| Title | Reservoir Monitoring by Continuous Self-Potential Measurements and a Preliminary History Matching Study, the Ogiri Geothermal Field, Japan |
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| Authors | Toshiyuki Tosha, Tsuneo Ishido, Kazunori Goko, and Koichi Yokoi |
| Year | 2005 |
| Conference | World Geothermal Congress |
| Keywords | SP monitoring history-matching simulation model |
| Abstract | We have been conducting continuous self-potential (SP) measurements at the Ogiri geothermal field, southwest Japan, where a geothermal power plant is operating. The objective of the measurements is to detect SP variations caused by changing reservoir conditions and to use the observed data in history-matching studies of reservoir models. We observed short-term changes in SP during the production test of exploratory wells at the Shiramizugoe field, located about 2 km southeast of the Ogiri field in 2002, and changes in SP associated with field-wide flow-rate change during the maintenance period of the power plant in 2003. We present the observed SP data and interpret them on the basis of reservoir simulation and the EKP-postprocessor calculations. |