| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Outline of Final Research Achievements |
In order to evaluate caprock’s sealing ability and injectivity into reservoir rocks over the long term on geological CO2 storage, this study examined hydrological changes of various sedimentary rocks during geochemical reactions. The rock samples were reacted under conditions of 10 MPa and 40℃ for up to one month. Then their permeability and threshold pressure were measured. The threshold pressure is defined as the capillary pressure at the moment when CO2 penetrates through a rock filled with water for the first time. The results showed that geochemical impacts to hydraulic characteristics strongly depend on rock types and that the relationship between the pore throat size distribution within rocks and mineral compositions (i.e., the carbonate content of rocks) is the controlling factor.
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