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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
The Role of Fault Interaction and Linkage in Controlling Synrift
Stratigraphic Sequences: Late Jurassic, Statfjord East Area, Northern North Sea 1
2Department of Geology and Geophysics, University of Edinburgh, Grant Institute, The King's Buildings, West Mains Road, Edinburgh EH9 3JW, Scotland, United Kingdom; e-mail: [email protected]; [email protected]
Seismic
interpretation was undertaken using Schlumberger GeoQuest IESX
software at facilities in Edinburgh supported by the Centre for Marine and Petroleum
Technology, Norsk Hydro, Shell Expro, and Esso (UK) Ltd. We thank Gunn Mangerud and Pl
Skott for their support and efforts in releasing data; Randi Jordan and Rolf Helland for
help with well data; and Anker Berge, Kjell-Owe Hger, Cai Puigdefbregas, Arvid
N¿ttvedt, Tom Dreyer, Roald Færseth, Anne Otelie Eide, Gunn Mangerud, Pl Skott, Sarah
Prosser, Paul Milner, Patience Cowie, Sarah Davies, Sanjeev Gupta, Aileen McLeod, and Jon
Turner for discussions. Bulletin reviewers Bruce Trudgill, Manuel Willemse, and Al
Lacazette provided very helpful reviews; Juan Contreras, Patience Cowie, and Simon
Kattenhorn provided additional helpful comments. Gerard White assisted with figures and
Chung-Lun Lau provided computer support.
ABSTRACT
Examination of well-constrained three-dimensional seismic
data demonstrates the role of
fault interaction and linkage in controlling the nature of synrift sequences on the
hanging wall of the Statfjord East fault, a typical Late Jurassic structure in the
northern North Sea Brent province. Al though now a single fault, the Statfjord East fault
originally consisted of several en echelon segments, each of which defined individual
subbasins. Structural and stratigraphic evidence, both along and across fault strike,
indicates that the fault resulted from segment propagation, interaction, and linkage.
Facies architecture, thickness variations, and the internal character of synrift
formations are temporally and spatially related to the subbasin geometry. Variations in
displacement along the fault segments exhibit characteristics of interacting en echelon
faults, including anomalous displacement gradients in regions of segment overlap. We
attribute the observed shifts in depocenters to local enhancement of displacement rates,
resulting from the interaction of neighboring fault segments. The results have
far-reaching consequences for synrift plays in the northern North Sea because they imply
that only from the perspective of fault growth and linkage can the Late Jurassic structure
and stratigraphy be fully understood.
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