Multiple episodes of fluid flow in the SW Barents Sea (Loppa High) evidenced by gas flares, pockmarks and gas hydrate accumulation

Chand, Shyam; Thorsnes, Terje; Rise, Leif; Brunstad, Harald; Stoddart, Daniel; Bøe, Reidulv; Lågstad, Petter Arthur; Svolsbru, T.

doi:10.1016/j.epsl.2012.03.021

Cited by 97 publications

(81 citation statements)

References 30 publications

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“…Glacial unloading and rising seawater temperatures during the early deglaciation destabilized methane hydrate deposits, leading to free gas release through the seafloor and the formation of the pockmarks visible in the study area ( Fig. 2; Chand et al 2012;Nickel et al 2012;Pau et al 2014). During the deposition of Subunit IIc, Nonionellina labradorica reached peak abundance in all cores investigated, marking the base of Assemblage Zone B (Fig.…”

Section: Early Deglaciationmentioning

confidence: 99%

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Sedimentary environments in the south-western Barents Sea during the last deglaciation and the Holocene: a case study outside the Ingøydjupet trough

Pau

Hammer

2016

Polar Research

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Section: Early Deglaciationmentioning

confidence: 99%

“…This is attributed to the vicinity of this site to a pockmark (Fig. 2), where the Holocene sediment cover is likely to be reduced (Chand et al 2012;Pau et al 2014). …”

Section: Lithostratigraphymentioning

confidence: 99%

Sedimentary environments in the south-western Barents Sea during the last deglaciation and the Holocene: a case study outside the Ingøydjupet trough

Pau

Hammer

2016

Polar Research

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“…The flow mechanism can be triggered by the presence of stratigraphic boundaries, leaking faults and increase in seafloor temperature during fast deposition of glacio-marine sediments (Chand et al, 2012). Out of all these trigger mechanisms, the role of tectonism or faulting in hydrocarbon migration/leakage on continental margins is still poorly understood.…”

Section: Rationalementioning

confidence: 99%

Deep-seated faults and hydrocarbon leakage in the Snøhvit Gas Field, Hammerfest Basin, Southwestern Barents Sea

Mohammedyasin

Lippard

Omosanya

et al. 2016

Marine and Petroleum Geology

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High-quality 3D seismic data are used to analyze the history of fault growth and hydrocarbon leakage in the Snøhvit Field, southwestern Barents Sea. The aim of this work is to evaluate the role of tectonic fracturing as a mechanism driving fluid-flow in the study area. To achieve this aim, an integrated approach including seismic interpretation, multiple seismic attribute analysis, fault modeling and displacement analysis was used.The six major faults in the study area are dip-slip normal faults which are characterized by complex lateral and vertical segmentation. The three main episodes of fault reactivation interpreted were in late Jurassic (Kimmeridgian), early Cretaceous and Paleocene times. Fault reactivation in the study area is mainly through dip-linkage. Throw-distance plots of the representative faults also revealed along-strike linkage and multi-skewed C-type profiles. The throw profiles show that faults in the study area evolved through polycyclic activity involving both blind propagation, syn-sedimentary activity and that they have their maximum displacement at the reservoir zone. The expansion and growth indices provide evidence for coeval fault activity with sedimentation and interaction of the faults with a free surface during their evolution.

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“…Cold seep habitats were practically unknown to science prior to the first records on the Florida Escarpment in the Gulf of Mexico some 30 years ago (Paull et al, 1984). More recently, such special marine environments have been documented in a broad range of tectonic settings around the world's seas (Campbell et al, 2002;Levin, 2005;Campbell, 2006), including the margins of the Norwegian Sea and Barents Sea (Hovland & Svendsen, 2006;Chand et al, 2008Chand et al, , 2012Berndt et al, 2014). There are examples of extant carbonates associated with both hydrate (primarily methane-bearing hydrate) melting and sea-floor hydrocarbon seeps (Ritger et al, 1987;Sassen et al, 1993;MacDonald et al, 1994;Naehr et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Organic-walled microfossils and palynodebris in cold seep carbonate deposits: The Upper Jurassic–Lower Cretaceous Agardhfjellet Formation on Svalbard (Arctic Norway)

Dalseg¹,

Nakrem²,

Smelror³

2016

NJG

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This study gives the first detailed report of palynomorphs from Mesozoic cold hydrocarbon seep deposits. The organic-walled microfossils and palynodebris comprise ex situ fossil material in the seep deposits of the Upper Jurassic-Lower Cretaceous Agardhfjellet Formation, and consist of both specimens that originated during the time of deposition and a few fossils reworked from older strata. The palynomorphs from the Agardh fjellet Formation carbonate seep deposits in Central Spitsbergen, Svalbard, are better preserved than the palynological material in the shale deposits in the same formation. This is due to early authigenic precipitation of carbonate, which led to a relatively rapid cementation of the sediments, preventing flattening of the fossils. The Non-metric Multidimensional Scaling (NMDS) of the dinoflagellate cyst assemblages in the studied succession shows an age-specific trend, rather than being environmentally controlled, while the NMDS of the palynofacies shows that the content of palynodebris in the samples is more environmental-specific than age-specific.

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Multiple episodes of fluid flow in the SW Barents Sea (Loppa High) evidenced by gas flares, pockmarks and gas hydrate accumulation

Cited by 97 publications

References 30 publications

Sedimentary environments in the south-western Barents Sea during the last deglaciation and the Holocene: a case study outside the Ingøydjupet trough

Sedimentary environments in the south-western Barents Sea during the last deglaciation and the Holocene: a case study outside the Ingøydjupet trough

Deep-seated faults and hydrocarbon leakage in the Snøhvit Gas Field, Hammerfest Basin, Southwestern Barents Sea

Organic-walled microfossils and palynodebris in cold seep carbonate deposits: The Upper Jurassic–Lower Cretaceous Agardhfjellet Formation on Svalbard (Arctic Norway)

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