Transect: Trans Hudson Orogen (THOT)

Processed By: Western Atlas International-Western Geophysical
Date Processed: 1992

Line 4 Migrated Stucture Stack

Location: Northern Manitoba
Shot Points: 101-755

No. Processing History Line 4
1 Format Conversion SEG-D to WGC code-4
Record Length
 16.384 s (data correlated in field)

Sample Interval
 0.004 s
2 Pre-Processor Yes

Geometry
 Line

Field Statics
 Yes
3 Amplitude Compensation Geometric spreading using regional velocity
4 CRP Sort Crooked profile adjustment
5 Deconvolution Minimum phase inverse filter

Autocorrelation
 Yes

Near Trace Start Time
 0.2 s

Linear Start Time Velocity
 6000 m/s

Stop Time
 16.384 s

Number of Overlapping Windows
 5

Prediction Distance
 0.024 s

Operator Length
 0.18 s

Percent White Noise
 0.1 %

Trace Balance Window
 2-15 s
6 Drift and Weathering Statics Extended generalized reciprocal method (EGRM);
Statics corrected from surface to datum

Datum Elevation
 400 m ASL

Replacement Velocity
 6000 m/s
7 Residual Statics Yes

Surface Consistent
 Automatic (Miser)

NMO Corrected
 Using regional velocity function

Window
 1-11 s

Maximum Shift
 +/- 0.024 s
8 Velocity Analysis Velocity picked by Lithoprobe personnel

Constant Stacks
 Yes
9 NMO Corrections Yes
10 Mute First break- from shot record displays (picked by Lithoprobe personnel)
11 Trim Statics Using noise attenuated stack as model

Window
 0.5-8 s

Maximum Shift
 +/- 0.02 s
12 Stack Nominal 60 fold
Applying trace weights based on correlation with external model
13 Pre-Filter Signal Enhancement Random Noise Attenuation (RNA)
14 Filter Time Variant

Slope
 24/48 DB/OCT

Time/Frequency
 (0 s: 20-55 Hz); (2.5 s: 20-55 Hz); (5 s: 12-56 Hz); (16.384 s: 12-56 Hz)

Blend Zone
 Between specified times
15 Amplitude Equalization Yes

Windows
 (0-0.5s); (0.5-1 s); (1-1.5 s); (1.5-3.5 s); (3.5-5.5 s); (5-16.384 s)

Other Formats Processed Comments
Structure Stack Yes
DMO Stack Yes
Migrated DMO Structure Stack No