In this paper one aspect of an ongoing research program will be described. The overall objective is to develop reliable computer simulators whereby field information for a specific liquid-or vapor-dominated geothermal system can be used to predict reservoir performance and, in addition, subsurface environmental effects. These latter effects include land surface subsidence, induced seismic activity, and pollution of fresh water aquifers by geothermal brines. The approach is to develop large-scale computer programs and to validate them using both laboratory measurements and field data.

So far, separate codes have been developed for describing the multidimensional multiphase unsteady flow of steam and water and of heat in a heterogeneous geologic setting in the absence of rock deformation, and for calcuiating the response of a multidimensional rock matrix to prescribed pore pressure changes without specific consideration of fluid flow. These codes are presently being combined to produce a single fuly n interactive fluid flow/rock deformation simulator. The separate codes themselves may be of some interest, however; S. K. Garg discussed the finite-element rock-deformation simulator in another presentation at the workshop. Here, the fluid-flow simulator will be discussed.

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