| Title | A Modeling Study of the Natural State of the Kirishima Field |
|---|---|
| Authors | Maki, H., Ishido, T., Abe, I., Nobumoto, R., Oikawa, Y. |
| Year | 1988 |
| Conference | Japan International Geothermal Symposium |
| Keywords | |
| Abstract | The New Energy Development Organization (NEOO) is conducting a program entitled Development of Geothermal Reservoir Evaluation Technology. The purpose of the program is to develop methods, including well-testing and computer-assisted numerical modeling, to aid in quantitative understanding of geothermal reservoirs in both the natural state and under conditions of exploitation. NEDO has selected the Kirishima geothermal prospect in southern Kyushu as one of the fields to be investigated under this program. Since 1972, the Nippon Steel Corporation and the Nittetsu Mining Company have been jointly engaged in survey work in the area with the ultimate objective of constructing a geothermal power plant. These companies have carried out a variety of geological and geophysical surveys in the Kirishima area, and have also drilled a number of exploratory wells (the 400 m to 2000 m "KE" series wells). The development of the present mathematical model for the Kirishima (Ginyu) reservoir was accompl ished in an iterative fashion. Given a set of assumptions concerning the reservoir parameter's, a 'natural state' was calculated using numerical simulator·s. Adjustments to unknown parameters were based on comparisons between computed results and measured field data. The natural-state calculation was then repeated; this continued until satisfactory results were obtained. |