Sedimentary basins and petroleum systems offshore Newfoundland and Labrador

DeSilva, N.R.

doi:10.1144/0050501

Cited by 11 publications

(7 citation statements)

References 16 publications

(11 reference statements)

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“…The ridges are considered to be extrusive volcanic edifices which were subsequently draped with sedimentary rocks until finally being overstepped by sediment in Eocene time (Scrutton and Bentley, 1988). The stratigraphic control does not allow them to be dated accurately but they may be of Early Cretaceous age, when there was also significant igneous activity in the Porcupine Basin and on the Labrador Margin (Scrutton and Bentley, 1988;Tate and Dobson, 1988;Balkwill, 1987;DeSilva, 1999). Although the seismically-imaged ridges appear extrusive, modelling by Scrutton and Bentley (1988) indicated that the magnetic anomalies are best explained by a combination of the extrusive units and underlying intrusions, presumably lying along the fissures through which the igneous rocks were emplaced.…”

Section: Rockall Basinmentioning

confidence: 99%

Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

2010

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A new 3D lithospheric model has been constructed using high-resolution gravity data from the Irish National Seabed Survey. The sedimentary component of the model incorporated density variations due to laterally varying overcompaction associated with Cenozoic denudation. After optimisation based on gravity inversion, regional crustal thickness variations were defined which are in reasonable agreement with the results of wide-angle seismic experiments. High crustal extension factors (β>5) characterise the deeper parts of the Rockall and Porcupine basins and in places the model indicates extreme stretching (β>10) beneath these basins. This could be because of instability in the gravity inversion, although other recent investigations have independently suggested similarly high extension factors. In contrast, the Hatton Basin is characterised by an apparent extension factor of about 2. The modelling resolves a pattern of NE-to NNE-trending local Mesozoic basins on the margins of the Rockall Trough, helping to delineate structures that were previously only sparsely sampled by seismic surveys. It appears possible that rifts with similar trends underlie the volcanic rocks which obscure the deeper parts of the Hatton Basin. The linear trends of the basins to the south and east of Ireland are interpreted to have been inherited from a basement fabric that was initially established during the late Precambrian assembly of this basement and subsequently subjected to Caledonian and Variscan reactivation. Magnetic modelling indicates that the variations in the thickness of the crystalline crust predicted by the gravity models can explain the regional magnetic anomaly patterns over the Rockall and Porcupine basins, but that significant additional magnetic material (probably igneous rocks of both Palaeogene and Cretaceous ages) is required to explain the anomalies in the Hatton Basin region. The magnetic signature of the Rockall Basin is distinctly different to that over the basement (of similar apparent thickness) formed during mid Cretaceous (C34N) opening of the ocean basin to the south. This is an impediment to hypotheses that invoke mid Cretaceous sea-floor spreading rather than intracontinental rifting to explain the development of the basin. The exception is in the extreme south of the basin where the volcanism associated with the Barra Volcanic Ridges combined with indications of relatively strong lithosphere could be evidence of incipient ocean opening.

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Section: Rockall Basinmentioning

confidence: 99%

Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

2010

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“…Most of the sedimentary basins underlying the margins of the North Atlantic contain discovered or producing oil and gas fields or contain potential hydrocarbon source rocks (Butterworth, Holba, Hertig, Hughes, & Atkinson, 1999;DeSilva, 1999;Roberts et al, 1999;Spencer, Birkeland, Knag, & Fredsted, 1999;Williams et al, 1999). A pre-rift continental refit of the circum North Atlantic region for the Mesozoic, before the opening of the North Atlantic Ocean (e.g.…”

Section: Mesozoicmentioning

confidence: 99%

The geology of the UK Hatton-Rockall margin

Hitchen

2004

Marine and Petroleum Geology

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“…The Cartwright Formation is a lateral equivalent to the Gudrid Member and is interpreted to comprise submarine sandstones. The Gudrid Sandstone is interpreted to represent redeposited eroded material from the Markland Delta (DeSilva, 1999).…”

Section: O F F S H O R E / O T Cmentioning

confidence: 99%

“…The top of the Kenamu Formation is characterized by fine-grained sandstones of the Lief Member. The Leif Member is interpreted as a shallow-marine sandstone deposited toward the latter stages of seafloor spreading (DeSilva, 1999;Chalmers and Pulvertaft, 2001).…”

Section: O F F S H O R E / O T Cmentioning

confidence: 99%

Understanding potential pressure regimes in undrilled Labrador deep water by use of global analogues

Green¹,

O’Connor²,

Edwards³

et al. 2014

The Leading Edge

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In recent years, new deepwater seismic-based exploration work has resulted in the revision of existing basin boundaries and identification of new, potentially oil-bearing basins in the deepwater Labrador region. The petroleum potential in this deepwater area has also been encouraged by the identification of slick and seepage locations using 2D seismic data and satellite imagery. The importance is that surface slicks possibly are related to subsurface hydrocarbon migration. Thus, all recent data collated together show strong evidence for an active petroleum system in deep water. Many of the wells in shallow water have been drilled with low mud weights, suggestive of low pore pressures. However, where thick shale packages are present, significant overpressure is observed by significant kicks. Clearly, there is a close association between thick (and deep) shale packages and high pore pressure. Thus, one of the key risks in developing the deepwater potential is to understand the pressure regime. The success of this approach has been highlighted recently by successful discoveries such as

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Sedimentary basins and petroleum systems offshore Newfoundland and Labrador

Abstract: The sedimentary basins offshore Newfoundland and Labrador include those related to the opening and closing of the Palaeo-Atlantic (Iapetus) Ocean and those formed during the opening of the present Atlantic Ocean.

Cited by 11 publications

References 16 publications

Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

Three-dimensional gravity and magnetic modelling of the Irish sector of the NE Atlantic margin

The geology of the UK Hatton-Rockall margin

Understanding potential pressure regimes in undrilled Labrador deep water by use of global analogues

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