| No. |
Processing History |
Line 2U |
| 1 |
Format Conversion |
SEG-Y to WGC code 4; Data correlated in field |
|
Record Length |
18 s |
|
Sample Interval |
0.004 s |
| 2 |
Geometry and Field Statics |
Yes |
| 3 |
Zone Anomaly Processor (Z.A.P) |
Attenuate anomalous high amplitudes |
| 4 |
Amplitude Compensation |
Geometric spreading using a regional velocity function |
| 5 |
Deconvolution |
Minimum phase inverse filter |
|
Autocorrelation: |
|
|
Near Trace Start Time |
1 s |
|
Linear Start Time Velocity |
5700 m/s |
|
Stop Time |
17.5 s |
|
Number of Windows |
4 |
|
Average Window Length |
5 s; Overlap: 33 % |
|
Prediction Distance |
0.024 s |
|
Operator Length |
0.18 s |
|
Pre-Whitening |
0.1 % |
|
Trace Balance Window |
2-8 s |
| 6 |
CRP Sort |
Crooked profile adjustment |
|
Bin Width |
1000 m |
| 7 |
Residual Statics |
Yes |
|
Surface Consistent Statics |
Miser (automatic) |
|
NMO Corrected |
With 1 regional velocity function |
|
Window |
3-8 s |
|
Maximum Shift |
+/- 0.015 s |
|
Shot and Receiver Statics Corrections |
Yes |
| 8 |
Velocity Analysis |
Picked by lithoprobe personnel |
|
Constant Stacks |
Yes |
| 9 |
Filter |
Surgical 25 Hz lo-cut filter |
|
Offset/Time |
(0 m: 0-0.7 s); (7415 m: 1.5-3 s) |
| 10 |
Amplitude Equalization |
AGC |
|
Window Length |
1 s |
| 11 |
NMO Corrections |
Yes |
| 12 |
Mute |
Picked by lithoprobe personnel |
|
First Break |
Common offset stacks |
| 13 |
Trim Statics |
Using noise attenuated stack as model |
|
Window |
2-8 s |
|
Maximum Shift |
+/- 0.012 s |
| 14 |
Stack |
60 fold; Applying trace weights based on correlation with external model |
| 15 |
Signal Enhancement |
Random noise attenuation (RNA) |
| 16 |
Trace Mix |
3 trace |
|
Weighting |
1-2-1 |
| 17 |
Migration |
Finite difference |
|
Velocity Field/Percent Stacking Velocity |
(0 s: 100 %); (4 s: 100 %); (7 s: 90 %); (15 s: 80 %); (18 s: 80 %) |
| 18 |
Filter |
Time variant (filters interpolated between specified time zones) |
|
Time/Frequency |
(0.1 s: 20-56 Hz); (2 s: 14-56 Hz); (4 s: 8-56 Hz); (18 s: 8-56 Hz) |
|
Slope |
24/48 (DB/OCT) |
| 19 |
Post-Filter Corrections |
Yes |
|
Reflection Strength Gain |
0-1.5 s |
| 20 |
Amplitude Equalization |
RMS |
|
Windows |
(w#1: 0.125 s); (w#2: 0.25 s); (w#3: 0.5 s); (subsequent: 1 s) |