Figure F8. Example of wide quality control log prepared for the sonic log from the sonicVISION tool. Color panels are slowness coherence plots for the common source (left) and common receiver (middle) configurations of the tool. Horizontal axis is slowness, with higher slowness (lower velocity) to the right. Warm colors = high signal strength at a particular slowness. Black vertical lines = manual picks. Gray-scale plot shows seismograms with time increasing to the right. Blue line = arrival pick associated with slowness identified in the picks. Final slowness value at depth is given by the mean of the slownesses picked in the common source and common receiver configurations. This serves to compensate for tool position in the hole. This plot illustrates an interval in which few if any reliable velocity picks are possible. LSF = LWD depth below seafloor.
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