grained clay matrix. (C) 2012 Elsevier Inc. All rights reserved.
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