Acoustic borehole logging

G - Physics – 01 – V

Patent

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349/4

G01V 1/40 (2006.01) G01H 13/00 (2006.01) G01V 1/44 (2006.01)

Patent

CA 2011192

An acoustic borehole logging system employs an acoustic transmitter excited by a sweep frequency tone burst to produce an acoustic output having a free-field frequency spectrum of at least one resonant frequency of vibration. A closely-spaced acoustic receiver detects a borehole frequency spectrum that is representative of the acoustic transmitter free-field frequency spectrum altered by the effects of the properties of the subsurface formation materials comprising the borehole wall. Such detected borehole frequency spectrum is recorded in correlation with depth as a log of the material properties of the subsurface formations surrounding the borehole.

Cette invention concerne un système de diagraphie acoustique de forage qui fait appel à un émetteur acoustique excité par une salve de tonalités à fréquence modulée pour produire une émission acoustique à spectre de fréquence en champ libre comportant au moins une fréquence de résonnance. Un récepteur acoustique rapproché détecte un spectre de fréquence correspondant au spectre de fréquence en champ libre de l'émetteur modifié par les propriétés de la formation souterraine qui constitue la paroi du trou de forage. Enregistré en corrélation avec la profondeur, ce spectre de fréquence modifié révèle les propriétés des matériaux constitutifs de la formation souterraine autour du troue de forage.

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