Veins are useful indicators of the sense of shear - here we look at some calcite veins in limestone in Oman which have a sigmoidal geometry in places and indicate a sinistral sense of shear.
Fractures, Geothermal
This blog addresses why wettability is important in the recovery of oil from fractured chalks.
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, Folds
This blog examines some key features of thrust systems with an example from seismic data offshore Namibia and from a hand specimen onshore UK.
Fractures, joints
This blog looks at joints contained within zones of deformation bands - how they form and if they are important or not.
