1. Beach Energy Ltd
Lake Tanganyika 2D Transition Zone Seismic Survey
Data Processing, 2015
De-multiple Tests
Stack Displays
Line BST14A-05
Mar. 30, 2015

2. The following De-multiple methods were tested:
Prestack
Wave Equation Multiple Attenuation
Shallow Water Multiple Elimination
Radon De-multiple
Post-Stack
Post-stack De-multiple
Deconvolution After Stack (DAS)
Pre-stack time migrated stack displays were created with and without
post-stack processing. The post-stack processing included the following:
FX Deconvoltuion
Spectral Equalisation
Bandpass filter
AGC

3. Stack Displays
Sequence
Input field data/Reformat
Add Geometry: (from SPS files)
Spherical Divergence Correction: (V**2)(T**1.2)
Ensemble Balance: entire record scaled
Low-cut filter: 4 Hz
Squelch and Spurious Noise Attenuation
Deghost Summation of OBX hydrophone/geophone
Quash Linear Noise Attenuation
Airgun, Dynamite, Vibroseis sources matched to Marine Airgun data
Pre-stack De-multiple Tests
SC Deconvolution
3 passes velocity picking, 2 passes residual statics
NMO correction: 3rd picked velocities
Prestack Time Migration
Trace Balance: 9 windows
Stack
Post-stack De-multiple Tests
Static Shift to lake level
FX Deconvolution
Spectral Equalisation
AGC
Bandpass Filter Hz
Polarity Reversal
Display: -ve = blue, +ve = red
Note: positive reflection co-eff. = +ve number or red color

4. No De-multiple Applied, PSTM Stack, with post-stack proc.

5. Wave Equation De-multiple Applied, PSTM Stack, with post-stack proc.

6. Shallow Water Multiple Elimination Applied, PSTM Stack, with post-stack proc.

7. Radon De-multiple Applied, PSTM Stack, with post-stack proc.

8. Post-stack De-multiple Applied, PSTM Stack, with post-stack proc.

9. DAS De-multiple Applied, PSTM Stack,with post-stack proc.

10. No De-multiple Applied, PSTM Stack, no post-stack proc.

11. Wave Equation De-multiple Applied, PSTM Stack, no post-stack proc.

12. Shallow Water Multiple Elimination Applied, PSTM Stack, no post-stack proc.

13. Radon De-multiple Applied, PSTM Stack, no post-stack proc.

14. Post-stack De-multiple Applied, PSTM Stack, no post-stack proc.

15. DAS De-multiple Applied, PSTM Stack, no post-stack proc.