Controls on Upper Jurassic sediment distribution in the Durward–Dauntless area, UK Blocks 21/11, 21/16

Stewart, Simon; Fraser, Stuart; Cartwright, Joe; Clark, James; Johnson, Howard D.

doi:10.1144/0050879

Cited by 17 publications

(10 citation statements)

References 41 publications

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“…a, b). The mechanisms of interpod development have been discussed by several workers and includes regional extension or salt dissolution (Hodgson et al ., ; Smith et al ., ; Clark et al ., ; Kane et al ., ; Mannie et al ., ). One of the key characteristics of interpods is that they are not strongly linked to sub‐salt normal faults (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…In many rift basins, such as the North Sea, evaporite rocks, including halite and gypsum, form part of the pre‐rift stratigraphy and can influence the structural and stratigraphic evolution of the rift (e.g. Hodgson et al ., ; Stewart et al ., ; Alves et al ., ; Hudec & Jackson, ; Marsh et al ., ; Duffy et al ., ; Lewis et al ., ). The evaporite units may fully or partially decouple the sub‐salt deformation from that in supra‐salt strata, giving rise to markedly different structural styles above and below the evaporite unit (Koyi et al ., ; Stewart et al ., , ; Withjack & Callaway, ; Richardson et al ., ; Duffy et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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Impact of normal faulting and pre‐rift salt tectonics on the structural style of salt‐influenced rifts: the Late Jurassic Norwegian Central Graben, North Sea

Gawthorpe

Rotevatn

et al. 2016

Basin Research

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Studies of salt‐influenced rift basins have focused on individual or basin‐scale fault system and/or salt‐related structure. In contrast, the large‐scale rift structure, namely rift segments and rift accommodation zones and the role of pre‐rift tectonics in controlling structural style and syn‐rift basin evolution have received less attention. The Norwegian Central Graben, comprises a complex network of sub‐salt normal faults and pre‐rift salt‐related structures that together influenced the structural style and evolution of the Late Jurassic rift. Beneath the halite‐rich, Permian Zechstein Supergroup, the rift can be divided into two major rift segments, each comprising rift margin and rift axis domains, separated by a rift‐wide accommodation zone – the Steinbit Accommodation Zone. Sub‐salt normal faults in the rift segments are generally larger, in terms of fault throw, length and spacing, than those in the accommodation zone. The pre‐rift structure varies laterally from sheet‐like units, with limited salt tectonics, through domains characterised by isolated salt diapirs, to a network of elongate salt walls with intervening minibasins. Analysis of the interactions between the sub‐salt normal fault network and the pre‐rift salt‐related structures reveals six types of syn‐rift depocentres. Increasing the throw and spacing of sub‐salt normal faults from rift segment to rift accommodation zone generally leads to simpler half‐graben geometries and an increase in the size and thickness of syn‐rift depocentres. In contrast, more complex pre‐rift salt tectonics increases the mechanical heterogeneity of the pre‐rift, leading to increased complexity of structural style. Along the rift margin, syn‐rift depocentres occur as interpods above salt walls and are generally unrelated to the relatively minor sub‐salt normal faults in this structural domain. Along the rift axis, deformation associated with large sub‐salt normal faults created coupled and decoupled supra‐salt faults. Tilting of the hanging wall associated with growth of the large normal faults along the rift axis also promoted a thin‐skinned, gravity‐driven deformation leading to a range of extensional and compressional structures affecting the syn‐rift interval. The Steinbit Accommodation Zone contains rift‐related structural styles that encompass elements seen along both the rift margin and axis. The wide variability in structural style and evolution of syn‐rift depocentres recognised in this study has implications for the geomorphological evolution of rifts, sediment routing systems and stratigraphic evolution in rifts that contain pre‐rift salt units.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of normal faulting and pre‐rift salt tectonics on the structural style of salt‐influenced rifts: the Late Jurassic Norwegian Central Graben, North Sea

Gawthorpe

Rotevatn

et al. 2016

Basin Research

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“…The GKA sediment record is understood 1,2,3,4 to be largely controlled by salt movement. In the Triassic, early halokinesis resulted in large-scale salt pillows upon which variable thicknesses of Smith Bank claystones were deposited.…”

Section: Geological Overviewmentioning

confidence: 99%

Fulmar Sandstones, Correcting Some Received Wisdoms in the Greater Kittiwake Area (North Sea)

Coghlan

McRae

2010

SPE EUROPEC/EAGE Annual Conference and Exhibition

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The Fulmar Formation Sandstones in the Central North Sea are a prolific oil and gas play with new developments still being added 35 years after the first discovery in 1975. Typically interpreted as shallow marine, shore-face sands, there is a pronounced halokinetic element to the distribution of the hydrocarbon accumulations.The Greater Kittiwake Area, GKA, covers several license blocks in quadrant 21. The Kittiwake oil field was developed standalone with a small platform and tanker export with first production in 1990. A satellite field, Mallard, was added in 1998. The fields and surrounding acreage, including several small Fulmar discoveries, were acquired from the original owners in 2003.Since then Mallard was redeveloped leading to a ten-fold increase in production. Also three Fulmar discoveries were tied-back -Gadwall, Goosander and Grouse. In addition to the production capacity boost, production uptimes were improved and there was sufficient confidence to install an export pipeline. Other satellite discoveries are under consideration as future tie-backs.There have been surprises along this journey that contradicted pre-development assumptions about Fulmar sandstone reservoirs. A key one relates to the unanticipated strength of the aquifer response in the 'new' satellite developments. This flew in the face of received wisdom about Fulmar reservoirs typically not experiencing aquifer drive. It challenges regional expectations about the prerequisite aquifer distribution and size for aquifer drive, also about levels of diagenesis in the water-leg.In GKA, the Fulmar formation often thins off-structure below seismic resolution -coupled with regional depositional models this is difficult to square with field data from which aquifer drive can be inferred unambiguously. Anticipating where aquifer influx will likely be experienced is important for future developments, as pressure maintenance by waterflood is otherwise required for such tie-backs bringing higher costs and complexity. * Previously Venture Production plc

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“…In the Central Graben and adjacent areas, including the West Central Shelf and southern South Viking Graben, rift structural style and syn‐rift stratigraphic architecture was influenced by the presence of mobile salt in the subsurface (e.g. Stewart & Clark, 1999; Stewart et al , 1999; Fraser et al , 2003).…”

Section: Stratigraphic and Palaeogeographic Contextmentioning

confidence: 99%

Quantitative analysis of net‐transgressive shoreline trajectories and stratigraphic architectures: mid‐to‐late Jurassic of the North Sea rift basin

et al. 2009

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This paper outlines the use of the shoreline trajectory concept to understand the controls on net‐transgressive reservoir distribution and architecture in the highly productive Middle and Late Jurassic plays in the North Sea. Two broad groups of regressive–transgressive sandstone tongue are identified, with distinctive geometries, architectures and values of net‐transgressive shoreline trajectory defined by the stacking arrangement of multiple tongues. Shoreface tongues were supplied by longshore‐transported, marine‐reworked sediment and are associated with low‐to‐moderate transgressive trajectories (typically <0.2°). These tongues have variable dip extents that decrease weakly as the angle of shoreline trajectory increases, relatively small thicknesses that increase weakly with the angle of transgressive trajectory, and partial or no overlap with underlying and overlying tongues down depositional dip. Deltaic‐to‐estuarine tongues were supplied directly by fluvial sediment and are associated with moderate‐to‐very high transgressive trajectories (typically >0.1°). These tongues have small dip extents, variable thicknesses that increase weakly with the angle of transgressive trajectory, and partial to full overlap with underlying and overlying tongues down depositional dip, although vertically stacked tongues are separated by thin mudstones over much of their extents. There is some overlap in geometry and stacking arrangement of these two groups of sandstone tongues. The temporal and spatial distribution of shoreface and deltaic‐to‐estuarine sandstone tongues reflects linked variations in tectonic subsidence and sediment routing within the evolving rift basin. Deltaic‐to‐estuarine tongues with moderate‐to‐very high transgressive trajectories were developed in rapidly subsiding fault‐bounded depocentres supplied directly by fluvial sediment, whereas shoreface tongues with low‐to‐moderate transgressive trajectories characterised slowly subsiding fault terraces and platforms that were distant from fluvial sediment supply routes. Thus, the evolving structural template of the mid‐to‐late Jurassic North Sea rift can be used to predict reservoir distribution and architecture via analysis of shoreline trajectory.

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Controls on Upper Jurassic sediment distribution in the Durward–Dauntless area, UK Blocks 21/11, 21/16

Cited by 17 publications

References 41 publications

Impact of normal faulting and pre‐rift salt tectonics on the structural style of salt‐influenced rifts: the Late Jurassic Norwegian Central Graben, North Sea

Impact of normal faulting and pre‐rift salt tectonics on the structural style of salt‐influenced rifts: the Late Jurassic Norwegian Central Graben, North Sea

Fulmar Sandstones, Correcting Some Received Wisdoms in the Greater Kittiwake Area (North Sea)

Quantitative analysis of net‐transgressive shoreline trajectories and stratigraphic architectures: mid‐to‐late Jurassic of the North Sea rift basin

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