# Difference between revisions of "Dictionary:Sonic log"

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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 <b>acoustic-velocity log</b> and <b>continuous-velocity log</b>. Usually measured with frequencies 1 to 50 kHz. Used for porosity determination by the ''time-average equation'' (q.v.). 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. See Figure [[Special:MyLanguage/Dictionary:Fig_S-13|S-13]] and also ''[[Special:MyLanguage/Dictionary:cycle_skip|cycle skip]], [[Special:MyLanguage/Dictionary:dipole_sonic_log|dipole sonic log]], [[Special:MyLanguage/Dictionary:array|array log]], [[Special:MyLanguage/Dictionary:cement-bond_log_(CBL)|cement bond log]]'', and ''[[Special:MyLanguage/Dictionary:fracture_log|fracture 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 <b>acoustic-velocity log</b> and <b>continuous-velocity log</b>. Usually measured with frequencies 1 to 50 kHz. Used for porosity determination by the ''time-average equation'' (q.v.). 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. See Figure [[Special:MyLanguage/Dictionary:Fig_S-13|S-13]] and also ''[[Special:MyLanguage/Dictionary:cycle_skip|cycle skip]], [[Special:MyLanguage/Dictionary:dipole_sonic_log|dipole sonic log]], [[Special:MyLanguage/Dictionary:array|array log]], [[Special:MyLanguage/Dictionary:cement-bond_log_(CBL)|cement bond log]]'', and ''[[Special:MyLanguage/Dictionary:fracture_log|fracture log]]''. | ||

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## Latest revision as of 10:52, 25 September 2017

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* (q.v.). 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. See Figure S-13 and also *cycle skip, dipole sonic log, array log, cement bond log*, and *fracture log*.