Transect: (ECSOOT) Eastern Canadian Shield Onshore/Offshore

Processed By: CGG-Data Processing Services
Date Processed: November 1993

Line (6B-D)-(5) FK Migrated Section

Location: Labrador Sea

No. Processing History Line (6B-D)-(5)
1 Format Conversion SEGD reformat: 20 s/ 0.004 s

Record Length
20 s

Sample Interval
0.004 s
2 Cable and Source Adjustment to Sea Level 0.036 s
3 Amplitude Compensation Yes

Spherical Divergence Gain Recovery
(T/250) exp1 (T is in ms)
4 Pre-CDP Gather Filter FK Filter

Full Attenuation Zone
1500-2500 m/s

Attenuation Limit
3500 m/s
5 CDP Collection Yes
6 Deconvolution Trace to trace predictive

Operator Length
0.2 s

Operator Gap
0.036 s

Pre-Whitening
(0.10 %); (1.00 %); (3.00 %)

Design Window (near T)
(0.5-2 s); (2-8 s); (8-20 s)
7 Pre-NMO Corrections Yes

Dynamic Equalization
Trace to trace

Window
2 s; Overlap: 50%
8 Multiple Attenuation Subtraction of Wave Equation Model (WEMOL)
9 NMO Corrections Revised
10 Post-NMO Mutes Yes
11 CDP Stack 45 fold (sort weight)
12 Post-Stack Deconvolution Trace to trace predictive
13 7 Trace Mix (weighted) Yes
14 Post-Stack Corrections Dynamic equalization (trace to trace)

Window (0.4 s)
0-4 s; Overlap: 50%

Window (1.0 s)
3-10 s; Overlap: 50%

Window (2.0 s)
9-20 s; Overlap: 50%
15 Migration Yes

FK Migration
Smooth and reduced stacking velocities
16 Post-Migration Corrections Decimate to every fourth trace
17 Filter Coherency
18 Reflection Corrections Reflection Power Law Gain
19 Filter Zero phase bandpass: ORMSBY

Time Variant
Yes

Operator Length
0.3 s

Time/Pass Band
(0 s: 6,12,55,70 Hz); (12-20 s: 4,8,30,40 Hz)
20 Post-Filter Corrections Dynamic equalization (trace to trace)

Window (0.4 s)
0-4 s; Overlap:50%

Window (1 s)
3-10 s; Overlap:50%

Window (2 s)
9-20 s; Overlap:50%

Other Formats Processed Comments
Structure Stack Yes
DMO Stack No