2010 state of knowledge: Beaufort Sea seabed geohazards associated with offshore hydrocarbon development

Blasco, Steve; Bennett, R; Brent, T A; Burton, M. G.; Campbell, Patrick; Carr, Erin; Covill, R; Dallimore, S. R.; Davies, E.R.; Hughes-Clarke, John E.; Issler, D R; Leonard, Lucinda J.; MacKillop, K; Mazzotti, S.; Patton, E; Rogers, Garry C.; Shearer, J; White, Michael P.

doi:10.4095/292616

Cited by 31 publications

(61 citation statements)

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“…comm., 2014), our trap-derived mass fluxes yield sedimentation rates of 0.1-0.3 mm yr À 1 due to lateral transport during winter. This range is consistent with the typical sedimentation rates over the slope of the Mackenzie Shelf (o 0.5 mm yr À 1 ) reported by Blasco et al (2013).…”

Section: Mooring Bsupporting

confidence: 87%

“…Together with previous studies in the area (e.g. Forest et al, 2008;O'Brien et al, 2011;Blasco et al, 2013), our work underscores that the shelf-break and upper slope area in the southeastern Beaufort Sea is active in terms of sediment mobilization at various time-scales. It varies on monthly to inter-annual time-scales in response to oceanographic processes (this study) and is linked at longer time scales (decades to centuries) with the dynamics of subsea permafrost and associated gas venting (Saint-Ange et al, 2014).…”

Section: Discussionsupporting

confidence: 56%

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Physical forcings and intense shelf–slope fluxes of particulate matter in the halocline waters of the Canadian Beaufort Sea during winter

Forest

Osborne

Fortier

et al. 2015

Continental Shelf Research

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Section: Mooring Bsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 56%

Physical forcings and intense shelf–slope fluxes of particulate matter in the halocline waters of the Canadian Beaufort Sea during winter

Forest

Osborne

Fortier

et al. 2015

Continental Shelf Research

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“…HughesClark, 2009;Shakhova et al, 2010;Blasco et al, 2010;. Unique geologic and hydro-geologic processes are also likely to occur as a consequence of such water and gas release.…”

Section: Rationale and Scientific Motivationmentioning

confidence: 99%

Overview of field operations during a 2013 research expedition to the southern Beaufort Sea on the RV Araon

Jin¹,

Riedel

Hong³

et al. 2015

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“…This velocity gradient is the highest observed gradient along all of the RV Araon multichannel seismic data acquired in 2013 and 2014. Earlier interpretations by Blasco et al (2013) and Batchelor et al (2013a) suggested that these sediments are glacial till and/or sand-rich (watersaturated) sediments. In comparison, sand-rich channels at equivalent or slightly deeper burial depths intersected further east of the Beaufort Sea margin show lower than average root-mean-square velocity values e.g.…”

Section: Mackenzie Trough Unconformitymentioning

confidence: 95%

“…A second objective of this study is to image the deeper structure of fluid-expulsion features that occur on the slope, previously imaged with high-resolution 3.5 kHz subbottom profiler data (e.g. Blasco et al, 2013;. The multichannel seismic data allow a time-to-depth conversion and definition of the source region of the fluid-expulsion features.…”

Section: Introductionmentioning

confidence: 99%

First results on velocity analyses of multichannel seismic data acquired with the icebreaker RV Araon across the southern Beaufort Sea, offshore Yukon

Riedel

Hong²,

Jin³

et al. 2016

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Abstract:One thousand two hundred twenty kilometres of multichannel seismic data were acquired in the Beaufort Sea in 2013 and 2014 to interpret shallow sedimentary structures associated with the upper Cenozoic Iperk and Shallow Bay depositional sequences. Seismic velocity analyses suggest a remarkably consistent regional velocity-depth trend on the slope within the upper 4 s two-way traveltime. A separate velocity trend was not defined beneath the shelf in this region, where data are influenced by the occurrence of permafrost. Deviations from this trend were noted at unconformities including an upper erosional unconformity.The seismic data in the Mackenzie Trough region suggest a different velocity-depth trend within the upper section and the region is marked by a large erosional unconformity, likely the base of the Shallow Bay sequence. Velocity analyses suggest the removal of up to 425 m of overburden; however, this is an overestimate of erosion as differential compaction from the glacial history has not yet been taken into account. In deeper water (>750 m) a bottom-simulating reflector is present, characterized by the occurrence of free gas and a low-velocity zone.Analyses of three fluid-expulsion features on the slope indicate that the Pokak fluid-expulsion feature and the Triple-Mound fluid-expulsion feature are linked to underlying anticline structures. A flat-topped fluidexpulsion feature at the flank of an equivalent anticline was also examined, but the occurrence of shallow gas creates a blank zone beneath this structure. Pronounced changes in the velocity-depth function at these fluid-expulsion features are linked to occurrence of free gas, and/or fluidized mud extrusions. Résumé :En 2013 et 2014, des données sismiques multicanal ont été acquises sur 1220 km dans la mer de Beaufort afin d'interpréter les structures sédimentaires à faible profondeur associées aux séquences sédimentaires d'Iperk et de Shallow Bay du Cénozoïque supérieur. Des analyses de la vitesse sismique indiquent une tendance vitesse-profondeur remarquablement constante à l'échelle régionale sous le talus pour les quatre premières secondes de temps de trajet double. Dans cette région, nous n'avons pas défini une tendance vitesse-profondeur distincte pour le secteur sous-jacent à la plate-forme continentale, un endroit où les données sont influencées par la présence de pergélisol. Des écarts par rapport à la tendance ont été relevés au niveau de discordances, notamment d'une discordance d'érosion supérieure.Dans la région de la cuvette de Mackenzie, les données sismiques révèlent une tendance vitesseprofondeur différente dans la partie supérieure de la coupe et la région est marquée par la présence d'une importante discordance d'érosion, qui correspond vraisemblablement à la base de la séquence de Shallow Bay. Les analyses de la vitesse laissent croire à la suppression de terrains de couverture sur une épaisseur pouvant atteindre 425 m. Cependant, il s'agit là d'une surestimation de l'importance de l'érosion, étant donné que la compac...

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2010 state of knowledge: Beaufort Sea seabed geohazards associated with offshore hydrocarbon development

Cited by 31 publications

References 0 publications

Physical forcings and intense shelf–slope fluxes of particulate matter in the halocline waters of the Canadian Beaufort Sea during winter

Physical forcings and intense shelf–slope fluxes of particulate matter in the halocline waters of the Canadian Beaufort Sea during winter

Overview of field operations during a 2013 research expedition to the southern Beaufort Sea on the RV Araon

First results on velocity analyses of multichannel seismic data acquired with the icebreaker RV Araon across the southern Beaufort Sea, offshore Yukon

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