There are 2 basic types of natural fractures that need to be studied when characterising naturally fractured reservoirs - whether it be a geothermal or hydrocarbon reservoir. These are extension and shear fractures.
Faults often have more than 1 slip surface. In this blog, we present a major fault with multiple surfaces which juxtaposes the Upper Devonian Sediments (at arbroath) against the Lower Devonian Sediments.