Discrimination of coherent waves by a downhole double three component seismic detector
| Project/Area Number |
09651025
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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 |
資源開発工学
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| Research Institution | Tohoku University |
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Principal Investigator |
ASANUMA Hiroshi Graduate School of Tohoku University, Faculty of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (50250717)
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| Co-Investigator(Kenkyū-buntansha) |
MORIYA Hirokazu Graduate School of Tohoku University, Faculty of Engineering, Research Associate, 大学院・工学研究科, 助手 (60261591)
NIITSUMA Hiroaki Graduate School of Tohoku University, Faculty of Engineering, Professor, 大学院・工学研究科, 教授 (90108473)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | COHERENT WAVE / DOWNHOLE DETECTOR / MULTICOMPONENT / F-T DISTRIBUTION / 3D HODOGRAM / SEISMIC SIGNAL / POLARIZATION / REFLECTION SURVEY |
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| Research Abstract |
(a) Development of double detector : We developed a downhole double three component detector using two three component detectors which have been designed and manufactured at Tohoku University. In-situ calibration the detector was carried out in Tohoku University Higashi-Hachimanatai Field. It has been revealed that the detector has a detectability of hodogram up to 200 Hz.
(b) Investigation on signal processing : A method which enables coherence analysis of the three dimensional hodogram. A spectral-matrix-based method (3D-TFC) showed good potential for this purpose.
(c) Field measurement : We carried out a field measurement of AE at Kakkonda Geothermal Field and recorded AE events with good quality.
(d) Analysis of field data : Coherent phase, including direct arrival and reflected, in the AE events from Kakkonda were detected by the 3D-TFC method. The result was consistent with other geological information and reflection survey.
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Report
(3 results)
Research Products
(16 results)
