Dictionary:Acoustic log

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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 (q.v.)