Abstract
Abstract. We have devised a new in situ monitoring method for the amount of stratified compaction in borehole drilled several hundred meters underground. This newly developed epoch-making monitoring system differs from conventional monitoring methods for land subsidence in that it is designed to continuously monitor the amounts of displacement in several intervals separately, using optical fibers fitted in the sensor assembly. This report presents results from a deep observation well. This is a continued report from the previous one on EISOLS 2010.
Highlights
We have devised a new in situ monitoring method for the amount of stratified compaction in borehole drilled several hundred meters underground. This newly developed epoch-making monitoring system differs from conventional monitoring methods for land subsidence in that it is designed to continuously monitor the amounts of displacement in several intervals separately, using optical fibers fitted in the sensor assembly
Gas fields distributed in the Southern Kanto region in Japan – collectively known as the Minami kanto natural gas field – are ranked among the world’s largest for natural gas dissolved in water
The Kujukuri region of Chiba Prefecture has abundant reserves of natural gas dissolved in water and a high concentration of iodine found in brine that represent precious domestically-produced resources for a resource-poor country like Japan (Fig. 1)
Summary
Gas fields distributed in the Southern Kanto region in Japan – collectively known as the Minami kanto natural gas field – are ranked among the world’s largest for natural gas dissolved in water. The Kujukuri region of Chiba Prefecture has abundant reserves of natural gas dissolved in water and a high concentration of iodine found in brine (in which natural gas is dissolved) that represent precious domestically-produced resources for a resource-poor country like Japan (Fig. 1). The problems posed by land subsidence in this area were manifested in the late 1960s. The eight private corporations currently engaged in development in this area are making efforts to address environmental problems, including land subsidence, by organizing the Environment Committee of the Japan Natural Gas Association and Keiyo Natural Gas Association
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