发明名称 |
System for detecting substructure microfractures and method therefor |
摘要 |
Bursts of signals at different frequencies are induced into substructure, adjacent a borehole. The return signals from each burst of signals are normalized to compensate for the attenuation, experienced by more distant return signals. The peak amplitudes of return signals, above a selected level, are cut off, and an average signal is produced from the normalized amplitude-limited return signals of each burst. The averaged signals of the return signals of all the signal bursts at the different frequencies are processed, to provide a combined signal, whose amplitude is related to the microfracture density of the substructure adjacent the borehole.
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申请公布号 |
US4168483(A) |
申请公布日期 |
1979.09.18 |
申请号 |
US19770830562 |
申请日期 |
1977.09.06 |
申请人 |
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE ADMINISTRATOR OF THE NATIONAL AERONAUTICS & SPACE ADMINISTRATION |
发明人 |
PARTHASARATHY, SHAKKOTTAI P.;NARASIMHAN, KESHAVAIYENGAR Y. |
分类号 |
E21B47/02;G01V1/44;(IPC1-7):G01V1/40 |
主分类号 |
E21B47/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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