Transect: Trans Hudson Orogen (THOT)

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

Line S-1-A Migrated DMO Stack

Location: Saskatchewan
Shot Points: 101-4953

No. Processing History Line S-1-A
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 Amplitude Compensation Spherical divergence correction (V**2) * T
5 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)
 (275 m: 0 s); (350 m: 0.3 s); (1725 m: 0.7 s); (8125 m: 1.8 s); (12000 m: 2.5 s)
6 Mute 0.04 s taper

Offset/Time
 (275 m: 0 s); (350 m: 0.3 s); (1725 m: 0.7 s); (8125 m: 1.8 s); (12000 m: 2.5 s)
7 Pre-Statics Corrections Dynamic equalization (trace to trace)

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

Structural Datum
 400 m ASL

Replacement Velocity
 6000 m/s

Calculated Velocity
 5744 m/s
12 Residual Statics Yes

Surface Consistent
 Yes

Window
 0.2-7.6 s

Static
 +/- 0.01 s
13 DIP Moveout Using Kirchoff algorithm
14 Stack 60 fold
15 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%
16 Migration Stolt algorithm

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

File Format
 SEGY output

Two CDP Sum
 Yes
18 Filter Time Variant Bandpass

Time/Passband
 (0-3 s: 15,20,80,100 Hz); (4-8 s: 8,12,70,80 Hz); (9-18 s: 8,12,60,70 Hz)
19 Scaler Yes

Scaler (of 2)
 0-0.4 s

Scaler (of 1)
 1-18 s

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