| No. |
Processing History |
Line 20A |
| 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 |
Crooked-Line Geometry |
CDP binning |
| 3 |
Amplitude Compensation |
Spherical divergence correction (V**2) * T |
| 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 Windows(with offset variations) |
(150 m: 0.25 s); (425 m: 0.35 s); (6125 m: 2.075 s); (11175 m: 3.3 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) |
0.0-2 s; Overlap: 50% |
|
Window (1.0 s sliding) |
2-18 s; Overlap: 50% |
| 12 |
Fixed Datum Statics |
Yes |
|
Datum |
1350 m ASL (structural); 200 m ASL (intermediate) |
|
Replacement Velocity |
3000 m/s |
|
Refraction Velocity |
2750 m/s |
| 13 |
Residual Statics |
Yes |
|
Surface Consistent |
Yes |
|
Window |
0-2.5 s |
|
Maximum Static |
+/- 0.015 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% |