Input data to numerical analysis are derived from available field data (cores, logs and seismic data), established geomechanical and rock physics relationships and fault zone models. Uncertainties in models are addressed using sensitivity studies.
Fault analysis include:
- Fault stability during reservoir depletion and injection
- Fault reactivation
- Evaluation of fault sealing capacity
- Risk of leakage through overburden and sealing units
- Effects of faults on wells and infrastructure
- Fault formation and Development.
Example of fault study for the Statfjord Field, where fault integrity has been evaluated during late life depletion using Plaxis (Cuisiat, et.al 2010)
NGI has a world-leading laboratory with equipment for standard rock characterization as well as research facilities with specialized testing of fault mechanism and properties:
- Triaxial testing for basic characterization of faults and host rocks
- Ring Shear and Shear Box testing device for fault sealing and fracture characterization
- Triaxial tests inside CT scanner for visualisation of deformation and flow properties
- Microscopic characterization using thin section of tested samples.
Example of research project for fundamental understanding of fault initiation and development. Thin section showing clay smear from the NGI Ring Shear testing device (Cuisiat and Skurtveit 2010) and biaxial fault generation in sand (Rykkelid and Skurtveit 2008)