AGGRADATIONAL SLOPE CANYON EVOLUTION, OFFSHORE EQUATORIAL GUINEA

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Presentation transcript:

AGGRADATIONAL SLOPE CANYON EVOLUTION, OFFSHORE EQUATORIAL GUINEA Zane Jobe

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

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

Equatorial Guinea (EG)

HESS concessions in EG 3D Seismic seismic dataset

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

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

Modern lateral accretion

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

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

Miocene lateral accretion 1 km 100 msec

Miocene lateral accretion 1 km 100 msec 50 msec 500 m

Thalweg elements 1 km 100 msec 50 msec 500 m

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

Canyon initiation Instantaneous Phase

Canyon aggradation 1 km 200 ms

Canyon aggradation 1 km 200 ms

Canyon aggradation 1 km 200 ms

Canyon aggradation 1 km 200 ms

Canyon aggradation 1 km 200 ms

Canyon aggradation 1 km 200 ms

Canyon evolution 2 km

Canyon evolution 2 km

Canyon evolution 2 km

Canyon evolution 2 km 2 km + 2 km =

Canyon Abandonment: Pock marks

Canyon Abandonment: Pock marks

Pock marks 350 m wide 50 ms deep 1 km

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

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

Acknowledgements Corporation Dominic Armitage