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dc.contributor.authorKeller, Lukas-
dc.contributor.authorHolzer, Lorenz-
dc.contributor.authorWepf, Roger-
dc.contributor.authorGasser, Philippe-
dc.date.accessioned2018-01-25T11:07:24Z-
dc.date.available2018-01-25T11:07:24Z-
dc.date.issued2011-04-
dc.identifier.issn0169-1317de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/2199-
dc.description.abstractClay-rich sedimentary rocks are considered as seal lithologies for hosting radioactive waste or as caprocks for geological carbon sequestration sites. Evaluation of the rock's sealing capacity requires a comprehensive understanding of mass transport processes, which, in turn, demands knowledge of the 3D structure of pore space. Here, the use of focused ion beam nanotomography (FIB-nt) in building realistic pore space models is demonstrated along with a novel approach employed to analyze the topology of the pore space. The method was applied to three samples of the Opalinus clay of in northern Switzerland which is considered as a candidate host rock formation for the disposal of radioactive waste. Due to resolution limitations the lower limit of analyzed pore radii was about 10 nm. Pore radii > 10 nm were related to a physical porosity of about 2 vol.%. Comparing the pore size distribution determined by FIB-nt with the one obtained by N2 adsorption analysis, FIB-nt revealed the structure of about 20% of the total pore space. The total external porosity determined by N2 adsorption analysis was in the range of 10 to 12 vol.%. Our approach to analyze the complex 3D structure of the pore space was based on converting the voxel based 3D structure into a 3D graph of the pore skeleton. A 3D graph representation permitted determination of the spatial distribution of pore space geometrical properties such as pore path orientation, pore path tortuosity and pore path length. Pore-paths in Opalinus clay show a preferred orientation within the bedding plane in combination with a comparatively low pore path tortuosity. Pore path tortuosity perpendicular to the bedding plane is higher by a factor of as much as five. Anisotropy in pore space is caused by spatial density variations of pore path orientation (i.e. preferred orientations of pore paths) in combination with an elongated pore shape (i.e. low tortuosity).de_CH
dc.language.isoende_CH
dc.publisherElsevierde_CH
dc.relation.ispartofApplied Clay Sciencede_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectMapde_CH
dc.subject.ddc620.11: Werkstoffede_CH
dc.title3D geometry and topology of pore pathways in Opalinus clay : implications for mass transportde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
zhaw.organisationalunitInstitute of Computational Physics (ICP)de_CH
dc.identifier.doi10.1016/j.clay.2011.02.003de_CH
zhaw.funding.euNode_CH
zhaw.issue1-2de_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end95de_CH
zhaw.pages.start85de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume52de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
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Keller, L., Holzer, L., Wepf, R., & Gasser, P. (2011). 3D geometry and topology of pore pathways in Opalinus clay : implications for mass transport. Applied Clay Science, 52(1-2), 85–95. https://doi.org/10.1016/j.clay.2011.02.003
Keller, L. et al. (2011) ‘3D geometry and topology of pore pathways in Opalinus clay : implications for mass transport’, Applied Clay Science, 52(1-2), pp. 85–95. Available at: https://doi.org/10.1016/j.clay.2011.02.003.
L. Keller, L. Holzer, R. Wepf, and P. Gasser, “3D geometry and topology of pore pathways in Opalinus clay : implications for mass transport,” Applied Clay Science, vol. 52, no. 1-2, pp. 85–95, Apr. 2011, doi: 10.1016/j.clay.2011.02.003.
KELLER, Lukas, Lorenz HOLZER, Roger WEPF und Philippe GASSER, 2011. 3D geometry and topology of pore pathways in Opalinus clay : implications for mass transport. Applied Clay Science. April 2011. Bd. 52, Nr. 1-2, S. 85–95. DOI 10.1016/j.clay.2011.02.003
Keller, Lukas, Lorenz Holzer, Roger Wepf, and Philippe Gasser. 2011. “3D Geometry and Topology of Pore Pathways in Opalinus Clay : Implications for Mass Transport.” Applied Clay Science 52 (1-2): 85–95. https://doi.org/10.1016/j.clay.2011.02.003.
Keller, Lukas, et al. “3D Geometry and Topology of Pore Pathways in Opalinus Clay : Implications for Mass Transport.” Applied Clay Science, vol. 52, no. 1-2, Apr. 2011, pp. 85–95, https://doi.org/10.1016/j.clay.2011.02.003.


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