STOMP

Saturation Function Card Options (HYDT-KE)

STOMP-HYDT-KE considers three mobile phases: 1) aqueous, 2) nonaqueous-liquid, and 3 gas.  Gas is considered to be the non-wetting fluid and the liquid phases are considered to be wetting. The saturation function and associated parameters are considered to be intrinsic properties of the rock/soil.  As such the saturation functions are specified in reference to rock/soil types. The current version of the simulator allows the user to select one of two base saturation versus capillary head functions: (1) the van Genuchten function[2] or (2) the Brooks and Corey function[1],

Hydrate-Normalized Mobile Saturations

Mobile saturations are normalized by the hydrate saturation to determine effective saturations for use with common saturation functions.

 

The effective aqueous liquid saturation is:
The effective aqueous nonaqueous liquid saturation is:
The wetting phases are combined for a total effective liquid saturation:

Capillary Pressure Functions

The van Genuchten and Brooks Corey gas-nonaqueous liquid and nonaqueous-aqueous liquid capillary pressure functions are shown as functions of the effective liquid saturations.

Van Genuchten

 

Brooks Corey

 

References

1. Brooks, R.H. and Corey, A.T.: “Hydraulic properties of porous media,” Hydraulic paper no. 3, Colorado State University, 1964.

2. van Genuchten, M. Th. 1980. “A closed-form equation for predicting the hydraulic conductivity of unsaturated soils.” Soil Sci. Soc. Am. J., 44:892-898.

 

 

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