| Project/Area Number |
13450414
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
資源開発工学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SATO Kozo The University of Tokyo, School of Engineering, Professor, 大学院・工学系研究科, 教授 (60322038)
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| Co-Investigator(Kenkyū-buntansha) |
藤永 好宣 東京大学, 大学院・工学系研究科, 助手 (40010988)
藤田 和男 東京大学, 大学院・工学系研究科, 教授 (40272398)
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| Project Period (FY) |
2001 – 2003
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| Project Status |
Completed (Fiscal Year 2003)
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| Budget Amount *help |
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2002: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2001: ¥4,800,000 (Direct Cost: ¥4,800,000)
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| Keywords | Carbon Dioxide / Global Warming / Geological Sequestration / 二酸化炭素問題 |
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| Research Abstract |
The increase in discharge of carbon dioxide is considered as a factor of global warming, and various sequestration technologies are studied. However, the long-term behavior of carbon dioxide is not well understood. The carbon dioxide injected into underground aquifer is stabilized as a gaseous phase, a liquid phase, or a solid phase. The carbon dioxide dissolved in the liquid phase spreads by convection-dispersion phenomena in the aquifer. It is necessary to evaluate the influence of pore-level heterogeneity on the flow behavior. In this research, the experiment using sandstone, carbonate rock, and a pack of glass bead was conducted. A convection-dispersion (CDE) model and the Coats-Smith model were adopted as a flow model, and matching with an experiment result was performed. Application of ODE was successful for a pack of glass bead and sandstone. Moreover, it has been confirmed that the dispersion coefficient was proportional to the flow velocity regardless of the kind of sample. On the other hand, application of CDE was not successful for the dolomite. This is because the secondary pore and the pore-level heterogeneity. When the Coats-Smith model reflecting the heterogeneity was applied, the good matching result was obtained. A large amount of stagnation portion exists in the sample, and it turned out that the rock which has the pore-level heterogeneity may have a large dispersion coefficient compared with the rock and the glass bead without such heterogeneity. When using flow simulators which models dispersion by ODE, using the dispersion coefficient obtained from the Coats-Smith model may result in erroneous predictions. To obtain acceptable-prediction results, it is. necessary to set up an apparent coefficient that is larger than the actual
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