Sedimentation of Upper Triassic reservoirs in the Beryl Embayment: lacustrine sedimentation in a semi-arid environment

Dean, Kevin

doi:10.1144/0040581

Cited by 8 publications

(4 citation statements)

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“…Soft-sediment deformation, in the form of clastic dykes and fissures, are locally abundant. This facies is particularly well developed in the Middle to Upper Triassic in the Central North Sea and Beryl Embayment (Dean 1993;O'Donnell 1993) and locally within the Steinmergel-Keuper in Germany (Arp et al 2005). Lacustrine deposits at outcrop have been recorded by Tucker (1978), Wright (2000, 2002), defined by oolitic shoreline facies and wave-cut platforms, but outside of the North Sea Basin laminated black shales have not been identified.…”

Section: Perennial Lake and Marsh Depositsmentioning

confidence: 99%

Triassic palaeogeography and fluvial dispersal across the northwest European Basins

2009

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Triassic dryland fluvial systems occur infilling extensional and post-rift basins across northwest Europe. These systems were deposited by streams draining off the major basin margin catchments of Greenland, Fennoscandia, the Scottish Highlands and the remnant Variscan mountains. Fluvial drainage was dominantly endorheic in character, and terminated in playa, aeolian dune, sabkha or marsh settings. Whilst the ambient basin climate fluctuated through varying levels of aridity and humidity, the dispersal of sand into these basins was critically dependant on catchment run-off from the major, basin flanking regions. In the Early Triassic the Tethyan monsoon drove seasonal precipitation over the Variscan mountains which transported sediment northward into arid dune fields and playa. In addition, far-travelled fluvial systems supplied sediment from distant, wetter catchments. Through the Middle and Late Triassic the effects of the Tethyan monsoon apparently weakened, and sand-prone fluvial systems draining off the Variscan mountains were more limited in areal extent, but expanded during pluvial episodes. However, Greenland and Fennoscandia maintained sediment supply from the north, with perennial run-off from Fennoscandia able to maintain marshes and levels of vegetation cover not encountered elsewhere in the region and to episodically drive major exorheic drainage systems into the Tethys Sea. Published climatic simulations are consistent with these observations, which indicate that Greenland, and particularly Fennoscandia, had precipitation levels higher than the regions to the south with a positive precipitation: evaporation balance.

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Section: Perennial Lake and Marsh Depositsmentioning

confidence: 99%

Triassic palaeogeography and fluvial dispersal across the northwest European Basins

2009

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“…Triassic sediments were mainly deposited in five nonmarine environments: lacustrine shorefacies, mouth bar, offshore lacustrine, sand flat-playa complexes and fluvial (Dean, 1993). They can be divided into three formations: Teist, Lomvi and Lunde (Frostick et a]., 1992).…”

Section: Stratigraphy and Main Geological Eventsmentioning

confidence: 99%

Application of Multi-well Subsidence Analysis of the Beryl Embayment, Viking Graben, Northern North Sea

Dou

Turner

Scrutton

2010

Acta Geologica Sinica - English Edition

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The Beryl Embayment is situated at the south end of the North Viking Graben in the North Sea. Three sets of normal faults, with N‐S, NW‐SE and NE‐SW orientations, have been recognized in the Beryl Embayment. High‐resolution subsidence analysis of 73 wells, combined with some seismic data, has been used to document Middle to Late Jurassic subsidence patterns in this area. The high temporal resolution achieved (1 to 2 million years per data point) has also allowed an assessment to be made of temporal evolution of faults with different orientations, and a study made of how and when the East Shetland Fault was linked and controlled sedimentary facies distributions. The results indicate that the East Shetland Fault can be divided into northern and southern parts which were linked together during the Early‐Mid Oxfordian. The Mid‐Late Jurassic syn‐rift phase can be divided into four stages: minor active extension stage during the Bathonian‐Middle Callovian, early syn‐rotational stage during the Late Callovian‐Early‐Mid Oxfordian, syn‐rotational climax stage during the Late Oxfordian‐Early Volgian, and late syn‐rotational stage during the Mid‐Late Volgian. The results also show that there was a sequential variation of extension direction of active normal faults with different orientations, with an overall shift in the dominant orientation of active normal faults from N‐S in the Bathonian‐Middle Oxfordian, through NNW‐SSE in the Late Oxfordian‐Early Volgian (=N30°E), to NW‐SE (=N45°E) in the Mid‐Late Volgian.

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“…This study includes Units 1 to 4 of the 'Lewis Formation' of Knutson & Munro (1991). These sediments comprise sandstones and mudstones interpreted as lacustrine, lacustrine shoreface, playa/sandflat and fluvial deposits (Knutson & Munro 1991;Dean 1993;Bond 1997). Sedimentation took place in a semi-arid, continental basin within an extensional tectonic regime (Frostick et al 1992).…”

Section: Triassic Strata Studiedmentioning

confidence: 99%

Integrated whole-rock trace element geochemistry and heavy mineral chemistry studies; aids to the correlation of continental red-bed reservoirs in the Beryl Field, UK North Sea

Preston

Hartley

Hole

et al. 1998

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Correlating continental red-bed successions in the sub-surface is a common problem for the hydrocarbon industry. These successions are typically barren of fauna and often monotonous, leading to non-diagnostic wire-line log signatures. A high-resolution, high precision study of detrital garnet chemistry within Triassic reservoir sandstones from the Beryl Field of the North Sea failed to subdivide the sequence satisfactorily. However, the whole-rock concentrations of immobile trace elements such as Zr, Nb and Cr can be shown to be controlled primarily by the abundances of the heavy minerals zircon, rutile and chrome-spinel, respectively. The chemistry of detrital rutile and chrome spinel varies widely within any one sample, implying that the whole-rock concentrations of Nb and Cr are also a function of the chemistry of these heavy minerals. Having calibrated a type well with a detailed mineralogical and geochemical study, it was possible to correlate between wells using whole-rock geochemical cross-plots.

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Sedimentation of Upper Triassic reservoirs in the Beryl Embayment: lacustrine sedimentation in a semi-arid environment

Cited by 8 publications

References 0 publications

Triassic palaeogeography and fluvial dispersal across the northwest European Basins

Triassic palaeogeography and fluvial dispersal across the northwest European Basins

Application of Multi-well Subsidence Analysis of the Beryl Embayment, Viking Graben, Northern North Sea

Integrated whole-rock trace element geochemistry and heavy mineral chemistry studies; aids to the correlation of continental red-bed reservoirs in the Beryl Field, UK North Sea

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