Geological processes, such as glaciations, erosion, magmatic intrusions and salt diapirism, affects the stress situation in the Earth's crust. The stress changes may be large enough to cause reactivation of faults, formation of new fractures, and opening up of existing fractures. These are mechanisms that changes the permeability of the affected area, and may therefore induce remigration of hydrocarbons.
Solid rocks normally behaves elastic when subject to loads. If the load induces stress accumulations with magnitudes exceeding the strength of the rock, it fails, and fractures will form. We use linear elastic and poroelastic models to identify areas likely to fail, or faults likely to slip, when subject to a certain load.
The modelling is done by using the commercial software Comsol Multiphysics (www.comsol.com). Common topics for our stress modelling are: