Sonic logs

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A sonic log is an acoustic log that emits sound waves which start at the source, travel through the formation, and return back to the receiver (Schlumberger). The travel time from the source to the receiver is called slowness and as a result sonic logs are sometimes referred to as sonic slowness logs.


A sonic log produces data which illustrates P-wave travel time versus depth (Schlumberger) and is recorded as microseconds per foot (ms/ft). This data provides information about how fast acoustic waves travel through rock.Wave propagation which produces the P-waves in sonic logs follow properties according to Snell’s Law (CPH) and demonstrates how waves travel through different interfaces or rock layers in the subsurface.