| Title | Modelling the Deep Geothermal System of the Uenotai Reservoir |
|---|---|
| Authors | Stephen P. White, Takashi Okabe, Tatuya Sato, Masatake Sato, Takahiro Shiga, Yoshinobu Takahashi |
| Year | 2005 |
| Conference | World Geothermal Congress |
| Keywords | Reservoir Modelling, water-rock interaction, reactive chemical transport |
| Abstract | The Uenotai geothermal field lies 380-km northeast of Tokyo in the Akita Prefecture The reservoir has been in operation since March 1994, operated by the Akita Geothermal Energy Co. Ltd. and supplies steam to the power plant operated by Tohoku Electric Power Company Inc. Currently 28.8 MW of electricity is generated. In this work we have used reactive chemical transport modelling to calculate the rock alteration products and chemistry of the Uenotai reservoir and test the effect of different permeability structures at depth on the calculated pattern of rock alteration. Where agreement between observation and calculation is better for some deep permeability structures than others, then this provides some evidence for choosing a particular permeability structure as being a good representation of the nature of the permeability at depth. This project was conducted as one of the Geothermal Development Promotion Survey Projects of NEDO. |