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SEISMIC VELOCITY BASICS
Velocity From Logs
near trace time to a reflector is:
interval travel time in a layer is:
average velocity is defined as:
RMS velocity is defined as:
far trace time, from ray path geometry 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.
that seismic times are always two way times, and that integrated
sonic log times are usually one way times.