| Title | Imaging of a Geothermal Reservoir using a 4-D Geoelectrical Method |
|---|---|
| Authors | Hideki Mizunaga, Tetsuo Aono and Keisuke Ushijima |
| Year | 2005 |
| Conference | World Geothermal Congress |
| Keywords | Reservoir monitoring, 4-D geoelectrics, 3-D inversion of SP, Reinjection and production wells |
| Abstract | An advanced geoelectrical technique for imaging potential fractures has been developed by the Engineering Geophysics Laboratory in Kyushu University. The method, Fluid Flow Tomography (FFT), has been applied to monitor fluid-flow behaviors during water injection and steam production operations in geothermal areas. Distribution and extension of potential fractures can be evaluated by 3-D inversion of induced self-potential (SP) anomalies as a function of time and resistivity structures can be determined by 3-D inversion of the mise-a-la-masse data in a surveyed area. It is concluded that fluid-flow behaviors in potential fractures could be continuously traced and visualized as a function of time by the FFT method. |