Acoustic log: 1. A generic term for well logs that involve acoustic-wave propagation. Includes measurement of the traveltime of P- or S-waves between receivers at different distances (sonic log, continuous-velocity log), measurement of the amplitude of part of the wavetrain amplitude log, display of the full-waveform character log, 3D log, VDL-log, micro-seismogram log, signature log, crossed-dipole log; sometimes named for the logging objective cement-bond log, fracture log. 2. Specifically, a sonic log.
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