Transect: Alberta Basement (PRAISE)

Processed By: CGG-Data Processing Services
Date Processed: March 1995

Line 11A Migrated Structure Stack

Location: T: 80 R: 11-19 W6M
Shot Points: 103-2381

No. Processing History Line 11A
1 Format Conversion SEGY reformat: 32 s/0.002 s

Record Length
18 s alternating with 6 s (correlation by sweep)

Sample Interval
0.002 s
2 Amplitude Compensation Spherical divergence correction (V**2) * T
3 Crooked-Line Geometry CDP binning
4 Pre-Deconvolution Corrections Yes

Dynamic Equalization
(trace to trace)
Yes

Window (0.5 s sliding)
0-2 s; Overlap: 50%

Window (1.0 s sliding)
2-18 s; Overlap: 50%

Minumim Phase Conversion
Yes
5 Deconvolution Spiking (trace by trace)

Pre-Whitening
1.0%

Operator Length
0.08 s

Design Windows
(0.4-4 s); (3-6 s)

Design Window
(with offset variations)
(150 m:0.25 s); (425 m:0.35 s); (1650 m:0.75 s); (4925 m:1.7 s); (6125 m:1.85 s)
6 Elevation Statics Corrected to floating datum (FDP)
7 Weathering Statics Calculated from first breaks
8 Velocity Analysis Every 160 CRPS

Constant Stacks
Yes

Contour plots
Yes
9 NMO Corrections Yes
10 Mute Yes

Offset/Time
Varied along the line; 0.04 s (taper)
11 Pre-Stack Corrections Trace to trace dynamic equalization

Window (0.5 s sliding)
0-2 s; Overlap:50%

Window (1.0 s sliding)
2-18 s; Overlap:50%
12 Fixed Datum Statics Yes

Datum
1350 m ASL (structural); 250 m ASL (intermediate)

Replacement Velocity
3000 m/s

Refraction Velocity
3174 m/s
13 Residual Statics Yes

Surface Consistent
Yes

Window
0-2.5 s

Maximum Static
+/- 0.01 s
14 CDP Stacking 60 fold
15 Scaling To compensate for varying fold

Time
6-18 s

Scaler
2.0
16 Pre-Migration Corrections Trace to trace dynamic equalization

Window
0.5 s; Overlap:50%
17 Migration Finite difference- smooth stacking velocity field (90%) & padded traces output
18 Display Adjustments Output SEGY; 2 trace running mix; display every seond trace
19 Filter Zero phase bandpass: ORMSBY

Time Variant
Yes

Operator Length
0.6 s

Time/Pass Band
(0-2.5 s: 5,10,80,100 Hz); (3.5-8.5 s: 5,10,50,70 Hz); (9.5-13.5 s: 5,10,40,60 Hz); (14.5-18 s: 5,10,30,50 Hz)
20 Post-Filter Corrections Trace to trace dynamic equalization

Window
6 s; Overlap: 50%

Other Formats Processed Comments
Structure Stack Yes
DMO Stack Yes
Migrated DMO Stack No