1. Beach Energy Ltd Lake Tanganyika 2D Marine Seismic Survey Data Processing, 2014 Source Designature Lines BST14B24 and BST14B67 Jan. 25, 2014

2. ➢ The Designature Operator was derived using the following method ➢ Input the Source Signature wavelet that was modeled by Fugro and supplied in SEGY format ➢ Create the Minimum Phase Equivalent of the Source Signature and taper the amplitudes to remove the gun bubble pulse which adds low frequencies to the data. ➢ Using the Weiner Matching Filter, create an operator that matches the Source Signature to the tapered Minimum Phase Equivalent. ➢ This operator is the Designature Operator ➢ Test the Designature Operator by applying it to the Source Signature wavelet and check for similarity with the Minimum Phase Equivalent wavelet. ➢ This Designature Operator advances event timing by approx. 2 msec and shapes the wavelet to remove the low frequency seismic waves created by the bubble pulse. ➢ Application of the Designature Operator is recommended.

3. Lake Tanganyika 2D Marine Seismic Survey Location of Test Lines

4. Designature Operator Derivation 1. Source Signature (modeled) 2. Min. Phase Equiv. (bubble removed)

5. Designature Operator Derivation 3. Designature Operator 4.Convolution Output (check against #2)

6. Shot Records

7. Shot Gather 1060, Line B24(shallow water), Squelch, FXSwell Applied Before Designature Applied First break 245 msec

8. First break 242 msec Shot Gather 1060, Line B24(shallow water), Squelch, FXSwell Applied After Designature Applied

9. Stacks

10. Brute Stack, Line B24 (shallow water), Squelch, FXSwell, prelim. NMO applied No Designature Applied

11. Brute Stack, Line B24 (shallow water), Squelch, FXSwell, prelim. NMO applied Designature Applied

12. Zoomed Brute Stack, Line B24 (shallow water), Squelch, FXSwell, prelim. NMO applied No Designature Applied

13. Zoomed Brute Stack, Line B24 (shallow water), Squelch, FXSwell, prelim. NMO applied Designature Applied

14. Brute Stack, Line B67 (deep water), Squelch, FXSwell, prelim. NMO applied No Designature Applied

15. Brute Stack, Line B67 (deep water), Squelch, FXSwell, prelim. NMO applied Designature Applied

16. Zoomed Brute Stack, Line B67 (deep water), Squelch, FXSwell, prelim. NMO applied No Designature Applied

17. Zoomed Brute Stack, Line B67 (deep water), Squelch, FXSwell, prelim. NMO applied Designature Applied