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| | Abstract | | We conducted a quasi-3D seismic survey at the Onikobe geothermal field in 2017 to confirm its effectiveness in mountainous areas where most geothermal resources are reserved. Survey design is crucial in such areas because a limited number of roads that can be used for seismic lines are available. To obtain 3D seismic volume, we used four types of sources and two types of recorders according to surface conditions so that the survey layout was optimized. The effort allowed us to obtain 3D seismic volume in deep part which included potential target zones. Applying geometrical attribute analysis and integrating with other geophysical models highlighted potential fracture zones in the prospective area. The results showed consistency with existing concepts and added new insights in the geothermal reservoir. |
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