| Title | A Rough Estimation of Deep Geothermal Potentials of the Hohi and Ogiri Areas, Japan with Simplified Numerical Model |
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| Authors | H. Tokita, M. Momita, K. Matsuda, H. Takagi, T. Tosha, and K. Koide |
| Year | 2002 |
| Conference | PNOC-EDC Geothermal Conference |
| Keywords | |
| Abstract | As a study-project of NEDO to assess deepseated geothermal potential in Japan, a method was developed to roughly estimate deep potential by using a simplified numerical model, in which stochastic methods were examined to define deep reservoir parameters such as pressure, temperature and permeability. The Hohi and Oghi areas, which represent faultcontrolled hydrothennal systems, were selected as study areas In Kyushu in fiscal 1999 and 2000, respectively. Deep reservoir parameters estimated by extrapdating the existing shallower parameters to the depth of prospective deeper neservoirs was evah8ted in comparison with the results of reservoir simulation, conducted to represent the hydrothermal convection in the study area. The results showed that the deep temperature could be extrapolated by applying a logarithmic appmximation, because 8 faultcontrolled hydrothermal system has a tendency to form a temperature pmfile that is similar to the saturation teinpemture curve and is reflecting the dominant hydmthermal convection. Simulated results obtained by using the siinplfied numerical models indicated that the deep reservoirs below the existing development fields have almost the same potential as those of the existing Otake-Hatchobaru (1 22.5 M We) and Ogin' (30 W e ) power stations l0~8fed in the respective study areas. |