GEOSCAN, résultats de la recherche


TitreNew insights into the tectonostratigraphic evolution of the Labrador Margin
AuteurDickie, K; Keen, C E; Williams, G L; Dehler, S A
SourceProceedings of the 2010 Offshore Technology Conference; 2010, 15 pages
Séries alt.Secteur des sciences de la Terre, Contribution externe 20090366
RéunionOffshore Technology Conference; Houston; US; mai 3-6, 2010
ProvinceRégion extracotière de l'est
Lat/Long OENS-62.0000 -52.0000 59.0000 53.0000
Sujetsmarges continentales; marges continentales, atlantique; marges plaques; évolution tectonique; evolution de la croûte; zones tectonostratigraphiques; hydrocarbures; capacité de production d'hydrocarbures; tectonique; combustibles fossiles; stratigraphie; géophysique
Illustrationslocation maps; cross-sections; stratigraphic columns; seismic profiles
ProgrammeGéoscience en mer, Analyse de bassin et ressources géoscientifiques
Résumé(disponible en anglais seulement)
To support the renewed interest in the hydrocarbon potential of the Labrador Sea, we have completed a regional seismic interpretation and integrated this with new biostratigraphic data, based on analyses of palynomorphs from wells in the Hopedale and Saglek basins. By integrating the two data-sets, we have developed a modified model for the evolution of the Labrador Margin. Our results are summarized in a tectonostratigraphic chart, which displays new and consistent age control for the major lithostratigraphic units and relates their depositional history to tectonic forces and global sea-level. Although we have identified and dated six regional unconformities in the wells, we can recognize several others on the seismic data. The older unconformities are related to the tectonics of rifting and seafloor spreading, and may delineate the onset of different stages of the rift process. In the Paleocene-Early Eocene, another significant influence was the episodic volcanism due to the passage of the proto-Iceland hot spot to the north, and to a major change in spreading direction in the Labrador Sea. During the post-seafloor spreading stage the effects of mass wasting and slumping, and of paleoenvironmental controls on the stratigraphy were more pronounced. We discuss the petroleum potential of the Hopedale Basin in terms of the structures we see on the seismic data, and highlight the Bjarni Formation, which appears to contain the most likely source and reservoir rocks.