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.
Deformation bands are fault-like structures that reduce the reservoir quality of otherwise good quality sandstones. Here we look at their impact upon effective permeability, which has implications during reservoir development.
Deformation Bands are fault like structures that drastically reduce the porosity and permeability of sandstones.
Here we focus upon cataclastic (grain size reduction) deformation bands, their impact upon hydrocarbon production and exploration and some ways to predict them.