2011 Fiscal Year Final Research Report
Overshoot on fracture transmission coefficient of borehole Stoneley wave and fracture characteristics
| Project/Area Number |
21560844
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 enginnering
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| Research Institution | Hirosaki University |
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Principal Investigator |
SAITO Hiroyuki 弘前大学, 大学院・理工学研究科, 准教授 (70264091)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 地下き裂計測 / 音波検層 / 孔内ストンリー波 / 再生可能エネルギー / 地熱 |
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| Research Abstract |
In this research, we tried to make clear a mechanism of the difference, which was observed between theoretical and measured values in transmission coefficients of borehole Stoneley wave logging. The mechanism was examined by theoretical models, numerical simulation and laboratory experiments. As a result, it was revealed the phase inversion mode of the reflection wave was superimposed on the transmission wave when the Stoneley wave which entered into the fracture returned in the borehole.
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