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Seismic and stratigraphic expression of heterogeneous crustal deformation during South Atlantic rifting, Campos Basin, Brazil

Author(s): David Sanford Lewis Maersk Oil North Sea UK Limited, United Kingdom
Scott Pearse Maersk Oil North Sea UK Limited, United Kingdom
Alaister Shakerley Maersk Olie og Gas AS, Copenhagen, Denmark
Kristan Reimann Maersk Olie og Gas AS, Copenhagen, Denmark

Understanding the processes controlling the evolution of rift architecture is a critical step towards petroleum exploration success, especially in basins where the source rocks and/or reservoirs were deposited in syn-rift stratigraphy. Rifted margin extensional geometry, timing, and subsidence history are crucial inputs into the models of heat flow and burial history that constrain the evolution of petroleum systems. Recent work in rifted margins reported in the literature has suggested that extensional processes vary significantly in character, spatial distribution, and timing from margin to margin, or even along a contiguous margin.

Lewis et al. (2014) presented a study of extension timing in the Campos Basin, Brazil, based on detailed well correlations and seismic interpretation. This work proposed that the brittle rift deformation recorded in tilted fault blocks below the “sag” deposits was post-dated by a phase of deep-seated, ductile extension, indicating that active extension continued thickness of the plate, considering alternative paleo-water depth estimates, altering density estimations, and varying syn-rift to post-rift transition timing. The remaining subsidence recorded in the stratigraphy after backstripping is the tectonic component attributable to active extension. Comparison of the total expected tectonic subsidence to the subsidence evident in imaged brittle structures in the region of the Campos Basin Hinge allows a determination of the role of heterogeneous crustal deformation and the applicability of the deep-seated ductile extension model.

Lewis, D.S., Ensley, R., and Leander, M., 2014. New insights into timing and distribution of late synrift subsidence from detailed well ties and seismic mapping, Campos Basin, Brazil. In: Pindell, J., Horn, B., Rosen, N., Weimer, P., Dinkleman, M., Lowrie, A., Filion, J., Granath, J., and Kennan, l., (eds.), Sedimentary Basins: Origin, Depositional Histories, and Petroleum Systems: 33rd Annual GCSSEPM Foundation Bob F. Perkins Research Conference, 33, 98-115.


Title:
Seismic and stratigraphic expression of heterogeneous crustal deformation during South Atlantic rifting, Campos Basin, Brazil
Type:
Oral
Origin:
Industry
Day:
2
Session:
1
Daily sequence no.:
06
Lead author last name:
Lewis
Lead author first name:
David Sanford
Affiliation(s):
Maersk Oil North Sea UK Limited
Country:
United Kingdom
Abstract status:
All ok
UID:
39