Workreport 2009-80
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Name: |
Structural and Transport Properties of Illitized Samples from Drillhole OL-KR12 in Olkiluoto Porosity, Diffusion Coefficient, Permeability and Tomographic Imaging |
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Writer: |
Voutilainen, M., Myllys, M. & Timonen, J. |
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Language: |
English |
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Page count: |
20 |
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Summary: |
Six illitized samples from drillhole OL-KR12 in Olkiluoto were analyzed by helium gas methods for their diffusion coefficient, permeability and porosity. The diffusion coefficients measured varied in the range 2,1 * 10 -10 - 3,5 * 10 -8 m2/s, permeabilities in the range 6 * 10 -21 - 5,8 * 10 -16 m2, and porosities in the range 0,2 - 6,2 %. Variations observed in these quantities were concluded to arise from the heterogeneous structure of the sample rock. A 4 mm x 4 mm x 4 mm subsample was sawed from each of the six samples for structural analysis by x-ray microtomography. The three-dimensional structure of tomographic reconstructions, and thereby that of the samples themselves, was analyzed visually, which confirmed their heterogeneity. Samples represent altered rock whose structure and thereby transport properties vary significantly depending on the local alteration history of the rock. |
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Keywords: |
Porosity, diffusion coefficient, permeability, tomographic imaging, illitization |
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File: |
