Upper Cretaceous and lower Tertiary chalks of the Albuskjell area, North Sea: Deposition in a slope and a base-of-slope environment

Watts, N. L.; Lapré, J. F.; Schijndel-Goester, F. S. van; Ford, A. B.

doi:10.1130/0091-7613(1980)8<217:ucaltc>2.0.co;2

Cited by 52 publications

(18 citation statements)

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“…Scholle et al 1998), the regional extent of the associated well-log signal suggests a basin-scale development, which is also typical of incipient hardgrounds in chalk outcrops (see Kennedy & Garrison 1975;Quine & Bosence 1991;Lasseur et al 2009). Moreover, nodular chalks, as well as incipient and mature hardgrounds at the base of the Ekofisk Formation, have also been described in coeval successions in the West Ekofisk, Tor and Albuskjell fields and onshore Denmark (Watts et al 1980;Kennedy 1987b;Surlyk 1997;Scholle et al 1998;Bailey et al 1999;Lottaroli & Catrullo 2000;Hart et al 2004;.…”

Section: Interpretation and Discussion Diagenetic And Depositional Momentioning

confidence: 95%

Characterization of dense zones within the Danian chalks of the Ekofisk Field, Norwegian North Sea

Gennaro

Wonham

Sælen

et al. 2013

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The Ekofisk Field is a giant field which has been producing at a high level for more than forty years and, since 1987, this production has taken place with the support of sea-water injection. The Danian-aged chalk deposits of the Ekofisk Formation and the Maastrichtian Tor Formation form the main reservoir units in the Ekofisk Field. The Ekofisk Formation principally consists of porous resedimented chalks intercalated with relatively thin and lower porosity beds, called dense zones. A multi-scale study of dense zones, from scanning electron microscopy to wells and seismic impedance data, has allowed the characterization and mapping of these deposits. Five main dense zone lithotypes have been identified: (1) argillaceous chalk; (2) chalk with abundant flint nodules; (3) chalk beds cemented with silica/nano-quartz; (4) calcite-cemented chalk; and (5) stylolitized chalk. The different types of dense zones tend to cluster in certain stratigraphic intervals, such as the EE and EM reservoir units at the base and in the middle part of the Ekofisk Formation. Dense zones have different mechanical properties compared to porous chalks and, depending on the connectivity of their fracture networks, they can act as preferential conduits or baffles for the reservoir fluids. An increased understanding of the distribution, characteristics and geological factors at the origin of the dense zones is fundamental to better define the reservoir architecture and ultimately identify unswept zones for future infill drilling targets.

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Section: Interpretation and Discussion Diagenetic And Depositional Momentioning

confidence: 95%

Characterization of dense zones within the Danian chalks of the Ekofisk Field, Norwegian North Sea

Gennaro

Wonham

Sælen

et al. 2013

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“…Such reworked deposits are traditionally referred to as allochthonous, in contrast to autochthonous (pelagic), chalk (Fig. 2; Watts et al , 1980; Hatton, 1986; Kennedy, 1987; Herrington et al , 1991).…”

Section: Introductionmentioning

confidence: 99%

The influence of tectonic regime on chalk deposition: examples of the sedimentary development and 3D‐seismic stratigraphy of the Chalk Group in the Netherlands offshore area

2005

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The sediments of the Upper Cretaceous to lower Palaeogene Chalk Group were deposited through a wide range of depositional processes. Chalk was originally formed by settlement of coccolithophorid skeletal remains from suspension in the water column, with bottom currents redistributing the sediment shortly after deposition. Locally, tilting of the sea‐floor resulted in mass‐movement of chalk at scales varying from decimetre‐thick turbidites to slumps and slide sheets that were up to hundreds of metres thick. Syn‐depositional tectonic activity, therefore, constituted an important control on chalk facies. To study this relation in more detail, a three‐dimensional (3D)‐seismic stratigraphical analysis was carried out, comparing two study areas that experienced contrasting syn‐depositional tectonic evolutions. The Vlieland offshore area, which underwent gradual subsidence and westward tilting during deposition of the Chalk Group, is characterised by parallel and continuous reflections thought to represent pelagic chalk deposits. In the Dutch Central Graben, which was tectonically inverted during the Late Cretaceous to early Palaeogene, discontinuous and irregular seismic reflections that indicate large‐scale reworking of sediment are found. The improved image quality of 3D‐ vs. 2D‐seismic data allowed us to study the detailed geometry of allochthonous chalk bodies and aided the identification and tracing of the often subtle intra‐Chalk Group unconformities, resulting in a subdivision of the Chalk Group into seven seismic sequences.

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“…Many different classification schemes and specific nomenclatures in former and recent studies exist for intra-chalk erosional surfaces which are influenced by slope instability in the North Sea (Watts et al 1980;Kennedy 1987;Taylor and Lapré 1987;Surlyk et al 2003; Van der Molen et al 2005;Back et al 2011). In this study, we use the generic term MTDs to describe relocated sediments caused by submarine slope failures.…”

Section: Methodology and Definition Of Mtdsmentioning

confidence: 99%

“…In seismic profiles, the internal structure of these depositional elements is typically chaotic due to deformed sediments preserved above a basal shear surface (Watts et al 1980;Kennedy 1987;Frey-Martínez et al 2005;Lee et al 2007;Bull et al 2009). The plane that defines the upslope margin of MTDs is referred to as headwall scarp (Bull et al 2009).…”

Section: Methodology and Definition Of Mtdsmentioning

confidence: 99%

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Mass-transport deposits and reservoir quality of Upper Cretaceous Chalk within the German Central Graben, North Sea

Arfai

Lutz

Franke

et al. 2015

Int J Earth Sci (Geol Rundsch)

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Upper Cretaceous and lower Tertiary chalks of the Albuskjell area, North Sea: Deposition in a slope and a base-of-slope environment

Cited by 52 publications

References 0 publications

Characterization of dense zones within the Danian chalks of the Ekofisk Field, Norwegian North Sea

Characterization of dense zones within the Danian chalks of the Ekofisk Field, Norwegian North Sea

The influence of tectonic regime on chalk deposition: examples of the sedimentary development and 3D‐seismic stratigraphy of the Chalk Group in the Netherlands offshore area

Mass-transport deposits and reservoir quality of Upper Cretaceous Chalk within the German Central Graben, North Sea

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