Accuracy
The accuracy of sonic logs is rather poor, evident by the fact that regular- and long-spaced log measurements often conflict, and this should be taken into account when there are disagreements between seismic data and sonic log data. Other considerations include that the resolution of sonic logs is on a scale of inches whereas seismic reflection data resolution is on the scale of meters, and the two methods use significantly different frequency ranges so travel times will vary due to dispersion.
In order to investigate how the varying size of a borehole has affected a sonic log, the results can be plotted against those of a caliper log.
Read more about this topic: Sonic Logging
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