The complex rifting and subsidence history stated earlier has generated a variety of stratigraphy,

November 21, 2020 by superch6

The complex rifting and subsidence history stated earlier has generated a variety of stratigraphy,

Timing and structure conducive to hydrocarbon generation and entrapment (Bell and Campbell, 1990). Thus far, but, significant discoveries only have been found within a few industries ( ag e.g. Hibernia, Terra Nova, Whiterose) regarding the Jeanne d’Arc that is northern basin. Main reservoirs can be found in belated Jurassic and Early Cretaceous marine that is shallow fluvial sandstones deposited throughout the 2nd rift and postrift stages. Later Jurassic shales associated with the Egret member include a marine-rich supply that 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, as well as had been mostly preserved through the Avalon that is subsequent uplift 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). raya dating 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 regarding the Jeanne d’Arc basin as well as other superficial water basins regarding the Banking institutions. Just a few wells have actually been drilled in much much deeper water. Nonetheless, the sediment circulation map (Figure 5a) implies that significant thicknesses occur beneath many regions of the increase and slope bordering the Banks ( ag e.g. Southern Whale, Salar, Carson-Bonnition, Flemish Pass and Orphan basins). Recently, extra seismic research has been undertaken within these much much deeper water basins to help expand assess its financial potential. Past analysis regarding the much much much deeper regions that are offshore made making use of a couple of local seismic pages gathered in the mid- 1980’s ( ag e.g. Keen and de Voogd, 1988; Tucholke et al., 1989). A far more present pair of local pages (Figure 5) now expands this protection throughout the north Newfoundland basin. The much 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 element of the current Ewing2000-3 profile (Louden and Lau, 2002) throughout the Carson basin in Figure 7. A group of tilted basement fault obstructs is seen as much as 100 kilometer seaward through the rack break. The foremost is a block that is large with a few sodium address that divides the overseas part associated with Carson-Bonnition basin into shallower and much much deeper water parts. The deep-water area of thicker sediment and complex cellar framework may contain the potential that is best for hydrocarbons (Enachescu, 1992).

Figure 7. Seismic expression profile Ewing 2000-3 over 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). Remember that these perspectives pinch out and end against basement and should not be traced into shallower water.

Further seaward associated with the faulted cellar, a 100-km wide area exists where a prominent reflector (U) masks the basement that is underlying. This reflector seems to terminate against a number of elevated cellar 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 particular in the event that U-reflector is related towards the Avalon unconformity of this southern Banking institutions and/or the Early Cretaceous ?-reflector observed from the Scotian margin (Figure 4). The character associated with the basement that is relatively flat-lying this transitional area can be uncertain. Current drilling and seismic outcomes suggest the clear presence of a wide area of serpentinized peridotite basement in a conjugate establishing beneath the Iberia margin (Louden and Lau, 2002). A model that is similar formerly proposed by Enachescu (1992) for the Newfoundland basin. Feasible drilling goals to resolve these problems have already been selected along Ewing that is profile 2000-2 the north an element of the basin (Figure 8). A leg that is drilling of Ocean Drilling Program is planned with this work with July-Sept 2003.

Figure 8. Reflection that is seismic and location of proposed Ocean Drilling Program drilling web web internet sites when you look at 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 website (http: //www-odp. Html)

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

This region experienced rifting episodes that could have extended to the belated Cretaceous. All of the basin is underlain by highly thinned continental crust but its deep water has precluded much drilling activity. The gravity highs linked to the shelf advantage (Figure 5b) shows a factor from gravity lows related to all 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 had been abandoned whenever continental breakup shifted further to your northeast (Chian et al., 2001). An extremely sequence that is thick of sediment when you look at the much much much much deeper water areas of Orphan basin suggests a predominance of post-rift in the place of syn-rift subsidence (Keen and Dehler, 1993).