| No. |
Processing History |
Line A |
|---|
|
Part I |
|
| 1 |
Format Conversion |
Yes |
|
Demultiplexing |
Yes |
|
Record Length |
20 s |
|
Sample Interval |
0.004 s |
| 2 |
Recording Gain Removal |
Yes |
| 3 |
Geometry Definition |
CMP |
| 4 |
Editing Corrections |
Trace editing |
| 5 |
Resampling |
0.008 s |
| 6 |
Filter |
F-K (in the shot domain) |
|
Pass Band |
4-45 Hz |
|
Dip (per trace) |
+/- 0.005 s |
|
Width |
13 traces |
|
Length |
31 samples |
| 7 |
CDP Sort |
24 or 30 fold |
| 8 |
Amplitude Compensation |
AGC |
|
Window |
1 s |
| 9 |
Velocity Analysis |
Yes |
| 10 |
Preliminary Stack |
Yes |
| 11 |
Multiple Suppression |
In the CDP domain |
|
Correlation Velocity |
1700 m/s |
|
Application Gate |
0-3 s |
| 12 |
NMO Correction |
Yes |
| 13 |
Mute |
First break noise suppression |
| 14 |
Pre-Stack Deconvolution |
Spiking |
|
Operator Length |
59 samples |
|
Windows |
(0-4 s); (3-12 s); (10-20 s) |
| 15 |
Stack |
24 or 30 fold |
| 16 |
Filter |
Bandpass (linear interpolation between application windows) |
|
Time Variant |
Yes |
|
Time/Filter |
(0-2 s: 4,8,30,36 Hz); (5-8 s: 4,8,28,31 Hz); (12-20 s:4,8,25,30 Hz) |
| 17 |
Post-Stack Predictive Deconvolution |
2nd zero crossing |
|
Operator Length |
53 samples |
|
Windows |
(0-5 s); (6-20 s) |
| 18 |
Vertical Sum |
(4 to 1) |
|
CMP Spacing |
50 m |
| 19 |
Amplitude Compensation |
AGC |
|
Window |
2.5 s |
| 20 |
Post-Stack Amplitude Smoothing |
2-D smoother |
|
Smoothing |
3 traces x 3 samples |
|
Part II |
|
| 21 |
Filter |
Yes |
|
Bandpass Filter |
Pre-migration (optional) |
|
Pass Band |
(7,9,35,30 Hz) or (14,17,35,40 Hz) |
|
Velocity Filter |
Pre-migration (optional) |
|
Taper |
+/- (3-3.9) km/s |
| 22 |
Pre-Migration Tests |
F-K Constant Velocity |
|
Velocity Interval |
4000-8500 m/s |
|
Velocity Increment |
< or = 250 m/s |
| 23 |
Migration |
F-K (linearly interpolated and smoothed velocity functions) |
|
Time/Velocity |
(0 s: 5750 m/s); (20 s: 6250 m/s) |
| 24 |
Vertical Sum |
2 to 1 |
|
Trace Spacing |
100 m |
| 25 |
Post-Migration Filter |
Yes |
|
Coherency Filter |
Compute |
|
Dip Passband |
+/- 3 km/s |
|
Trace Aperture |
9 trace |
|
Coherency Filter |
Apply |