scholarly journals Seismic Reprocessing Results From Gulf Canada Line 8047-08, Jeanne D'arc Basin, Newfoundland

1989 ◽  
Author(s):  
A Edwards
Keyword(s):  
Jeanne D'arc Basin ◽  
Jeanne D'arc ◽  
Canada Line

Variations in mixed-layer illite/smectite diagenesis in the rift and post-rift sediments of the Jeanne d'Arc Basin, Grand Banks offshore Newfoundland, Canada

2004 ◽  
Vol 41 (4) ◽  
pp. 401-429 ◽  
Author(s):  
Iftikhar A Abid ◽  
Reinhard Hesse ◽  
John D Harper
Keyword(s):  
Mixed Layer ◽  
Fine Fraction ◽  
Upper Jurassic ◽  
Grand Banks ◽  
Depth Profiles ◽  
Jeanne D'arc Basin ◽  
Central Ridge ◽  
Jeanne D'arc ◽  
Layer I ◽  
Mixed Layers

Mixed-layer illite/smectite (I/S) clays were analyzed from 22 deep exploration wells from the Jeanne d'Arc Basin on the Grand Banks offshore Newfoundland, the host of large commercial hydrocarbon accumulations discovered in the last two and a half decades. The fine fraction of the clays (<0.1 µm) consists mainly of mixed-layer I/S with minor amounts of kaolinite, illite, and chlorite. Smectite and (or) smectite-rich I/S clays were supplied to the Jeanne d'Arc Basin from Upper Jurassic to Tertiary times. Smectite-rich I/S clays occur only in shallow samples irrespective of geologic age. The proportion of illite in I/S mixed-layers, as well as the degree of ordering, increase with depth and temperature indicating that smectite-rich I/S clays have been progressively illitized in both rift and post-rift sediments of the Jeanne d'Arc Basin during burial. The transition from random to R1-ordered I/S occurs between subsurface depths of 1940 and 3720 m and crosses major stratigraphic boundaries. The transition from R1- to R3-ordered I/S generally occurs below 4000 m depth. Variable shapes of I/S depth profiles reflect the influence of temperature, fluid migration, subsidence history, basin structure, lithology, and salt diapirism on I/S diagenesis. Based on these variations, the basin can be subdivided into 4 regions with different illitization gradients. In the Southern Jeanne d'Ac Basin, advanced I/S diagenesis probably reflects uplift and denudation and (or) higher paleogeothermal gradients. Rapid increase of percent illite in I/S with depth in the Trans-Basinal Fault area is most likely controlled by upward flow of hot, K+-bearing fluids along faults. The migration of hydrocarbons probably followed the same pathways as the illitizing fluids. Delayed illitization in the Northern Jeanne d'Arc Basin and Central Ridge area reflects insufficient K+ supply because of a lack of detrital K-feldspar in the host sediment, the absence of faulting, and the presence of thick shale intervals. These findings show that I/S depth profiles may vary within the same sedimentary basin due to a variety of geological factors. Single wells generally cannot be considered representative for the basin as a whole.

scholarly journals Near-Surface Seismic Reflection Studies of the Jeanne d'Arc Basin, northeastern Grand Banks of Newfoundland

1989 ◽  
Author(s):  
D R Parrott ◽  
C F M Lewis ◽  
G V Sonnichsen ◽  
D C Mosher ◽  
M Douma ◽  
...  
Keyword(s):  
Seismic Reflection ◽  
Near Surface ◽  
Grand Banks ◽  
Jeanne D'arc Basin ◽  
Jeanne D'arc

A Hydrocarbon Charge Model of the Hibernia Drainage Area, Jeanne d'Arc Basin, Offshore Newfoundland

1994 ◽  
Vol 12 (4) ◽  
pp. 295-323
Author(s):  
Mark Williamson ◽  
Kevin Coflin ◽  
Scott King ◽  
Kevin Desroches ◽  
Phil Moir ◽  
...  
Keyword(s):  
Oil Field ◽  
Drainage Area ◽  
Secondary Migration ◽  
Jeanne D'arc Basin ◽  
The North ◽  
Charge Model ◽  
Jeanne D'arc ◽  
Hydrocarbon Charge ◽  
Volume Estimates ◽  
Migration Loss

An integration of map based and geological/geochemical modelling methodologies has enabled us to image the burial, subsidence, thermal and organic maturation histories of an area which, given its present and past structural geometry, drains into the Hibernia Oil Field. Our models indicate that the deeper parts of the Hibernia Drainage Area (HDA) contributed significant volumes of hydrocarbons, as early as 80–100 Ma, to the Hibernia structural culmination. The shallower portion of the HDA, such as the area vertically below pooled petroleum at Hibernia, has only been contributing hydrocarbons during the last 30–40 Ma. Translation of the modelled maturation history into volumetric estimates of generated, expelled and migrated oil within the area is accomplished assuming a 20% saturation threshold prior to hydrocarbon flow from the source to the reservoir/carrier system. Secondary Migration loss is estimated through assuming a reservoir/carrier-wide residual saturation of 2%. Our volume estimates suggest that the defined HDA was unable to provide sufficient charge volumes to fill the Hibernia structure and that additional charge must have been available from a drainage area to the north across the Nautilus fault. Extrapolation of HDA volumes throughout specifically defined play areas and the broader Jeanne d'Arc Basin suggests that, after accounting for secondary migration loss and assuming 30% recovery efficiency, some 2,015 106m3 (12,650 Mmbbls) of oil remains to be discovered. Our models do not account for losses due to biodegradation processes. Although this is not thought to be significant within the HDA, it will reduce basin-wide resources estimates and requires further study.

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