Transect: Trans Hudson Orogen (THOT)

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

Line 1A HR Migrated DMO Section

Location:Northern Manitoba
Shot Points: 101-651

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

Sample Interval
 0.002 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
 4.096 s

Number of Overlapping Windows
 4

Prediction Distance
 0.002 s

Operator Length
 0.12 s

Percent White Noise
 0.1 %

Trace Balance Window
 1-3 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
 0.5-3 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
 0-3 s

Maximum Shift
 +/- 0.02 s
12 Inverse NMO Correction Yes
13 DIP Moveout Common offset domain; Partial stack

Fold Gathers Generated
 30 fold
14 Velocity Analysis Velocity picked by Lithoprobe personnel

Constant Stacks
 Yes
15 Stack Nominal 120 fold;
Applying trace weights based on correlation with external model
16 Pre-Filter Signal Enhancement Yes

Radial Predictive Filter (RPF)
 0-0.5 s

Random Noise Attenuation (RNA)
 1-4 s

Blend Zone
 0.5-1 s
17 Filter Time Variant

Slope
 24/48 DB/OCT

Time/Frequency
 (0 s: 40-130 Hz); (0.5 s: 40-130 Hz); (1 s: 30-130 Hz); (4.096 s: 30-130 Hz)

Blend Zone
 Between specified times
18 Amplitude Equalization Yes

Windows
 (0-0.5s); (0.5-1 s); (1-1.5 s); (1.5-2.6 s); (2.6-4.096 s)
19 Migration FK Stolt (using 90 % DMO velocities)

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