An unconformity trap is a hydrocarbon trap where the closure is made by an unconformity (= a formation of rock layers which represents a gap in the geological record).
An unconformity trap can form if part of a porous layer of rock is eroded and then covered with an impermeablecaprock.
Unconformity traps are traps which result from alternating periods of sedimentation and erosion.
An unconformity trap is a hydrocarbon trap where the closure is made by an unconformity.