WellCAD Basics - Advanced Logic Technology

344 - APPENDIX A
Full Wave Sonic Log
www.alt.lu
Description:
FWS Log (Full Waveform Sonic) data is a two dimensional array of floating point
values. One dimension consists of depth, sampled at a constant rate, the second
dimension usually consists of time in �s, sampled at a constant rate, too. Thus, for
each depth increment the log holds a data trace sampled in time. The FWS log is
most commonly used to store and display full waveform sonic data but can also
used to display spectral gamma, borehole radar data, slowness or T2 distribution
curves. The horizontal dimension can be “misused” and must not necessarily
correspond to time in �s all the time. When importing FWS data from an ASCII file
the user can set calibrate the data corresponding to the equation y � a � bx ,
where a is an offset and b is the horizontal sampling step.
Data Format:
E.g.
Display Styles:
Depth, Data1, Data2, Data3, … ,DataN
FWS Log data presented as Wiggle, b/w VDL and color VDL.