A three-dimensional numerical model of porous type for the Sibayak reservoir is developed which covers an area of 8 x 8 km2 and a depth 2500 m below sea level. In natural state simulations, good agreements are achieved between simulated and measured temperatures in ten wells. In order to assess the reservoir behaviors upon production, simulations are carried out for different well locations. Production simulations without reinjection indicate remarkable decreases both in reservoir pressure and steam production. In this case for generating 30 MWe, steam production decreases by 40 % after 30 years. Reinjecting wastewater at a rate 800 t/h and temperature 120 oC in the layer above production zone moderates the decline of steam production from 40 % to 27 % and also maintains the steam production above 250 t/h for 30 years. This suggests that the Sibayak geothermal field can produce enough steam for 30 MWe over 30 years.

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