1. AGGRADATIONAL SLOPE CANYON EVOLUTION, OFFSHORE EQUATORIAL GUINEA
Zane Jobe

2. Depositional elements
Results
Depositional elements
Canyon fill
Lateral accretion elements
Thalweg elements
Out-of-canyon deposits
Parallel reflectors
Sediment waves
1 km
8x VE
100 msec
λ = 575 m
H = 15 ms

3. Results Canyon evolution Initiation Aggradation! Knickpoint migration
Piracy
Pock mark
Abandonment phase
NOT channel initiation
Fluid escape
Permeablility
Open wound
3 km
200 msec
3 km

4. Equatorial Guinea (EG)

5. HESS concessions in EG
3D Seismic
seismic dataset

6. 3D seismic reflection dataset
15 x 26 km
12.5 x 12.5 m
2 ms
70 Hz
Water depth
1200 m
8x VE

7. Deep-water lateral accretion
LAPs (Abreu et al, 2003)
Bottom current derived (Zhu, 2007)

8. Modern lateral accretion

9. Modern lateral accretion
1100 m wide & 175 ms deep
2 km
1 km

10. Modern lateral accretion
1300 m wide & 230 ms deep
1 km
2 km

11. Miocene lateral accretion
1 km
100 msec

12. Miocene lateral accretion
1 km
100 msec
50 msec
500 m

13. Thalweg elements
1 km
100 msec
50 msec
500 m

14. Parallel reflectors Background sedimentation Bottom current activity?
1 km
Background sedimentation
Bottom current activity?

15. Canyon initiation
Instantaneous Phase

16. Canyon aggradation
1 km
200 ms

17. Canyon aggradation
1 km
200 ms

18. Canyon aggradation
1 km
200 ms

19. Canyon aggradation
1 km
200 ms

20. Canyon aggradation
1 km
200 ms

21. Canyon aggradation
1 km
200 ms

22. Canyon evolution
2 km

23. Canyon evolution
2 km

24. Canyon evolution
2 km

25. Canyon evolution
2 km
2 km +
2 km =

26. Canyon Abandonment: Pock marks

27. Canyon Abandonment: Pock marks

28. Pock marks
350 m wide
50 ms deep
1 km

29. Pock marks A’ A
450 m wide
70 ms deep A’
1 km A

30. Conclusions Highly aggradational canyon morphology
Depositional elements
Canyon fill
Turbidity & bottom current activity
Out-of-canyon deposits
Canyon abandonment
Knickpoint migration
Pock marks
Fluid escape
2 km

31. Acknowledgements
Corporation
Dominic Armitage