Calibration of AE Measuring System by Detonator Test

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  • ディトネータテストによる三軸AE計測系の校正
  • ディトネータテストによる3軸AE計測系の校正
  • ディトネータ テスト ニ ヨル 3ジク AE ケイソクケイ ノ コウセイ

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Abstract

A simple technique to calibrate a downhole AE system to locate subsurface cracks is presented. Cross-hole detonation tests were employed for the calibration. In situ P-wave velocity in the formations is estimated from the P-wave arrival time. A simple formula associated with an appropriate filtering is proposed to equalize the difference of the frequency dependent coupling of tri-axial accelerometers set in a downhole AE sonde. Consideration ofthe ray path and the coupling compensation reduces the mapping error.<BR>Data measured at Higashi Hachimantai Field supports the validity of this technique. The accuracy achieved in the mapping of the AE source lies within 10 degrees in all directions.

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