Reservoir Monitoring by Continuous Self-Potential Measurements and a Preliminary History Matching Study, the Ogiri Geothermal Field, Japan
- Key words
- SP monitoring history-matching simulation model
- Location
- Ogiri, Japan
- Conference
- World Geothermal Congress
- Year
- 2005
- Session
- 17. Software for Geothermal Applications
- Language
- English
- Paper number
- 1163
Full text
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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.
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