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.
These conjugate normal faults are found in the Permo-Trias Hopeman Sandstone, Inner Moray Firth, UK. Here we look at these within the context of Anderson’s model and what it means when for example interpreting seismic data.