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.
This blog outlines a simple method to predict fracture distribution from geomechanical principles including the common observation that thicker beds usually have less and more widely spaced fractures than thinner beds.
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.