| 講演要旨(和文) | | CO2地中貯留を安全かつ効率的に実施するには,圧入されたCO2流体や地下水などの流体の挙動を長期間にわたって追跡することが必要とされている.地下深部の岩盤は一般に間隙率が小さいことから,その水理特性は岩盤内に発達したフラクチャーに支配される.したがって,フラクチャー内の流体の挙動をモニタリングする技術の開発は,CO2地中貯留において重要な研究の一つといえる.水の存在や移動は電気的物性に反映されやすいので,電気・電磁探査はそのようなモニタリングに適した手法と考えられる.そこで,釜石鉱山の坑道内においてフラクチャー岩体への空気圧入実験を実施した.この実験では,坑道壁から花崗閃緑岩体に15度の角度で掘削された試験孔KF-3孔を利用して,コンプレッサーでフラクチャー岩体中に空気を圧入し,圧入前、中、後に比抵抗モニタリングを実施した。本報告では,その結果について紹介する. |
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| | 講演要旨(英文) | | Monitoring of injected CO2 is required in order to perform the geological storage safely and effectively. Since the porosity is generally is small at depth, the hydraulic characteristics are governed by the fractures in the rocks. Therefore, development of the technique which monitors the behavior of the fluid in a fractured rock is one of the important researches in CO2 geological storage. The use of electrical prospecting is expected as one of the monitoring approaches because resistivity is sensitive to changes of gas and water contents in rocks. An air injection experiment was conducted at the Kamaishi Mine, North Japan, to evaluate the effectiveness of resistivity monitoring for the air and water movements in fractured zones. In this experiment, air was injected by a compressor from the top of the KF-3 well, which was aslant drilled in the fractured rock of a granodiorite at the angle of 15 degrees from the tunnel wall. Resistivity data were collected before, during and after the air injection. This paper reports the result of resistivity monitoring. |
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