System for detecting substructure microfractures and method ther

Details System for detecting substructure microfractures and method ther System for detecting substructure microfractures and method ther

1977-09-06

1979-09-18

Birmiel, Howard A.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

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.

REFERENCES:
patent: 3292143 (1966-12-01), Russell
patent: 3332512 (1967-07-01), Sundt
patent: 3406776 (1968-10-01), Henry
patent: 3447126 (1969-05-01), Reid
patent: 3524162 (1970-08-01), Zill
patent: 3636463 (1972-01-01), Ongkiebong
patent: 3731268 (1973-05-01), Landrum, Jr.
patent: 3781785 (1973-12-01), Balch
patent: 3909775 (1975-09-01), Lavigne
patent: 3924260 (1975-12-01), Braham et al.

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