Transect: Trans Hudson Orogen (THOT)

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

Line S-3-B Migrated DMO Stack

Location: Manitoba
Shot Points: 101-7581

No. Processing History Line S-3-B
1 Format Conversion SEG-Y reformat to 32 s/0.002 s
Record Length
 18 s;
Correlated by sweep: extending correlations, self-truncating sweep

Sample Interval
 0.002 s
2 Editing Corrections Trace edits
3 Crooked-Line Geometry CDP binning
4 Notch Filter 60 Hz
5 Amplitude Compensation Spherical divergence correction (V**2) * T
6 Deconvolution Predictive (trace by trace)

Operator Length
 0.14 s

Gap
 0.02 s

Pre-Whitening
 0.1 %

Design Windows
 (0-2 s); (2-4 s); (4-6 s); (6-10 s); (10-14 s); (14-18 s)

Design Window (with offset variations)
 (150 m: 0 s); (300 m: 0.45 s); (3250 m: 0.95 s); (8125 m: 1.7 s); (12000 m: 2.5 s)
7 Filter Time Variant Bandpass

Time/Passband
 (0-4 s: 20,25,84,94 Hz); (5-18 s: 8,12,55,65 Hz)
8 Pre-Statics Corrections Dynamic equalization (trace to trace)

Window (0.5 s sliding)
 0-18 s; Overlap:50%
9 Elevation Statics Corrected to floating datum (FDP)
10 Weathering Statics Refraction analysis from first breaks
11 Mute First break (using function supplied by client)
12 NMO Corrections Using function supplied by client
13 Fixed Datum Statics Yes

Structural Datum
 200 m ASL

Replacement Velocity
 6000 m/s

Calculated Velocity
 5505 m/s
14 Residual Statics Yes

Surface Consistent
 Yes

Window
 0.7-8.2 s

Static
 +/- 0.02 s
15 DIP Moveout Using Kirchoff algorithm
16 Stack 60 fold
17 Pre-Migration Corrections Dynamic equalization (trace to trace)

Window (0.5 s sliding)
 0-1.5 s; Overlap: 50%

Window (2 s sliding)
 1.5-5 s; Overlap: 50%

Window (10 s sliding)
 5-18 s; Overlap: 50%
18 Migration Stolt algorithm

Velocity (constant)
 6000 m/s
19 Pre-Filter Corrections Yes

File Format
 SEGY output

Two CDP Sum
 Yes
20 Filter Time Variant Bandpass

Time/Passband
 (0-4 s: 15,25,84,99 Hz); (5-18 s: 3,12,55,70 Hz)
21 Scaler Yes

Scaler (of 2)
 0-0.6 s

Scaler (of 1)
 1.1-18 s

Other Formats Processed Comments
Structure Stack Yes
DMO Stack Yes
Migrated Structure Stack Yes