Dr. Lukas Keller

Projects

• CAPACITIVE – XCT Data of Opalinus Clay Clay and microstructural investigations / Project leader / Project ongoing
• EURAD-WP-Gas: Mechanistic understanding of gas transport in clay materials / Project leader / Project completed

Publications

• Keller, Lukas 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).

  Available from: https://doi.org/10.3389/feart.2023.1177408

• Liu, Lang; Giger, Silvio; Martin, Derek; Chalaturnyk, Rick; Schuster, Kristof; Deisman, Nathan; Keller, Lukas,

  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.

  Available from: https://doi.org/10.1007/s00603-022-02873-0

• Keller, Lukas M.,

  2022.

  The hydromechanical behavior of opalinus clay fractures : combining roughness measurements with computer simulations.

  Frontiers in Earth Science.

  10(945377).

  Available from: https://doi.org/10.3389/feart.2022.945377

• Keller, Lukas 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).

  Available from: https://doi.org/10.2516/ogst/2021027

• Eidel, Bernhard; Gote, Ajinkya; Ruby, Marius; Holzer, Lorenz; Keller, Lukas; Jiang, Xin,

  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.

  Available from: https://doi.org/10.1016/j.diamond.2019.04.029

• Keller, Lukas M.; Giger, Silvio B.,

  2019.

  Petrophysical properties of opalinus clay drill cores determined from Med-XCT images.

  Geotechnical and Geological Engineering.

  37(4), pp. 3507-3522.

  Available from: https://doi.org/10.1007/s10706-019-00815-2

• Keller, Lukas; Holzer, Lorenz,

  2018.

  Image-based upscaling of permeability in opalinus clay.

  Journal of Geophysical Research: Solid Earth.

  123(1), pp. 285-295.

  Available from: https://doi.org/10.1002/2017JB014717

• Keller, Lukas M.; Schwiedrzik, Jakob J.; Gasser, Philippe; Michler, Johann,

  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.

  Available from: https://doi.org/10.1002/2017JB014240

• Marschall, P.; Keller, Lukas; Giger, S. B.; Becker, J.,

  2016.

  Microstructural insights into the petrophysical characteristics of indurated clays.

  CMS Workshop Lectures.

  21, pp. 191-198.

  Available from: https://doi.org/10.1346/CMS-WLS-21.14

• Keller, Lukas M.,

  2016.

  Pore geometry effects on elastic properties of Opalinus Clay.

  Geophysics.

  81(5), pp. D543-D551.

  Available from: https://doi.org/10.1190/geo2015-0452.1

• Keller, Lukas M.,

  2016.

  Porosity anisotropy of Opalinus Clay : implications for the poroelastic behaviour.

  Geophysical Journal International.

  208(3), pp. 1443-1448.

  Available from: https://doi.org/10.1093/gji/ggw469

• Keller, Lukas M.; Hilger, André; Manke, Ingo,

  2015.

  Impact of sand content on solute diffusion in Opalinus Clay.

  Applied Clay Science.

  112-113, pp. 134-142.

  Available from: https://doi.org/10.1016/j.clay.2015.04.009

• Keller, Lukas M.; Holzer, Lorenz; Gasser, Philippe; Erni, Rolf; Rossell, Marta D.,

  2015.

  Intergranular pore space evolution in MX80 bentonite during a long-term experiment.

  Applied Clay Science.

  104, pp. 150-159.

  Available from: https://doi.org/10.1016/j.clay.2014.11.024

• Keller, Lukas M.; Jobmann, Michael; Schuetz, Philipp; Gasser, Philippe,

  2014.

  On the potential of tomographic methods when applied to compacted crushed rock salt.

  Transport in Porous Media.

  104(3), pp. 607-620.

  Available from: https://doi.org/10.1007/s11242-014-0355-y

• Keller, Lukas; Seiphoori, Ali; Gasser, Philippe; Lucas, Falk; Holzer, Lorenz; Ferrari, Alessio,

  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.

  Available from: https://doi.org/10.1346/CCMN.2014.0620302

• Keller, Lukas M.; Holzer, Lorenz; Schuetz, Philipp; Gasser, Philippe,

  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.

  Available from: https://doi.org/10.1002/jgrb.50228

• Keller, Lukas M.; Schuetz, Philippe; Erni, Rolf; Rossell, Marta D.; Lucas, Falk; Gasser, Philippe; Holzer, Lorenz,

  2013.

  Characterization of multi-scale microstructural features in Opalinus Clay.

  Microporous and Mesoporous Materials.

  170, pp. 83-94.

  Available from: https://doi.org/10.1016/j.micromeso.2012.11.029

• Holzer, Lorenz; Iwanschitz, Boris; Hocker, Thomas; Keller, Lukas; Pecho, Omar; Sartoris, Guido; Gasser, Philippe; Muench, Beat,

  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.

  Available from: https://doi.org/10.1016/j.jpowsour.2013.05.047

• Holzer, Lorenz; Wiedenmann, Daniel; Münch, Beat; Keller, Lukas; Prestat, Michel; Gasser, Philippe; Robertson, Iain; Grobéty, Bernard,

  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.

  Available from: https://doi.org/10.1007/s10853-012-6968-z

• Wiedenmann, Daniel; Keller, Lukas; Holzer, Lorenz; Stojadinović, Jelena; Münch, Beat; Suarez, Laura; Fumey, Benjamin; Hagendorfer, Harald; Brönnimann, Rolf; Modregger, Peter; Gorbar, Michal; Vogt, Ulrich F.; Züttel, Andreas; La Mantia, Fabio; Wepf, Roger; Grobéty, Bernard,

  2013.

  Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms.

  AIChE Journal.

  59(5), pp. 1446-1457.

  Available from: https://doi.org/10.1002/aic.14094

• Keller, Lukas; Holzer, Lorenz; Wepf, Roger; Gasser, Philippe,

  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 from: https://doi.org/10.1016/j.clay.2011.02.003

• Keller, Lukas M.; Holzer, Lorenz; Wepf, Roger; Gasser, Philippe; Münch, Beat; Marschall, Paul,

  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.

  Available from: https://doi.org/10.1016/j.pce.2011.07.010

• Giger, Silvio B.; Ewy, Russell T.; Favero, Valentina; Stankovic, Rudy; Keller, Lukas M.,

  2018.

  Consolidated-undrained triaxial testing of Opalinus Clay : results and method validation.

  Geomechanics for Energy and the Environment.

  14, pp. 16-28.

  Available from: https://doi.org/10.1016/j.gete.2018.01.003

• Keller, Lukas,

  2015.

  On the representative elementary volumes of clay rocks at the mesoscale.

  Journal of Geology and Mining Research.

  7(6), pp. 58-64.

  Available from: https://doi.org/10.5897/JGMR2015.0224

Publications before appointment at the ZHAW

L. M. Keller & M. K. D. Stipp (2011). Crystal preferred orientations of sheared quartz aggregates: a new
comparison between nature and numerical simulations. Journal of structural geology, 33, 1491-1500.

L. M. Keller, L. Holzer, R. Wepf & P. Gasser (2011). 3D geometry and topology of pore pathways in Opalinus clay: Implications for mass transport. Applied Clay Sciences, 52, 85-95.

L. M. Keller, L. C. Götze, E. Rybacki & R. Abart (2010). Enhancement of solid-state reaction rates by non-
hydrostatic stress effects on polycrystalline diffusion kinetics. American Mineralogist, 95, 1399-1407.

L. C. Götze, R. Abart, E. Rybacki, L. M. Keller, E. Petrishcheva & G. Dresen (2010). Reaction rim growth in the
System MgO - Al2O3 - SiO2 under uniaxial stress. Mineralogy and Petrology, 99, 263-277.

J. Prenzle, R. Abart & L. M. Keller (2009). Complex chemical zoning in eclogite facies garnet reaction rims: the
role of grain boundary diffusion. Mineralogy and Petrology, 95, 303-313.

L. M. Keller, B. Wunder, D. Rhede & R. Wirth (2008). Component mobility at 900°C and 18 kbar from
experimentally grown coronas in a natural gabbro. Geochimica Cosmochmica Acta, 72, 4307-4322.

L. M. Keller, R. Wirth, D. Rhede, K. Kunze & R. Abart (2008). Asymetrically zoned reaction rims: assessment of
grain boundary diffusivities and growth rates related to natural diffusion controlled mineral reactions.
Journal of Metamorphic Geology, 26, 99-120.

L. M. Keller, C. A. Hauzenberger & R. Abart (2007). Interphase boundary diffusion rates and their effect on
retrograde zoning patterns of metamorphic minerals. Contributions to Mineralogy and Petrology, 154, 205-216.

L. M. Keller, R. Abart, R. Wirth, D. Schmid & K. Kunze (2006). Enhanced mass transfer through short circuit
diffusion: growth of garnet reaction rims at eclogite facies conditions. American Mineralogist, 91, 1024-1038.

L. M. Keller, B. Fügenschuh, M. Hess, B. Schneider & S. M. Schmid (2006). The Simplon fault zone in the
Western Alps: The mechanism of neogene faulting and folding revisited. Geology, 34, 317-320.

L. M. Keller, R. Abart & C. De Capitani (2005). Phase relations and chemical composition of phengite and
paragonite in pelitic schists during decompression: A case study from Monte Rosa nappe and Camughera – Moncuccounit, Western Alps. Journal of Petrology, 46, 2145-2166.

L. M. Keller, C. De Capitani & R. Abart (2005). A quaternary solution model for white micas based on natural
coexisting phengite-paragonite pairs. Journal of Petrology, 46, 2129-2144.

L. M. Keller, M. Hess, B. Fügenschuh & S. M. Schmid (2005). Structural and metamorphic evolution of the
Camughera-Mocucco and the Monte Rosa units southwest of the Simplon line. Eclogae geol. Helv.
(Swiss journal of Geosciences), 98, 19-49.

L. M. Keller, R. Abart, H. Stünitz & C. De Capitani (2004). Deformation, mass transfer and mineral reactions in an eclogite facies shear zone in a polymetamorphic metapelite (Monte Rosa nappe, western Alps).
Journal of Metamorphic Geology, 22, 97-118.

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