Table 2: Processing Sequences
A-Prestack Processing :

Brute Stack and Parameter tests

- Demultiplex: IEEE SEG D 86360 bpi produced by Kintex Inc. to
Promax format.
- Crooked line Geometry application, first break picking and trace
editing.
- Elevation static correction: final datum elevation 200 m, 2000 m/s
replacement velocity.
- Select deconvolution, filtering and scaling.
- Velocity Analysis: Semblance and constant velocity stack.
- Stack.
- Migration Parameters Tests: Phase Shift time migration, Kirchhoff
time and depth Migration.

Signal Enhancement (SOS 5 to 9):

- Minimum Phase Spiking Deconvolution (operator length : 80 ms,
white noise: 1%, window: (Offset: 0 m : 100-800 ms, Offset: 1200 m
:300-800 ms).
- Ormsby Band Pass Filter 15-20-70-80 Hz, with NOTCH Filter
Frequency at 60 Hz.
- 2D Weighted Median Filter (1,1,1; 1,2,1; 1,1,1), with linear Move
out Velocity of 1800 m/s).
- Time-Invariant Spectral Balancing (15-20-70-80 Hz , 4 panels).
- 22 -
- 2D Weighted Median Filter (1,1,1; 1,2,1; 1,1,1), with linear Move
out Velocity of 1800 m/s).
- Automatic Gain Control (AGC), with 250 ms operator length.

Signal Enhancement (SOS 1 to 4):

- Minimum Phase Spiking Deconvolution (operator length : 80 ms,
white noise: 1%, window: (Offset: 0 m : 100-800 msecondes, Offset:
1200 m :300-800 ms).
- Ormsby Band Pass Filter 15-20-70-80 Hz, with NOTCH Filter
Frequency at 60 Hz.
- Time-Invariant Spectral Balancing (15-20-70-80 Hz , 4 panels).
- Automatic Gain Control (AGC), with 250 ms operator length.

Final stack:

- Signal Enhancement data input.
- Normal Move out Correction, with stretched mute tolerance of 30%.
- Weighted Stack
- Automatic Gain Control (AGC), with 250 ms operator length.

B-Poststack Processing

Time Migrated Seismic Section:

- Kirchhoff time migration with the same RMS velocity used for the
Stack.
- Automatic Gain Control (AGC) with 800 ms operator length.

Depth Migrated Seismic Section:

- Convert RMS Velocity to smoothed velocity interval
- Kirchhoff depth migration (75 Hz maximum frequency).
- Automatic Gain Control (AGC) with 250 ms operator length.

Crustal Scale Seismic plots:

- Stacked or Migrated seismic section
- Coherency Filter (semblance smooth (59, 59)).
- 5 trace mixing (1,1,1,1,1) for lines 5 to 7.
- 3 trace mixing (1,1, 1) for lines 1 – 4, 8 and 9.
- Plot threshold; data values below 1.5 RMS are set to zero print
plotting