Acoustic velocity log: Sonic log. A well log of the traveltime (transit time) for seismic waves per unit distance, usually measured in microseconds per foot, which is the reciprocal of the P-wave velocity. Also called acoustic-velocity log and continuous-velocity log. Usually measured with frequencies 1 to 50 kHz. Used for porosity determination by the time-average equation . The interval transit time is integrated down the borehole to give total one-way traveltime. For the compensated sonic log, two transmitters are pulsed alternately and measurements are averaged to cancel errors due to sonde tilt or changes in hole size. Related to cycle skip, dipole sonic log, array log, cement bond log, and fracture log.

Sonic log. (a) Schematic compensated sonic logging sonde. (b) Sonic log.

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