  Carbon, capture, and storage (CCS) is an important bridging technology to
combat climate change in the transition towards net-zero. The FluidFlower
concept has been developed to visualize and study CO$_2$ flow and storage
mechanisms in sedimentary systems in a laboratory setting. Meter-scale
multiphase flow in two geological geometries, including normal faults with and
without smearing, is studied. The experimental protocols developed to provide
key input parameters for numerical simulations are detailed, including an
evaluation of operational parameters for the FluidFlower benchmark study.
Variability in CO$_2$ migration patterns for two different geometries is
quantified, both between 16 repeated laboratory runs and between
history-matched models and a CO$_2$ injection experiment. The predicative
capability of a history-matched model is then evaluated in a different
geological setting.
