C0002A sonic processing note

1) Overall,the final compressional was labelled based on all of three processing(Wide-band MPS of drilling mode, Leaky-P & Wide-band MPS of fast configuration),not only one of them;
2) Above 2570m measured depth, I was using a combination of Wide-band MPS of drilling mode, Leaky-P & Wide-band MPS processing of fast configuration;
3) Below 2570m measured depth, I mainly took Wide-band MPS compressional of drilling mode as final compression. Some small intervals might be used others;
4) Leaky-P mode labelled compressional was only applied in the case none of Wide-band MPS is good;
5) In the processing, I defined three zones considering using a different parameter at each zone, they don't represent geological meanning. Zones are:
   Zone 1: top ~ 2511m; (Extremly slow formation)
   Zone 2: 2511m ~ 2942m;(Very slow formation)
   Zone 3: 2942m ~ bottom;(Slow formation)
6) Based on scients' suggestion, some absent values were left in the final compressional for extremly difficulty intervals;
7) Basically labelled compressional is good, users can check with STC coherence to find out.

Liu Wei
Data & Consulting Services
Beijing CHG, Schlumberger


For Hole C0001C and C0001D we got SLB proprietary data (Produce). We should never had received those (only the processed). So we do not have those for Hole c0002A.

Philippe Gaillot

Note
The depth in this document is the meter from KB (Drill floor on Chikyu), therefor you should subtract 1964.5m to convert mbsf (meter below sea floor).
MPS_Wide: wide frequency band processing
LeakyP:   frequency dispersion processing