New Geophysical Exploration Methods in Nedo "Deep-seated Geothermal Resources Survey
- Key words
- Kakkonda geothermal field, micro-earthquake activities, vertical electromagnetic profiling (VEMP), multi-freceuncy array induction logging (MAIL)
- Location
- Kakkonda, Japan
- Conference
- World Geothermal Congress
- Year
- 1995
- Session
- SECTION 4 ? Exploration and Conceptual Modeling
- Language
- English
- Paper number
- 2-Yasukawa
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Abstract
NEDO began the research project "Deep-seated Geothermal Resources Survey" in A drillhole, WD-I, which will be the deepest (4,000 m class) and hottest (over well in Japan, is being drilled at the Kakkonda geothermal field. In this research project a variety of new geophysical exploration methods are scheduled in addition to conventional ones. Multi-frequency array induction logging and vertical electro-magnetic profiling surveys have been done during intervals in the drilling. To interpret the data, software for a joint analysis of these new electromagnetic methods and the CSMT method will be developed. A longterm microearthquake activity survey will be conducted to monitor the fluid flow in the fracture systems. The data from this survey will be analyzed using seismic wave speeds calculated from VSP data. The conceptual bases for a combined analysis of new and ordinary survey methods are introduced in this paper.
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