The Cerro Prieto geothermal field is a liquid dominated geothermal reservoir of complex geological and hydrological structure. It is 10- cated at the southern end of the Salton-Mexi- Cali trough which includes other geothermal annomalies as Heber and East Mesa. Although in 1973, the initial power plant installed capacity was 75 MW of electrical power, this amount increased to 180 MW in 1981 as field development continued. It is expected to have a generating capacity of 620 MW by the end of 1985, when two new plants will be completely in operation. Questions about field delivera b i l i t y, reservoir life and ultimate recovery related to planned installations are being presently asked. Numerical modeling studies can give very valuable answers to these questions, even at the early stages in the development of a field. An effort to simulate the Cerro Prieto geothermal reservoir has been undergoing for almost two years. A joint project among Comision Federal de Electricidad (CFE), Inst i - t u to de Investigaciones Electricas (IIE) and Intercomp of Houston, Texas, was created to perform reservoir engineering and simulation studies on this field. The final project objective is to simulate the behaviour of the old field region when production from additional wells located in the undeveloped field zones will be used for feeding the new power plants.

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