iTOUGH2 Parameters

Parameters Estimated by iTOUGH2

In general, any input parameter for the TOUGH2 simulator can be estimated using iTOUGH2, provided that data of sufficient sensitivity are available. The parameters include hydrogeologic and thermal properties, initial and boundary conditions, some geometric features, as well as shifts or lags in the data. A list of parameters currently implemented in iTOUGH2 is shown below. Furthermore, an interface routine is provided in which users can specify their own parameter types.

Most of the parameters refer to one or more rock types defined in TOUGH2, but they may also be associated with grid blocks, sink/sources, parameters of the meshmaker utility, or default properties. One can estimate individual parameters or groups of parameters of the same type. iTOUGH2 estimates either the value of a parameters, its logarithm or a scaling factor. Prior information about the parameter can be provided, along with lower and upper bounds.

The following is a list of available parameter types:

Anisotropic absolute permeabilities
Any parameter of the relative permeability functions
Any parameter of the capillary pressure function
Initial conditions
- Initial pressure
- Initial saturation
- Initial temperature
- Initial mass fraction
Boundary conditions
- Boundary pressure
- Boundary saturation
- Boundary temperature
- Boundary mass fraction
- Time-dependent or constant sinks and sources
Porosity
Rock compressibility
Heat capacity
Thermal conductivity
Klinkenberg factor
Distribution of pumping rates within a well cluster
Fracture aperture assuming parallel plate model
Productivity index for wells on deliverability
Bottomhole pressure for wells on deliverability
Fracture spacing for MINC meshes
Lag in the data
Drift in the data
Parameters of the SELEC block
IFS parameters
Grid scaling factor
User-specified parameters

Page updated: December 21, 1998