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Calculating Seismic
Velocity From Logs The
near trace time to a reflector is: The
interval travel time in a layer is: The
average velocity is defined as: The
RMS velocity is defined as: The
far trace time, from ray path geometry is: Normal
moveout is: These equations are used to evaluate various layered models (ray tracing), and the reverse equations are used to calculate interval velocity from seismic data. The equations apply to both compressional and shear data, when appropriate inputs are used. Note
that seismic times are always two way times, and that integrated
sonic log times are usually one way times. 

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