This paper describes models of the vapour/liquid phase partitioning behaviour of gas and liquid tracers. Each of these tracer types requires a distinct model. Henry's law is used to model the partitioning of gas tracers and Wilson's representation of the molar excess Gibbs free energy is used as the basis of a model for liquid partitioning. The implementation of these models in the TOUGH2 geothermal reservoir simulator is described and the modified version of TOUGH2 is used to simulate tracer movement in an idealised test problem. Test results show qualitatively expected behaviour..

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