2016 Fiscal Year Final Research Report
Small scale in situ experiments to inject supercritical and liquid carbon dioxide into rock mass
| Project/Area Number |
25249131
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Earth system and resources engineering
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
直井 誠 京都大学, 工学(系)研究科(研究院), 助教 (10734618)
陳 友晴 京都大学, エネルギー科学研究科, 助教 (80293926)
奈良 禎太 京都大学, 工学(系)研究科(研究院), 助教 (00466442)
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| Project Period (FY) |
2013-04-01 – 2017-03-31
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| Keywords | 二酸化炭素排出削減 / 資源開発工学 / 水圧破砕 / 岩盤 / 破壊 / Acoustic Emission / 微小地震 / 地殻・マントル物質 |
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| Outline of Final Research Achievements |
In the underground sequestration of CO2 (carbon dioxide), large amount of CO2 is injected into rock mass. Since CO2 becomes supercritical state in the deep underground and it is very slick, it is necessary to access effect of the injection on stability of surrounding rock mass. In our study, we injected CO2 into a hole drilled around 10 m long from the floor of a tunnel in a mountain with monitoring of AE (Acoustic Emission: elastic wave radiated with rock fracturing). The results indicated that the AE sources with the CO2 injection distributed larger than those with the water injection. However, with time elapsing after the CO2 injection, AE events that seemed to be caused by crack closing started to be observed. Since these AE events are most likely associated with degassing in the cracks without rock fracturing, it seems that they never bring instability to the surrounding rock mass even if they distribute large.
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| Free Research Field |
岩盤力学
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