The Lower Cretaceous succession of the northwestern Barents Shelf: Onshore and offshore correlations

Grundvåg, Sten‐Andreas; Marín, Dora; Kairanov, Bereke; Śliwińska, Kasia K.; Nøhr‐Hansen, Henrik; Jelby, Mads E.; Escalona, Alejandro; Olaussen, Snorre

doi:10.1016/j.marpetgeo.2017.06.036

Cited by 60 publications

(94 citation statements)

References 69 publications

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“…The general SE ‐ SSE progradational direction of clinoforms seen on seismic data is similar to the palaeo‐current indicators in fluvial to deltaic Barremian sandstones exposed on the Svalbard archipelago and NE Greenland (Grundvåg et al, ). This suggests that the clinothems may represent distal equivalents of these onshore successions (e.g.…”

Section: Discussionsupporting

confidence: 68%

“…This suggests that the clinothems may represent distal equivalents of these onshore successions (e.g. Grundvåg et al, ; Midtkandal & Nystuen, ; Worsley, ). However, the clinothems in our study area may not correlate directly to those on Svalbard.…”

Section: Discussionmentioning

confidence: 99%

“…The latest Jurassic to Hauterivian reactivation phase generated local accommodation space, in the FSB and the western Bjarmeland Platform, which was filled, during the Barremian, by a SE prograding clinoform system (Serck et al, ). This prograding system had an inferred source area towards the NW/N of the study area, linked to regional uplift related to the High Arctic Large Igneous Province (HALIP) (Faleide, Vågnes, & Gudlaugsson, ; Grundvåg et al, ; Marín, Escalona, Grundvåg, Nøhr‐Hansen, & Kairanov, ; Midtkandal et al, ; Midtkandal & Nystuen, ; Senger, Tveranger, Ogata, Braathen, & Planke, ). Also, the Stappen High and Loppa High (Figure ) experienced uplift in the early Cretaceous (Anell, Faleide, & Braathen, ; Indrevær, Gabrielsen, & Faleide, ).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…The latest Hauterivian and Barremian clinoforms are overlain by the Base Kolmule Flooding surface (BKFS, Figures a and , ). BKFS is a significant regional flooding event which correlates to pro deltaic and open‐shelf deposits in the lower part of the Carolinefjellet Formation on the Svalbard Platform (Grundvåg et al, ).…”

Section: Seismic Observations and Interpretationsmentioning

confidence: 99%

“…The MRS represents peak regression of the entire progradational clinoform system in Sequences S1 and S2 (Grundvåg et al, ; Marin et al, , ). This is a complex surface in the north‐western FSB where transgressive ravinement appears to have modified an older erosional unconformity (the BrU, Figure ).…”

Section: Seismic Observations and Interpretationsmentioning

confidence: 99%

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Exploring the reservoir potential of Lower Cretaceous Clinoforms in the Fingerdjupet Subbasin, Norwegian Barents Sea

et al. 2019

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Sandy clinothems are of interest as hydrocarbon reservoirs but there is no proven, economic, clinothem reservoir in the Norwegian Barents Sea. We used high‐resolution, 2D and 3D seismic, including proprietary data, to identify a previously untested, Barremian, clinoform wedge in the Fingerdjupet Subbasin (FSB). Data from recent well 7322/7‐1 plus seismic have been used to characterize this wedge and older Lower Cretaceous clinoforms in the FSB. In the latest Hauterivian – early Barremian, during post‐rift tectonic quiescence, shelf‐edge clinoforms (foreset height > 150 m) prograded into an under‐filled basin. Increased sediment input was related to regional uplift of the hinterland (northern Barents Shelf). Early Barremian erosion in the north‐western FSB and mass wasting towards the SE were followed by deposition of delta‐scale (<80 m high), high‐angle (c. 8°) clinoform sets seaward of older shelf‐edge clinoforms. This may be the local expression of a regional, early Barremian, regressive event. By the close of the Barremian, clinoforms had prograded, within a narrow, elongate basin, across the FSB and towards the uplifted Loppa High. A seismic wedge of high‐angle (10–12°), low‐relief, delta‐scale (25–80 m) clinoform sets occurs between shelf‐edge clinoforms to the NW and the uplifted area to the SE. Well 7322/7‐1, positioned on a direct hydrocarbon indicator, <1 km NNW of the high‐angle, low‐relief, delta‐scale clinoforms, found upward coarsening siltstone‐cycles linked to relative sea‐level fluctuations on a marine shelf. Sand may have accumulated, offshore from the well, in high‐angle, low‐relief foresets of the delta‐scale clinothems (which are typical geometries elsewhere interpreted as ‘delta‐scale, sand‐prone subaqueous clinoforms’). Deposition was controlled by the paleosurface, storms and longshore currents on an otherwise mud‐dominated shelf. The study highlights challenges associated with exploration for sandstone reservoirs in seismic wedges on an outer shelf.

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Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Section: Geological Frameworkmentioning

confidence: 99%

Section: Seismic Observations and Interpretationsmentioning

confidence: 99%

Section: Seismic Observations and Interpretationsmentioning

confidence: 99%

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Exploring the reservoir potential of Lower Cretaceous Clinoforms in the Fingerdjupet Subbasin, Norwegian Barents Sea

et al. 2019

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Sedimentary deposits and bioturbation in an Early Cretaceous subarctic stormy greenhouse shelf environment

2023

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This study of the Aptian lower part of the Carolinefjellet Formation in Svalbard, Norwegian high Arctic, is based on well cores and outcrop section in the Adventdalen area of Spitsbergen and reports on the deposits and bioturbation structures of an ancient subpolar marine shelf from a well-known period of global greenhouse climate. The study documents the sedimentation conditions and benthic fauna activity on a warm-water aggrading shelf subject to harsh Arctic wave climate and eurybatic base-level changes, with episodic bottom incursions of cold polar water. Lithofacies associations and 38 observed ichnotaxa represent subenvironments ranging from offshore to lower shoreface and hosting the Cruziana ichnofacies in its distal to proximal expression, with a brief mid-Aptian encroachment of middle shoreface zone with a distal expression of the Skolithos ichnofacies. The ichnofacies are variously impoverished compared to their archetypes. The sediment bioturbation intensity varies, but similar lithofacies associations show a comparable intensity throughout the stratigraphic succession, which indicates an ichnofauna ecology controlled by the seafloor hydraulic regime and oxygenation, and thus mainly by the wave climate and relative sea-level changes. Sandstone tempestites indicate high-frequency storms, commonly exceeding the magnitude of largest modern hurricane events. The study confirms that a change in global climate mode, such as the Early Cretaceous warming, entails extreme weather conditions.

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Sylfjellet: a new outcrop of the Paleogene Van Mijenfjorden Group in Svalbard

Jochmann¹,

Augland

Lenz

et al. 2019

Arktos

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A hitherto unrecognized Paleogene outcrop has been discovered at Sylfjellet, a mountain located at the northern side of Isfjorden, Svalbard. The strata, which cover an area of 0.8 km 2 , have until now been assigned to the Lower Cretaceous succession of the Adventdalen Group. In this study, the Sylfjellet site was studied in detail to provide an updated structural and sedimentological description of strata and lithostratigraphy. The age and burial history of the investigated succession were constrained by absolute (U/PB) and relative dating methods in addition to vitrinite reflectance analyses of coal seams. The results show a Paleogene age of the deposits, which is supported by the occurrence of an angiosperm pollen grain, plant macrofossils, and a tephra layer of early Selandian age (61.53 Ma). The 250 m-thick succession of Sylfjellet is assigned to the Firkanten, Basilika and Grumantbyen formations. This succession unconformably overlies the Lower Cretaceous Helvetiafjellet Formation. Sylfjellet is incorporated into the West Spitsbergen Fold-and-Thrust Belt and interpreted to be a fourth structural outlier of the Van Mijenfjorden Group. Vitrinite reflectance data indicate that at least 2000 m overburden has been eroded above the Sylfjellet coal seams, and that maximum burial of the strata predates folding and thrusting in the area.

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The Lower Cretaceous succession of the northwestern Barents Shelf: Onshore and offshore correlations

Cited by 60 publications

References 69 publications

Exploring the reservoir potential of Lower Cretaceous Clinoforms in the Fingerdjupet Subbasin, Norwegian Barents Sea

Exploring the reservoir potential of Lower Cretaceous Clinoforms in the Fingerdjupet Subbasin, Norwegian Barents Sea

Sedimentary deposits and bioturbation in an Early Cretaceous subarctic stormy greenhouse shelf environment

Sylfjellet: a new outcrop of the Paleogene Van Mijenfjorden Group in Svalbard

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