3D high-resolution seismic characterization of deep offshore Niger Delta Basin: What’s new!
- Authors
- Uzonna Anyiam (Oklahoma State University) | Emmanuel Uzuegbu (Schlumberger) | Smart Igbokwe (Shell Nigeria Exploration and Production Company)
- Document ID
- SEG-2018-2998438
- Publisher
- Society of Exploration Geophysicists
- Source
- 2018 SEG International Exposition and Annual Meeting, 14-19 October, Anaheim, California, USA
- Publication Date
- 2018
- Document Type
- Conference Paper
- Language
- English
- Copyright
- 2018. Society of Exploration Geophysicists
- Keywords
- Seismic attributes, Deepwater, 3D, Reservoir characterization, High-resolution
- Downloads
- 0 in the last 30 days
- 20 since 2007
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| Price: | USD 21.00 |
In the Freeman Field, located about 120km offshore southwestern Niger Delta at about 1300m water depth, 3D seismic attribute-based analogs, and structural and stratigraphic based geometric models are combined to help enhance and constrain interpretation. The objective of this research was to aid in the prospecting of Miocene to Pliocene Agbada Formation reservoirs in the deep offshore Niger Delta Basin. Multidisciplinary approaches – analysis of root-mean-square amplitude attribute, iterative integrated seismic interpretation and structural modeling, were employed in this study. Results reveal a massive northwest-southeast trending shale-cored detachment fold anticline containing numerous associated normal faults. This structure is interpreted to have been deformed by differential loading of the undercompacted, overpressured, and ductile Akata shale during syndepositional gravitational collapse of the Niger Delta slope. Crestal extension in the anticline resulted in a complex array of synthetic and antithetic normal faults, which include crossing-conjugate pairs. These conjugate structures could significantly affect permeability and reservoir performance. Crossing-conjugate faults have not previously been recognized in the Niger Delta, and similar structures may be present in other hydrocarbon-trapping structures in the basin. Also, the Miocene to Pliocene Agbada Formation reservoirs occur as part of a channelized fan system, mostly deposited as turbidites in an unconfined distributary environment, except one reservoir sand that occurs as channel sand within a submarine canyon that came across and eroded a previously deposited distributary fan complex, suggesting likely presence of prospective areas for hydrocarbon exploration southwest of the Freeman Field.
Presentation Date: Thursday, October 18, 2018
Start Time: 8:30:00 AM
Location: 210A (Anaheim Convention Center)
Presentation Type: Oral
| File Size | 664 KB | Number of Pages | 5 |
Avbovbo,A. A.,1978,Tertiary lithostratigraphy of Niger Delta:AAPG Bulletin,62,295–306,10.1306/c1ea482e-16c9-11d7-8645000102c1865d.
Chapin,M.,P.Swinburn,R.Van Der Weiden,D.Skaloud,S.Adesanya,D.Stevens,C.Varley, andJ.Wilkie,2002,Integrated seismic and subsurface characterization of Bonga Field offshore Nigeria:The Leading Edge,21,1125–1131,10.1190/1.1523745.
Corredor,F.,J. H.Shaw, andF.Billoti,2005,Structural styles in the deep-water fold and thrust belts of the Niger Delta:AAPG Bulletin,89,753–780,10.1306/02170504074.
Damuth,J. E.,1994,Neogene gravity tectonics and depositional processes on the deep Niger Delta continental margin:Marine and Petroleum Geology,11,320–346,10.1016/0264-8172(94)90053-1.
Ferrill,D. A.,A. P.Morris,J. A.Stamatakos, andD. W.Sims,2000,Crossing conjugate normal faults:AAPG Bulletin,84,1543–1559,10.1306/8626bef7-173b-11d7-8645000102c1865d.
Horsfield,W. T.,1980,Contemporaneous movement along crossing conjugate normal faults:Journal of Structural Geology,2,305–310,10.1016/0191-8141(80)90018-8.
Nicol,A.,J. J.Walsh,J.Watterson, andP. G.Bretan,1995,Three-dimensional geometry and growth of conjugate normal faults:Journal of Structural Geology,17,847–862,10.1016/0191-8141(94)00109-D.
Sprague,A.,T.Garfield,F.Goulding,R.Beaubouef,M.Sullivan,C.Rossen,K.Campion,D.Sickafoose,V.Abreu,M.Schellpeper,G.Jensen,D.Jennette,C.Pirmez,B.Dixon,D.Ying,J.Ardrill,D.Mohrig,M.Porter,M.Farrell, andD.Mellere,2005,Integrated slope channel depositional models: The key to successful prediction of reservoir presence and quality in Offshore West Africa (abs.),inD.Hodgson,S.Flint, andT.Garfield,conveners,Submarine Slope Systems: Processes, Products, and Prediction, Conference,Abstracts,1–13.
Watterson,J.,A.Nicol,J. J.Walsh, andD.Meier,1998,Strains at the intersections of synchronous conjugate normal faults:Journal of Structural Geology,20,363–370,10.1016/S0191-8141(97)00100-4.
