Method and apparatus for borehole acoustic reflection logging

Details Method and apparatus for borehole acoustic reflection logging Method and apparatus for borehole acoustic reflection logging

E - Fixed Constructions

21

B

E21B 47/14 (2006.01) G01V 1/52 (2006.01)

Patent

CA 2185412

A method of characterizing an underground formation surrounding a borehole includes the steps of generating an acoustic signal with a transmitter in a borehole which radiates into the formation surrounding the borehole so as to reflect back to the borehole from any reflecting structures, and detecting the reflected signals at a receiver in the borehole after the arrival of acoustic signals which have passed directly from the transmitter to the receiver. An apparatus for performing this method includes a tool having an acoustic transmitter and receiver, typically with a very short spacing therebetween, and means for detecting acoustic signals which have been reflected from reflecting structures in the formation surrounding a borehole after the arrival of signal which pass directly from the transmitter to the receiver.

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