Dr. Lukas Keller

Projects

• Characterisation of material changes during the sealing of water-exposed fractures in clay rock / Project leader / completed
• CAPACITIVE – XCT Data of Opalinus Clay Clay and microstructural investigations / Project leader / completed
• EURAD-WP-Gas: Mechanistic understanding of gas transport in clay materials / Project leader / completed

Publications

Articles in scientific journal, peer-reviewed

• Keller, L. M. et al. (2026) 'Swelling-induced fracture closure in Opalinus Clay : an inert particle tracking approach', Applied Clay Science, 284(108134). doi: 10.1016/j.clay.2026.108134.
• Keller, L. M. (2023) 'XCT analysis of drill cores of Opalinus clay and determination of sample size for effective properties evaluation', Frontiers in Earth Science, 11(1177408). doi: 10.3389/feart.2023.1177408.
• Liu, L. et al. (2022) 'In-situ shear modulus determination by pressuremeter tests in opalinus clay and reconciliation with laboratory tests', Rock Mechanics and Rock Engineering, 55(8), pp. 4615–4635. doi: 10.1007/s00603-022-02873-0.
• Keller, L. M. (2022) 'The hydromechanical behavior of opalinus clay fractures : combining roughness measurements with computer simulations', Frontiers in Earth Science, 10(945377). doi: 10.3389/feart.2022.945377.
• Keller, L. M. (2021) '3D pore microstructures and computer simulation : effective permeabilities and capillary pressure during drainage in Opalinus Clay', Oil & Gas Science and Technology – Revue d'IFP Energies nouvelles, 76(44). doi: 10.2516/ogst/2021027.
• Eidel, B. et al. (2019) 'Estimating the effective elasticity properties of a diamond/β-SiC composite thin film by 3D reconstruction and numerical homogenization', Diamond and Related Materials, 97. doi: 10.1016/j.diamond.2019.04.029.
• Keller, L. M. and Giger, S. B. (2019) 'Petrophysical properties of opalinus clay drill cores determined from Med-XCT images', Geotechnical and Geological Engineering, 37(4), pp. 3507–3522. doi: 10.1007/s10706-019-00815-2.
• Keller, L. and Holzer, L. (2018) 'Image-based upscaling of permeability in opalinus clay', Journal of Geophysical Research: Solid Earth, 123(1), pp. 285–295. doi: 10.1002/2017JB014717.
• Keller, L. M. et al. (2017) 'Understanding anisotropic mechanical properties of shales at different length scales : in situ micropillar compression combined with finite element calculations', Journal of Geophysical Research: Solid Earth, 122(8), pp. 5945–5955. doi: 10.1002/2017JB014240.
• Keller, L. M. (2016) 'Porosity anisotropy of Opalinus Clay : implications for the poroelastic behaviour', Geophysical Journal International, 208(3), pp. 1443–1448. doi: 10.1093/gji/ggw469.
• Marschall, P. et al. (2016) 'Microstructural insights into the petrophysical characteristics of indurated clays', CMS Workshop Lectures, 21, pp. 191–198. doi: 10.1346/CMS-WLS-21.14.
• Keller, L. M. (2016) 'Pore geometry effects on elastic properties of Opalinus Clay', Geophysics, 81(5), pp. D543–D551. doi: 10.1190/geo2015-0452.1.
• Keller, L. M., Hilger, A. and Manke, I. (2015) 'Impact of sand content on solute diffusion in Opalinus Clay', Applied Clay Science, 112-113, pp. 134–142. doi: 10.1016/j.clay.2015.04.009.
• Keller, L. M. et al. (2015) 'Intergranular pore space evolution in MX80 bentonite during a long-term experiment', Applied Clay Science, 104, pp. 150–159. doi: 10.1016/j.clay.2014.11.024.
• Keller, L. et al. (2014) 'The pore structure of compacted and partly saturated MX-80 bentonite at different dry densities', Clays and Clay Minerals, 62(3), pp. 174–187. doi: 10.1346/CCMN.2014.0620302.
• Keller, L. M. et al. (2014) 'On the potential of tomographic methods when applied to compacted crushed rock salt', Transport in Porous Media, 104(3), pp. 607–620. doi: 10.1007/s11242-014-0355-y.
• Holzer, L. et al. (2013) 'Redox cycling of Ni-YSZ anodes for solid oxide fuel cells: influence of tortuosity, constriction and percolation factors on the effective transport properties', Journal of Power Sources, 242, pp. 179–194. doi: 10.1016/j.jpowsour.2013.05.047.
• Wiedenmann, D. et al. (2013) 'Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms', AIChE Journal, 59(5), pp. 1446–1457. doi: 10.1002/aic.14094.
• Holzer, L. et al. (2013) 'The influence of constrictivity on the effective transport properties of porous layers in electrolysis and fuel cells', Journal of Materials Science, 48(7), pp. 2934–2952. doi: 10.1007/s10853-012-6968-z.
• Keller, L. M. et al. (2013) 'Pore space relevant for gas permeability in Opalinus clay : statistical analysis of homogeneity, percolation, and representative volume element', Journal of Geophysical Research: Solid Earth, 118(6), pp. 2799–2812. doi: 10.1002/jgrb.50228.
• Keller, L. M. et al. (2013) 'Characterization of multi-scale microstructural features in Opalinus Clay', Microporous and Mesoporous Materials, 170, pp. 83–94. doi: 10.1016/j.micromeso.2012.11.029.
• Keller, L. M. et al. (2011) 'On the application of focused ion beam nanotomography in characterizing the 3D pore space geometry of Opalinus clay', Physics and Chemistry of the Earth, Parts A/B/C, 36(17-18), pp. 1539–1544. doi: 10.1016/j.pce.2011.07.010.
• 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. doi: 10.1016/j.clay.2011.02.003.

Other publications

• Giger, S. B. et al. (2018) 'Consolidated-undrained triaxial testing of Opalinus Clay : results and method validation', Geomechanics for Energy and the Environment, 14, pp. 16–28. doi: 10.1016/j.gete.2018.01.003.
• Keller, L. (2015) 'On the representative elementary volumes of clay rocks at the mesoscale', Journal of Geology and Mining Research, 7(6), pp. 58–64. doi: 10.5897/JGMR2015.0224.

go back