Development and post-depositional deformation of a Middle Eocene deep-water sandy depositional system in the Sørvestsnaget Basin, SW Barents Sea

Safronova, P. A.; Andreassen, Karin; Laberg, Jan Sverre; Vorren, Tore O.

doi:10.1016/j.marpetgeo.2012.06.007

Cited by 13 publications

(7 citation statements)

References 62 publications

(116 reference statements)

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“…Interpretation of 3D seismic data supported by well 7216/11-1 S data has demonstrated that the reservoir interval (Tobis Member) underwent post-depositional sand remobilisation, and sandstone injections were formed (Safronova et al, 2012(Safronova et al, , 2014.…”

Section: Lithologymentioning

confidence: 91%

A revised lithostratigraphic scheme for the Eocene to Pleistocene succession on the Norwegian continental shelf

Eidvin¹,

Riis²,

Brekke³

et al. 2022

NJG

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Introduction and backgroundA formal lithostratigraphic nomenclature of the pre-Permian to the upper Miocene/lower Pliocene for the central and northern North Sea was published by Deegan & Scull (1977). A revision of the Cretaceous and Cenozoic parts of the nomenclature was established by Isaksen & Tonstad (1989). Dalland et al. (1988) introduced a lithostratigraphic nomenclature for the Triassic to Quaternary of the mid-and northern Norwegian continental shelf. A "Lithostratigraphy of the Paleogene-lower Neogene succession of the Danish North Sea" was published by Schiøler et al. (2007). Subsequently, Gradstein et al. (2010) have published an informal lithostratigraphic nomenclature for the Mesozoic and Cenozoic of the North Sea, Norwegian Sea, Barents Sea and Svalbard (stratigraphic database). However, they introduced no new formal lithostratigraphic units. The present publication presents a revision of the Eocene to Pleistocene lithostratigraphies of Isaksen & Tonstad (1989) and Dalland et al. (1988; see Figs. 1 and 2) for the Norwegian central and northern North Sea, the Norwegian Sea and the western part of the Barents Sea.When drilling exploration wells, the petroleum companies commonly sample the Eocene to Pleistocene sediments with drill cuttings. Generally, the post-Eocene deposits have been far less sampled and investigated than the older sediments, which have been the main target for hydrocarbon exploration. The sampling programme is usually considerably less dense than in the deeper sections, e.g., every ten metres compared to every three metres in reservoirs. Only a small number of wells have been sampled with sidewall cores and short conventional cores, and the number of cored shallow stratigraphic boreholes covering the Eocene to Pleistocene is limited. The conventional cores are used mainly for geotechnical investigations. Contracted biostratigraphical consultants usually execute routine investigations. However, the samples are commonly investigated with large spacing and limited effort

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Section: Lithologymentioning

confidence: 91%

A revised lithostratigraphic scheme for the Eocene to Pleistocene succession on the Norwegian continental shelf

Eidvin¹,

Riis²,

Brekke³

et al. 2022

NJG

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“…The seismic data were provided by the Norwegian Petroleum Directorate (NPD) and TGS/Spectrum. The 3D seismic data have an average interval velocity of 2.1 km/s and dominant frequency of 20 Hz for the studied succession, therefore, the vertical resolution is about 26 m (Safronova et al 2012). This interval velocity was used to convert fault displacement in the Sørvestsnaget's sub-basins.…”

Section: Methodsmentioning

confidence: 99%

“…Paleoenvironment: The supply of sediments during the middle to late Eocene formed sandy deep-water fans and are inferred to have been sourced from the Stappen High (Safronova et al, 2012). The N-S trending clinoforms are present mostly within Sub-basins B and C, with a possible extension into Sub-basin D (Fig.…”

Section: Middleupper Eocene Unitmentioning

confidence: 99%

Early to middle Cenozoic paleoenvironment and erosion estimates of the southwestern Barents Sea: Insights from a regional mass-balance approach

Lasabuda

Laberg

Knutsen³

et al. 2018

Marine and Petroleum Geology

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The Cenozoic pre-glacial development of the southwestern Barents Sea is discussed, with focus on the early to middle Cenozoic net erosion that was poorly constrained. From 2D and 3D seismic mapping, the western Barents Sea continental margin development shows a complex history of structural configuration of highs and basins related to the Greenland and Eurasian plate movement and subsequent seafloor spreading in the Norwegian-Greenland Sea. Our subdivision of the Sørvestsnaget Basin allows for a closer focus on the tectonostratigraphic development in an overall transtensional setting. To the west, the lower to middle Cenozoic sediments are observed to be systematically overlying the oceanic crust in the Lofoten Basin in accordance to the progressive seafloor's opening. Based on interpretation of five seismic units including sediment progradation (clinoforms) as well as lithology information from exploration wells, the paleoenvironments for the Paleocene, Eocene, Oligocene and Neogene periods were reconstructed. The mass-balance approach has then been used to quantify the corresponding erosion of the southwestern Barents Sea source area. The Stappen High, the Loppa High, and part of mainland Northern Norway are proposed as the key drainage areas covering a combined area of 191,500 to 334,000 km 2 , depending on the location of its eastern limit. Our result shows that an average net erosion of 858-1362 m and an average erosion rate of 0.014-0.021 m/k.y have characterized the Cenozoic pre-glacial period. The calculated sediment discharge is 8.7 x 10 6 t/y and the sediment yield is 26.2-45.7 t/km 2 /y. Comparison with present-day fluvial systems shows a similar rate of sediment discharge suggesting that our estimates are reasonable. The pre-glacial sedimentation rate is estimated to be 0.026-0.071 m/k.y, which is on average one order of magnitude lower than for the preceding glacial period characterizing this area.

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“…During the Eocene, erosion of uplifted areas in the east and north resulted in sediment transport south and westwards, with clastic deposition including sandy turbidites in the structural basins along the SW Barents Sea continental margin (Lasabuda et al, 2018b(Lasabuda et al, , 2018cSafronova et al, 2012Safronova et al, , 2014. As a result, a gradual shallowing into a more shallow water shelf is inferred during the Oligocene through Miocene (Eidvin et al, 2014;Ryseth et al, 2003).…”

Section: Database and Methodsmentioning

confidence: 99%

An Early Neogene—Early Quaternary Contourite Drift System on the SW Barents Sea Continental Margin, Norwegian Arctic

Rydningen

Høgseth

Lasabuda

et al. 2020

Geochem Geophys Geosyst

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Alongslope flowing ocean currents are important sediment transport agents on high-latitude continental margins at present as well as during past glacials and interglacials (e.g., Campbell & Mosher, 2016; Rebesco et al., 2014). Such currents, spatially and temporally variable, are both eroding the continental slope in areas of persistent flow strength and direction, often creating widespread unconformities, and leading to the deposition of extensive mound-shaped, elongated contourite drifts (Figure 1a) (Faugères et al., 1999; Stow et al., 1996). These sedimentary processes, however, have so far attracted less attention compared to subglacial transport and subsequent downslope processes such as debris flows and turbidity flows, from

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Development and post-depositional deformation of a Middle Eocene deep-water sandy depositional system in the Sørvestsnaget Basin, SW Barents Sea

Cited by 13 publications

References 62 publications

A revised lithostratigraphic scheme for the Eocene to Pleistocene succession on the Norwegian continental shelf

A revised lithostratigraphic scheme for the Eocene to Pleistocene succession on the Norwegian continental shelf

Early to middle Cenozoic paleoenvironment and erosion estimates of the southwestern Barents Sea: Insights from a regional mass-balance approach

An Early Neogene—Early Quaternary Contourite Drift System on the SW Barents Sea Continental Margin, Norwegian Arctic

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