However, until recently, this technique was underused in geology because of its large acquisition time. The neutron imaging technique is ideal to explore fluid localization in porous materials due to the high but variable sensitivity of neutrons to the different hydrogen isotopes. These parameters can be constrained through tomography imaging of rock samples subjected to fluid injection under constrained flow rate and pressure. Two key parameters that control the variability of fluid flow and the movement of dissolved chemical species are (i) the local hydraulic conductivity, and (ii) the local sorption properties of the dissolved chemical species by the solid matrix. Understanding fluid flow in rocks is crucial to quantify many natural processes such as ground water flow and naturally triggered seismicity, as well as engineering questions such as displacement of contaminants, the eligibility of subsurface waste storage, geothermal energy usage, oil and gas recovery and artificially induced seismicity. 7University Grenoble Alpes, ISTER, University Savoie Mont Blanc, CNRS, IRD, IFFSTTAR, ISTerre, Grenoble, France.6Paul Scherrer Institute, ICON, Villigen, Switzerland.5University of Edinburgh, School of Geosciences, Edinburgh, United Kingdom.4Institute Laue-Langevin, Grenoble, France.Grenoble Alpes, CNRS, Grenoble INP, 3SR, Grenoble, France 2Department of Geoscience and Engineering, Faculty of Civil Engineering and Geosciences, TU Delft, Delft, Netherlands.1Departments of Geosciences and Physics, The Njord Centre, Physics of Geological Processes, University of Oslo, Oslo, Norway.Benoît Cordonnier 1 *, Anne Pluymakers 2, Alessandro Tengattini 3,4, Sina Marti 5, Anders Kaestner 6, Florian Fusseis 5 and François Renard 1,7
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