%0 Conference Proceedings %F Poster %T Effects of aperture variability and wettability on immiscible displacement in fractures %+ Department of Earth Sciences [Uppsala] %+ Géosciences Rennes (GR) %+ Institute of Fluid Mechanics and Environmental Physics in Civil, Engineering %A Yang, Zhibing %A Méheust, Yves %A Neuweiler, Insa %< avec comité de lecture %B European Geosciences Union General Assembly 2017 %C Vienne, Austria %V 19 %P EGU2017-14828 %8 2017-04-23 %D 2017 %Z Sciences of the Universe [physics]/Earth Sciences/HydrologyConference poster %X Fluid-fluid displacement in porous and fractured media is an important process. Understanding and controllingthis process is key to many practical applications, such as hydrocarbon recovery, geological storage of CO2,groundwater remediation, etc. Here, we numerically study fluid-fluid displacement in rough-walled fractures. Wefocus on the combined effect of wettability and fracture surface topography on displacement patterns and interfacegrowth. We develop a novel numerical model to simulate dynamic fluid invasion under the influence of capillaryand viscous forces. The capillary force is calculated using the two principal curvatures (aperture-induced curvatureand in-plane curvature) at the fluid-fluid interface, and the viscous force is taken into account by solving the fluidpressure distribution. The aperture field of a fracture is represented by a spatially correlated random field, which isdescribed by a power spectrum for the fracture wall topography and a cutoff wave-length.We numerically producedisplacement patterns ranging from stable displacement, capillary fingering, and viscous fingering, as well as thetransitions between them. We show that both reducing the aperture variability and increasing the contact angle(from drainage to weak imbibition) stabilize the displacement due to the influence of the in-plane curvature, an effectanalogous to that of the cooperative pore filling in porous media. Implications of these results will be discussed. %G English %L insu-01510113 %U https://insu.hal.science/insu-01510113 %~ INSU %~ UNIV-RENNES1 %~ UR2-HB %~ CNRS %~ GR %~ OSUR %~ GIP-BE %~ UR1-HAL %~ UR1-SDLM %~ GR-DIMENV %~ UNIV-RENNES2 %~ TEST-UNIV-RENNES %~ TEST-UR-CSS %~ UNIV-RENNES %~ INRAE %~ UR1-ENV %~ GR-TERA %~ TEST3-HALCNRS %~ TEST4-HALCNRS %~ TEST5-HALCNRS