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TitreSedimentology, stratigraphy, and hydrocarbon reservoir potential of the Lower Cretaceous Jackass Mountain Group, southern Nechako basin, Camelsfoot Range, BC - preliminary observations
AuteurGoodin, J R; Mustard, P S; Mahoney, J B; Haggart, J W
Source 2008, 1 feuille Extrait de l'adresse [] (2010 08 24)
Séries alt.Secteur des sciences de la Terre, Contribution externe 20070537
RéunionBritish Columbia Geological Survey Branch, Mineral Exploration Roundup; Vancouver; CA; janvier, 2008
Documentsite Web
Mediaen ligne; numérique
SNRC92I/12; 92I/13; 92J/09; 92J/10; 92J/15; 92J/16; 92O/01; 92O/02; 92P/04
Lat/Long OENS-122.6667 -121.8500 51.1500 50.6333
SujetsCrétacé inférieur; roches sédimentaires; grès; conglomérats; mudstones; faciès sédimentaires; structures sédimentaires; bassins sédimentaires; milieu sédimentaire; cônes sous-marins; sédiments marins; sédiments marins; hydrocarbures; capacité de production d'hydrocarbures; Bassin de Nechako ; Groupe de Jackass Mountain ; Bassin de Methow ; sédimentologie; combustibles fossiles; Crétacé; Mésozoïque
ProgrammeDendroctone du pin ponderosa, Réponse géoscientifique pour le dendroctone du pin ponderosa
Résumé(disponible en anglais seulement)
The Lower Cretaceous Jackass Mountain Group (JMG), exposed along the southern margin of the Chilcotin Plateau (south-central British Columbia), is a >2 km-thick succession of marine and non-marine siliciclastic sandstone, minor mudstone, and lesser conglomerate, ranging in age from Hauterivian/Barremian to Albian or younger. The JMG was deposited in the Jura-Cretaceous Methow Basin, and appears to trend northward, beneath Cenozoic basalts into the Nechako Basin, which is currently the focus of renewed interest for hydrocarbon potential. Previous studies have suggested that the JMG is comprised dominantly of turbidites deposited in submarine fan complexes. The southern part of the study area does contain very thick (>1500 m), repeated, massive sandstone turbidite successions, which are interpreted as being deposited in sub-wavebase marine fan complexes. North of this, turbidites, while present, commonly show evidence of reworking in environments above storm wavebase. The central and northern areas are dominated by extensive non-marine, fluvial trough cross-bedded sandstone and floodplain siltstone. The precise age of these nonmarine facies is presently unknown, but detrital zircon samples from fluvial sandstones in this facies will at least provide a maximum age, and palynology samples will hopefully provide more specific age constraints and other biostratigraphic information. These observations suggest that a continuous, nonmarine to marine succession is preserved in this area, which possibly spans Barremian to Albian-Cenomanian time. Thick and moderately well-sorted cross-stratified fluvial sandstone packages in the northern Camelsfoot Range represent a new potential hydrocarbon reservoir system, which may have had better original porosity and permeability characteristics than the less well-sorted massive sandstone turbidites common in the southern Camelsfoot Range. Extensive fluvial and shallow marine facies associations in the JMG also support the interpretation that the JMG continues northward into the subsurface and may comprise the strata previously termed "Skeena assemblage,” which have been interpreted as containing "the most significant petroleum plays" in the Nechako Basin. Ongoing geochronologic, geochemical, paleontologic, and porosity/permeability analyses will constrain basin evolution and reservoir suitability.