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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
Oil Families of the Western Canada Basin
ABSTRACT
The oil families of the Western Canada Basin have been elucidated from an extensive investigation of the geochemical properties of oils and source rocks. This paper focuses on the oils; the source rock data are published elsewhere (Creaney and Allan, 1990a, b). General geochemical characteristics and detailed sterane and terpane biomarker fingerprints of the oil families are presented. The families are derived from a number of source rocks ranging in age from Middle Devonian to Late Cretaceous. Maps of each oil family are also presented that show the extent of dispersion of oils from individual source rocks into the reservoir systems of the basin. The detailed understanding of the genetic relationships between individual oils and their source rocks readily explains the concentration of conventional reserves in Devonian and Cretaceous pools, and the massive concentration of heavy oils in Lower Cretaceous sands and porous subcropping formations.
RESUME
La distribution des reserves d'huile dans le bassin de l'Ouest Canadien a pu etre eclaircie grace a l'etude extensive des proprietes geochimiques de ces huiles et de leur roche mere respective. Cet article met l'accent sur les huiles, tandis que les donnees sur les roches meres seront publiees par ailleurs (Creaney et Allan, 1990a, b). Les characteristiques geochimiques d'ensemble et les empreintes detaillees des marqueurs biologiques sterane et terpane sont decrites. Les familles sont issues de roches meres dont l'age varie de Devonien Moyen a Cretace Superieur. Des cartes montrant l'etendue de la dispersion des huiles a partir des roches meres vers les systemes de reservoirs sont aussi presentees. La comprehension detaillee des rapports genetiques entre les differentes huiles et leur roche mere respective permet d'expliquer aisement la concentration des reserves conventionnelles dans les reservoirs Devonien et Cretace, ainsi que la concentration massive des huiles lourdes dans les gres Cretace Inferieur et dans certains pieges stratigraphiques.
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