Input parameters for the

Each observation refers to one or more grid blocks, connections or sink/source term in the **TOUGH2** model.
Time-dependent or steady-state data can be provided as lists in an arbitrary format.
Measurement uncertainties can be specified for each data set or individually for each data point.

The following is a list of available observation types:

- Pressure
- Gas pressure
- Liquid pressure
- NAPL pressure
- Capillary pressure

- Flow rates
- Total fluid flow rate
- Liquid flow rate
- Gas flow rate
- NAPL flow rate

- Saturation or phase content of a given phase
- Concentration or mass fraction of a given component in a given phase
- Temperature
- Flowing enthalpy
- Injection or production rate of a given phase in a well
- Cumulative injection or production rate of a given phase in a well
- First or second spatial moment of a given phase or component in the model
- Total mass or change of mass of a given phase or component in the model
- Total volume or change of volume of a given phase in the model
- Secondary parameters (relative permeability, viscosity, density, specific enthalpy)
- User-specified observation types
- Prior information

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Page updated: July 25, 1997