Impact of top-surface morphology on CO2 storage capacity

► We assess the validity of the assumption that geological detail will not influence simulation outcomes of CO2 storage capacity. ► We look at the effect of modeling top surface geometry in a CO2 storage site. ► Storage capacity is estimated by spill point analysis and flow simulation. ► For the fluid flow simulation method, we look at the effect of grid resolution. ► The morphology of top seal is of great importance for the storage capacity and migration patterns.