System for detecting substructure microfractures and method ther

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging

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181102, 181105, 367 28, G01V 140

Patent

active

041684834

ABSTRACT:
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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