Saturation Function Options (EOR-BO)

STOMP-EOR considers three mobile phases: 1) aqueous, 2) nonaqueous-liquid, and 3 gas, each with a unique relative permeability. Relative permeability often varies by orders of magnitude with saturation and often is the most nonlinear component of the governing equations and constitutive relationships.  Gas is considered to be the non-wetting fluid and the liquid phases are considered to be wetting.  The wettability of the aqueous and non-aqueous liquids can vary between fully aqueous-wet to fully nonaqueous-liquid-wet and all degrees of mixed wet.  The wettability is controlled via the contact angle.  Zero contact angle yields a fully aqueous-wet system, a 90˚ contact angle yields mixed wettability system, and a 180˚ contact angle yields a nonaqueous-liquid wet system.  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) van Genuchten^[1] or 2) Brooks and Corey^[2], and whether the function is extended below residual saturation via the Webb^[3] function.

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