Abstract
Natural gas has been produced very much in the east-coast area of the Boso Peninsula which is located in the Kanto natural gas field. In order to produce natural gas, however, it is necessary to pump up the fossil brine water containing natural gas, so that the environmental damage by the natural gas spouting from underground, so-called “Uwagasu”, is observed in case of over pumping in the natural gas field. Many inhabitants on the natural gas field also suffer from the environmental damages mentioned above.On the other hand, those on the natural gas field try to use the Uwagasu damaging the environment as fuel energy and continue to do it conveniently. That is, they succeed in getting the benefits of the Uwagasu. When the spouting natural gas decreases accompanying the decreasing production of natural gas, they rather desire the natural gas industry to pump up more fossil brine water containing natural gas.The gas pressure in the secondary reservoir (mainly the lower part of Holocene deposits) of the natural gas rising upward from its reservoir of great depth is controlled artificially by the beneficial relation between the inhabitants and the natural gas industry. Such a phenomenon as the change of the reservoir-pressure mentioned above seems to keep the relations of dynamic equilibrium between man and nature due to the relations among human groups.
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