1991 nendo chinetsu kaihatsu sokushin chosa hokokusho No.30. Hakkoda seibu chiiki funkichu kankyo eikyo chosa. (No.30 survey report on promotion of geothermal energy development in 1991. Survey of environmental effects of fumarolic gas in the Hakkodo area)
(Englisch)
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The paper investigates how hot springs are affected by drilling of environmental survey wells and blowout/injection of geothermal fluids which are incidental to the geothermal energy development in the Hakkoda west area. Hot springs for survey are classified as follows: Sukayu hot springs; acidity-containing Al-Ca-SO4 spring, Jogakura No.2 spring, Na-HCO3-Cl-SO4 type simple spring, Jogakura No.3 spring; alcaline/Na-HCO3 type simple spring, Kansuizawa hot spring; Na-HCO3, Cl spring. As compared with the environmental survey in fiscal 1989 before blowout, the hot springs except Jogakura No.3 spring were relatively smaller in variations and brought almost stabilized results. Moreover, large variations in each survey item relating to Jogakura No.3 spring agreed with those at the time of stopping pumping facilities due to reduction in output of hot water, and it is hard to think that it was caused by drilling of geothermal exploratory wells. Accordingly, there are seen no effects of drilling for geothermal exploration on the neighboring hot springs. For geothermal survey, however, it is desirable to investigate hydrologic structures and then to take measures such as injection of all geothermal water into the depth of the underground. 4 refs., 13 figs., 7 tabs.
1991 nendo chinetsu kaihatsu sokushin chosa hokokusho No.30. Hakkoda seibu chiiki funkichu kankyo eikyo chosa. (No.30 survey report on promotion of geothermal energy development in 1991. Survey of environmental effects of fumarolic gas in the Hakkodo area)