A mathematical model composed of two equations for mass and energy balance based on Darcy's law is suitable for numerical simulation of thermal hydraulic behavior in geothermal and Hot Dry Rock reservoirs.
The model may describe the three-dimensional behavior of both water and heat transport in porous media. The simulating code for HDR, named
"GEOTH3D," [Yamamoto et al., 1995] was developed at the Central Research Institute of Electric Power Industry (CRIEPI), and consisted of numerical methods based on three-dimensional finite difference approximations with fully implicit Newton-Raphson treatment of nonlinear terms. The three-dimensional physical properties of the modeled reservoir were determined by combining the data of Acoustic Emissions with the data of permeability tests. We can estimate the continuous temperature and pressure changes in the modeled reservoir and the recovery flow rate. In this paper, we treat the recovery prediction method with comparison to the field data that obtained at Ogachi HDR site in 1994 and 1995 [Yamamoto et al., 1996].

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