Acoustic frequency spectrum logging

Details Acoustic frequency spectrum logging Acoustic frequency spectrum logging

1980-04-21

1982-03-09

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 30, 367 49, 367 65, G01V 140, G01V 130

Patent

active

043193463

ABSTRACT:
A method for developing an acoustical well log which displays the frequency content of a broad spectrum acoustical signal by discrete windows of the frequency spectrum, the final display being developed concurrently with the taking of the log and being shown with respect to depth. The method employs a spectrum analyzer and, in a single receiver embodiment, a correction circuit for compensating for attenuation introduced by the communication cable from the well-logging sonde to the surface where the recordings are produced. A two receiver embodiment develops and displays the frequency content as amplitude differences at a plurality of frequencies, automatically compensating for cable attenuation.

REFERENCES:
patent: 3150327 (1964-09-01), Taylor
patent: 3180445 (1965-04-01), Schwartz et al.
patent: 3292143 (1966-12-01), Russell
patent: 3327805 (1967-06-01), Glazier et al.
patent: 3697937 (1972-10-01), Ingram
patent: 4046220 (1977-09-01), Glenn
patent: 4114721 (1978-09-01), Gleen
patent: 4217659 (1980-08-01), Glenn
Chaney et al., "Some Effects of Frequency . . . Logs", 4/66, pp. 407-411, Journ. of Petro. Tech.

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