A three dimensional numerical porous reservoir model of the Ogiri geothermal field was developed by the method of inversion analysis using the iTOUGH2 numerical simulator. Natural state simulations were carried out for matching temperature profiles of 11 wells before exploitation. The model was characterized by the presence of high permeable zone that represents main production zone of Ginyu fault and of probable recharge zone at depth located in the eastern part of the field. Permeability of 13 rock types and enthalpy and flow rate of deep recharge were estimated through the simulation. Temperature profiles of the wells located along the Ginyu fault were relativity well matched with the model.

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