Folding and faulting should be regarded as only two of the several geologic processes that originate fracture porosity. Geologic evidence advanced by Currie and Nwachukwu supports the view that regional uplift and erosional unloading of strata also contribute to development of open fractures in the subsurface. In addition, studies by Magara demonstrated that regional paleo-overpressure could be a significant factor in the origin of fracture porosity. These regional processes may influence a fractured reservoir significantly, for example, by helping to maintain open fractures and, thereby, to enhance fracture permeability.

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