BOREHOLE LOGGING METHOD FOR DETERMINING THE DAMPING OF ACOUSTIC TUBE WAVES IN SUBSURFACE FORMATIONS ALONG A BOREHOLE WALL

摘要

BOREHOLE LOGGING METHOD FOR DETERMININGTHE DAMPING OF ACOUSTIC TUBE WAVESIN SUBSURFACE FORMATIONS ALONG A BOREHOLE WALLABSTRACTA borehole logging method for determining the damping ofacoustic tube waves in subsurface formations along a borehole wallemploys an acoustic transmitter and at least one spaced-apartreceiver. The transmitter is excited with a tone burst to cause thetransmitter to resonate and generate acoustic tube waves. The rateof decay of the amplitudes of the tube waves recorded at thereceiver following termination of the excitation of the transmitteris then used to determine the amount of damping of the tube waves inthe subsurface formation along the borehole wall.