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doi:10.2204/iodp.proc.314315316.102.2009

Appendix

3-D data processing parameters

Processing by CGG (Kuala Lumpur, Malaysia)

1. Resample from 2 ms to 4 ms.
2. Apply low-cut filter 5 Hz 18 dB/Oct.
3. Apply swell noise attenuation.
4. Apply linear noise attenuation using FK filtering.
5. Drop adjacent traces after FK spatial anti-alias filter (receiver interval = 12.5 m).
6. First pass velocity analysis (1 km × 1 km manual picking).
7. Apply 3-D SRME.
8. Apply minimum phase operator.
9. Apply spherical divergence correction TV² using first pass velocities.
10. Apply exponential gain correction 1 dB/s.
11. Second pass velocity analysis (500 m × 500 m manual picking).
12. Automatic high-density velocity picking (100 m × 100 m) with reference velocity from second pass velocity analysis.
13. Shot and channel amplitude correction.
14. 3-D binning (12.5 m × 37.5 m bins).
15. Missing trace interpolation.
16. Bin-centering and regularization.
17. 3-D radon demultiple.
18. Diffracted multiple attenuation.
19. F-X cross-line trace interpolation to 18.75 m bin size.
20. Offset domain multiple attenuation (SPLAT).
21. 3-D anisotropic Kirchhoff prestack time migration (PSTM) with aperture 4 km in inline and cross-line direction, dip = 90°.
22. High-density automatic velocity and estimated time of arrival (ETA) picking every 50 m × 37.5 m for residual move-out (RMO).
23. NMO corrected with RMO velocities and ETA values.
24. Outer and inner trace mute.
25. PSTM stack.
26. Poststack multiple attenuation.
27. Dip-dependent median filter.
28. Apply time variant filter to follow water bottom. For 0–1800 ms, frequency should be 0/18–90/72 Hz/dB. For 2,000–11,000 ms, frequency should be 0/18–50/72 Hz/dB.
29. Apply trace equalization, AGC with operator length = 1000 ms.

Processing by JAMSTEC (Yokohama, Japan)

• 21a. PSDM velocity analy sis with horizon- and grid-based tomography (31 iterations).
• 22a. Kirchhoff prestack depth migration (PSDM).
• 23a. Outer and inner trace mute.
• 24a. PSDM stack.
• 25a. Space and depth variant band-pass filter.

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