The rifting that is complex subsidence history stated earlier has generated a mixture of stratigraphy,

The rifting that is complex subsidence history stated earlier has generated a mixture of stratigraphy,

Framework and timing conducive to hydrocarbon generation and entrapment (Bell and Campbell, 1990). To date, nonetheless, significant discoveries only have been found within a few industries ( e.g. Hibernia, Terra Nova, Whiterose) for the northern Jeanne d’Arc basin. Main reservoirs are situated in belated Jurassic and Early Cretaceous marine that is shallow fluvial sandstones deposited throughout the 2nd rift and postrift stages. Later Jurassic shales of this Egret member include a source that is marine-rich matured during subsequent burial inside the Belated Cretaceous and Tertiary. Traps had been created because of the mid- Cretaceous from rollover anticlines ( e.g. Hibernia framework) and rotated fault obstructs, and so they had been mostly preserved through the subsequent Avalon uplift and erosion.

Figure 6. Seismic reflection profile LE 85-4 (Keen and de Voogd, 1988), remigrated and coherency filtered by J. Hall and S. Deemer (individual interaction, 2001). Seismic perspectives identified are Au/A* (Oligocene and Top Cretaceous) and U (Tucholke et al., 1989). Basement types that are crustal defined by characteristic alterations in expression pattern.

Many research has focused in the Jeanne d’Arc basin as well as other water that is shallow regarding the Banking institutions. Just a couple of wells have been drilled in much much much deeper water. Nevertheless, the sediment circulation map (Figure 5a) indicates that significant thicknesses occur beneath many regions of the slope and rise bordering the Banks ( e.g. Southern Whale, Salar, Carson-Bonnition, Flemish Pass and Orphan basins). Recently, extra seismic research has been undertaken during these much much much deeper water basins to help assess its financial potential. Past analysis associated with the much deeper regions that are offshore made making use of a few local seismic pages gathered in the mid- 1980’s ( ag e.g. Keen and de Voogd, 1988; Tucholke et al., 1989). A far more current group of local pages (Figure 5) now runs this protection throughout the northern Newfoundland basin. The much much deeper water area of the LE85-4 profile is shown in Figure 6 (J. Hall and S. Deemer, individual interaction, 2001) and a quick portion of the current Ewing2000-3 profile (Louden and Lau, 2002) over the Carson basin in Figure 7. A few tilted basement fault obstructs is seen as much as 100 km seaward through the rack break. The very first is a block that is large with a few sodium address that divides the overseas part associated with Carson-Bonnition basin into shallower and deeper water parts. The deep-water area of thicker sediment and complex cellar framework may contain the most readily useful potential for hydrocarbons (Enachescu, 1992).

Figure 7. Reflection that is seismic Ewing 2000-3 across the exterior Carson-Bonnition basin showing cellar ridge with possible sodium that separates basin into internal (shallow) from outer (deep water) components.

Seismic perspectives identified are Au/A* and U, after Tucholke et al. (1989). Observe that these perspectives pinch out and end against basement and cannot be traced into shallower water.

Further seaward associated with the faulted cellar, a 100-km wide area exists the place where a prominent reflector (U) masks the underlying cellar. This reflector seems to end against a few elevated basement highs. Over the U-reflector, the The u _ A * reflector defines the Tertiary change between flat-lying and bottom present dominated depositional sequences. It isn’t specific in the event that U-reflector is related into the Avalon unconformity regarding the southern Banking institutions and/or the Early Cretaceous ?-reflector observed from the margin that is scotianFigure 4). The character associated with the basement that is relatively flat-lying this transitional area can also be uncertain. Present drilling and seismic outcomes suggest the clear presence of a broad area of serpentinized basement that is peridotite a conjugate establishing beneath the Iberia margin (Louden and Lau, 2002). A comparable model ended up being formerly proposed by Enachescu (1992) when it comes to Newfoundland basin. Feasible drilling objectives to resolve these problems have already been selected along Ewing that is profile 2000-2 the north the main basin (Figure 8). A leg that is drilling of Ocean Drilling Program is planned because of this work with July-Sept 2003.

Figure 8. Reflection that is seismic and location of proposed Ocean Drilling Program drilling web internet internet sites within the Newfoundland basin (Tucholke et al., 2002). Seismic perspectives Au and U are recognized as per Figure 7. For basic location map start to see the Ocean Drilling Program webpage (http: //www-odp. Html)

A very wide zone of thick sediment exists within Orphan basin to the senior sizzle quizzes northwest of Flemish Cap.

This region experienced episodes that are rifting might have extended in to the belated Cretaceous. The majority of the basin is underlain by highly thinned continental crust but its deep water has precluded drilling activity that is much. The gravity highs from the rack advantage (Figure 5b) shows a factor from gravity lows related to the majority of the other basins. It has been modeled by changing the reduced crust with mantle, suggesting the clear presence of a rift that is failed ended up being abandoned whenever continental breakup shifted further towards the northeast (Chian et al., 2001). A rather thick series of Tertiary sediment into the much much much much deeper water elements of Orphan basin suggests a predominance of post-rift in the place of syn-rift subsidence (Keen and Dehler, 1993).

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