Vertical fault leakage is a significant risk factor in petroleum exploration and has been suggested to be responsible for the underfilling of structural traps as well as for most of the exploration failures in the Hammerfest Basin. A previous investigation of 15 structures in this basin concluded that most of these structures leaked vertically (Hermanrud et al., 2014). The location where leakage took place was identified in most of these structures, as the hydrocarbon column tapers off to zero where the top reservoir surface meets the (presumed) leaky fault intersections or relay ramps. We here report a study where...