continuous velocity logging
continuous velocity logging (sonic log) A technique which provides a record of the single travel time a sound wave takes to pass through the sidewall of a borehole from a sonde source to a receiver, when these are a constant distance apart and on the same down-hole tool. As the tool is drawn up the borehole to the surface a record of the variations in travel time is plotted as a function of down-hole depth. Measured in units of 10−6 feet per second, it provides the inverse of the formation velocity.
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continuous velocity logging