Modeling of geological facies is a vital task in the reservoir modeling process. Object-based facies models have a long and proven history of being able to represent geological information in a robust and consistent manner. Expert knowledge on depositional processes and their natural variability can be incorporated by geometrical descriptions of the different facies. This is particularly important for hydrocarbon flow and communication within the reservoir, and are commonly a major source of uncertainty.

Fault seal parameters are used to model the fluid flow through faults. This is done by calculating a fault seal parameter based on the lithologies next to the fault. This fault seal parameter is then used to model fault zone permeability and fault transmissibility multipliers which are used in the flow simulation.

The Havana software has supported modeling of fault zone permeability both for seismic and subseismic faults since the 1990's.