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<jats:title>Abstract</jats:title><jats:p>It is well established that brine salinity can vary substantially in prospective CO<jats:sub>2</jats:sub> geo‐storage reservoirs. However, the impact of salinity on containment security has received only little attention. We thus used a compositional reservoir simulation to evaluate the effect of salinity on CO<jats:sub>2</jats:sub> plume migration and CO<jats:sub>2</jats:sub> trapping capacities in a 3D heterogeneous reservoir. The used heterogeneous reservoir consists of two formations: the bottom part of the reservoir is a fluvial reservoir, and the top part represents a near‐shore environment. Our results clearly indicate that salinity has a significant influence on CO<jats:sub>2</jats:sub> migration and the relative amount of mobile, residual, and dissolved CO<jats:sub>2</jats:sub>. Lower salinity decreases CO<jats:sub>2</jats:sub> mobility and migration distance, and enhances residual and solubility trapping significantly. We thus conclude that brine salinity is an important impact factor in the context of CO<jats:sub>2</jats:sub> geo‐storage, and that less saline reservoirs are preferable CO<jats:sub>2</jats:sub> sinks due to increased storage capacity and containment security. © 2017 Society of Chemical Industry and John Wiley &amp; Sons, Ltd.</jats:p>