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首页> 外文期刊>Natural resources research >A New Lithostratigraphic Framework for the Cretaceous Colorado Group in the Cold Lake Heavy Oil Area, East-Central Alberta, Canada
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A New Lithostratigraphic Framework for the Cretaceous Colorado Group in the Cold Lake Heavy Oil Area, East-Central Alberta, Canada

机译：加拿大东艾伯塔省中部冷湖重油区白垩纪科罗拉多组的新岩性地层学框架

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摘要

The Albian to Santonian Colorado Group in the heavy oil area of Cold Lake, east-central Alberta represents a relatively condensed section of shale-dominated sedimentation within the Western Interior Sea. These shales form the cap rock to the underlying Clearwater and Grand Rapids formations that are exploited for bitumen extraction. Two cores covering the entire Colorado Group provide a unique opportunity for establishment of a stratigraphic reference in an area that has received attention only for its heavy oil-bearing Mannville Group. Based on sedimentology, geochemistry, micropaleontology, nannofossils, and wireline log data, the Colorado Group was subdivided into the Joli Fou, Viking, Westgate, Fish Scales, Belle Fourche, Second White Specks, and Niobrara formations. The Niobrara Formation was subdivided further into the Verger Member, informal Cold Lake member, and First White Specks Member. Because of this region's small accommodation space and distance to sources of coarse clastic sediment, disconformities are indicated lithologically by bioclastic layers and missing biozones. Foraminiferal subzones revealed two erosional boundaries associated with the Viking Formation. Faunal and floral evidence coupled with wireline log correlations suggest that the Middle to Upper Turonian Carlile Formation, as described from southeastern Alberta, is missing. That extends the Middle Turonian to Coniacian unconformity, as recognized in central Saskatchewan, westwards into Alberta.
机译：中西部艾伯塔省中部冷湖重油区的Albian至Santonian Colorado组代表了西部内陆海域页岩为主的沉积的相对凝结部分。这些页岩形成了下层的Clearwater和Grand Rapids地层的盖岩，这些地层被用于沥青提取。覆盖整个科罗拉多集团的两个核心为在仅因其稠油含油曼维尔集团而受到关注的地区建立地层参考提供了独特的机会。根据沉积学，地球化学，微古生物学，纳米化石和电缆测井数据，科罗拉多组被细分为乔利富，维京，韦斯特盖特，鱼鳞，百丽富奇，第二白斑和尼奥布拉拉地层。 Niobrara组进一步细分为Verger成员，非正式Cold Lake成员和First White Specks成员。由于该区域的居住空间较小，并且距粗碎屑沉积物的来源距离较远，因此，生物碎屑层和缺失的生物带在岩性上显示出不整合。有孔虫亚带显示了与维京组有关的两个侵蚀边界。动物和花卉的证据，加上电缆测井的相关性表明，缺少阿尔伯塔省东南部描述的中至上突尼斯卡莱尔组。如在萨斯喀彻温省中部所公认的那样，这将中突厥人至不雅人的不整合面向西扩展到了艾伯塔省。

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