Hydrothermal Convection System of the Kakkonda Geothermal Field, Japan
- Key words
- geothermal reservoir, geothermal system, hydrothermal system, Kakkonda, natural convection
- Location
- Kakkonda, Japan; Sengan geothermal area
- Conference
- World Geothermal Congress
- Year
- 1995
- Session
- SECTION 6 - Resource Evaluation and Modeling
- Language
- English
- Paper number
- 3-hanano
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Abstract
Hydrothermal convection in the Kakkonda liquid-dominated geothermal area evolved within a tectonically controlled fractured zone. There are two reservoirs with different temperatures and permeability in the Kakkonda hydrothermal system. The shallow reservoir is permeable and 230 to while the deep reservoir is less permeable and 350 to 360?C. However, they are hydraulically connected to each other. Recent drilling of deep wells revealed existence of neo-granitic pluton (Kakkonda Granite) with an age of 0.34 to This pluton is a heat source for metamorphism in the Kakkonda reservoir, however, accounting for the regional temperature distribution, this pluton is only one of the heat sources of this area. A micro-earthquake study revealed that the up flow into the reservoir came from great depths from the northwest of the reservoir
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