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Structural Interpretation and Investigation of the Displacement Gradients of the Normal Fault System beneath the Horda Platform, the northern North Sea
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Petroleum Engineering and Applied Geophysics.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

The North Sea basin is one of the best-studied areas in the world with respect to the structural and sedimentary architecture of rift zones. The Base Cretaceous Unconformity, which defines a mappable horizon at the transition from synrift to postrift sequences associated with the Jurassic–Cretaceous rift, is well known as a reference marker for both seismic and well log interpretations and covers most of the basin. This unconformity is interpreted at the locations of the Øygarden Fault Zone, the Troll Fault Block, the North Viking Graben, the Tampen Spur, the Snorre Fault Block, the Sogn Graben and the Horda Platform. The complexities of the unconformity have been established and vary with the structural and geographical position within the basin. However, as the Base Cretaceous Unconformity covers most of the northern North Sea, its structural time map, is used to derive the picture of post-structural framework of a rift basin and to locate essential structures in the deeper sections. Three main reflectors (Pre-Jurassic 1, Pre-Jurassic 2 and Top seismic basement) located beneath the Base Cretaceous Unconformity on the Horda Platform, and have been interpreted using 2D seismic reflection data. These three reflectors have been studied in order to investigate in detail the displacement gradients and possible linkage of the early fault system under the Horda Platform, and to evaluate their effect on the large-scale sediment architecture. A main reason to work on the structures under the Horda Platform is due to the fact that these structures are believed to have existed already in the early stages of the northern North Sea basin development. The extensional normal fault systems of both the Permo-Triassic and the Late Jurassic rifts are considered a key control on the geological structures and sedimentary architecture of the region as presently seen. The basin evolution related Permo-Triassic rifting is most pronounced on the eastern part of the Horda platform where its synrift geometry is obviously seen with the huge segment length and largest uplift explainable by a flexural stretching model. The rift axis is transferred to position at base of the Viking graben during the Late- Jurassic rifting with the smaller magnitude of extension than the Permo-Triassic as clearly seen by the less thickness of the synrift geometry. However, the structural evolution of normal faults and the basin architecture under the Horda Platform is particularly affected by the complex interaction of fault linkage, fault propagation, fault growth, and death of fault through times from the early stage to the final stage of the basin development. Apart from the effects of major tectonic controls, additionally, non-tectonic parameters, such as climate, sea or lake level changes, and differences in amount and type of sediment supply, should be taken into account to influence the stratigraphic and sedimentation patterns in the basin.

Place, publisher, year, edition, pages
Institutt for petroleumsteknologi og anvendt geofysikk , 2012. , 61 p.
Keyword [no]
ntnudaim:7596, MSG2 Petroleum Geosciences, Petroleum Geology
URN: urn:nbn:no:ntnu:diva-19211Local ID: ntnudaim:7596OAI: diva2:566505
Available from: 2012-11-08 Created: 2012-11-08

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