3624 CO2地中隔離を目的とした現位置反応法による地下岩体の浸透性制御(S51 温室効果ガス排出抑制技術)

概要

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In the concept of the Carbon dioxide Capture and Storage (CCS), the CO_2 is captured from emission source and stored into geological reservoirs at a depth about 1000m. The injected CO_2 is less dense than water to migrate upward so that the reservoirs should be covered with a sufficiently impermeable seal, i.e. cap rock, for trapping the injected CO_2. However, the cap rock may contain imperfections such as faults and fractures which will be a high permeability path to arise leakage of the injected CO_2 from reservoirs. To overcome such problem, we will present here an idea to reduce artificially the permeability of the leakage paths and rock itself for trapping enhancement. In this idea, a solution is supposed to be injected into the fractures and rocks in concern, and then the permeability should be reduced by clogging the pore space in the fractures and rocks with a material produced by chemical reaction between the injected solution and CO_2.
社団法人日本機械学会の論文
2005-09-18