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TitreModeling the occurrence of overpressures on the Scotian Shelf, offshore eastern Canada
AuteurMudford, B S
SourceJournal of Geophysical Research vol. 93, no. B7, 1988 p. 7845-7855, https://doi.org/10.1029/jb093ib07p07845
Année1988
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 39886
ÉditeurWiley-Blackwell
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1029/jb093ib07p07845
Mediapapier; en ligne; numérique
Formatspdf
ProvinceRégion extracotière de l'est
SNRC10N; 10O; 11B; 11C
Lat/Long OENS -61.0000 -58.0000 44.5000 43.0000
Sujetspressions du reservoir; puits; pressions interstitielles; champs de gaz naturel; roches sédimentaires; schistes; grès; diagraphie géophysique; kérogène; hydrocarbures; diagraphie de résistivité; méthodes statistiques; perméabilité; établissement de modèles; Champ de gaz de Venture ; Plate-Forme de Néo-écossaise; géophysique; combustibles fossiles; géomathématique; Tertiaire; Crétacé; Jurassique
Illustrationsformulae; charts; logs
Diffusé1988 01 01
Résumé(disponible en anglais seulement)
Many wells on the Scotian Shelf, offshore from Nova Scotia, have drilled into overpressured zones. In particular, the wells comprising the Venture gas field have all encountered overpressures at depths below 4.5 km. The characteristics of the overpressure zones in the Venture field vary in some important details from overpressured zones on the U.S. Gulf Coast. In the Venture field the shales in the overpressured zones are observed to be normally compacted and interbedded with layers of overpressured sandstones. This is in contrast to the Gulf Coast, where the shales in the overpressure zone are undercompacted. Resistivity logs, sonic logs, and bulk density logs all provide some indications of overpressures in the Venture field but are not as unequivocal indicators of overpressure as they are on the Gulf Coast. Theoretical investigations of the causes of overpressures in an environment such as the Venture field show that overpressures are unlikely to be caused by loading of sediments. The most probable cause of overpressures is recent and continuing fluid generation, which is related to the transformation of kerogen to hydrocarbons. Limits are placed on the average permeabilities and fluid generation rates which are required if overpressures are to be produced by fluid generation.
GEOSCAN ID126720