Bathymetrically controlled carbonate microfacies of an Upper Devonian (Frasnian) ramp and relationship to correlative reservoirs, western Alberta and northern British Columbia

上泥盆统（弗拉斯阶）坡道测深控制的碳酸盐微相及其与艾伯塔省西部和不列颠哥伦比亚省北部相关储层的关系

• 批准号: 469259-2014
• 负责人: Pratt, Brian
• 金额: $ 1.82万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=563387
• 关键词: Bathymetrically; controlled; carbonate; microfacies; Upper

Upper Devonian limestones, dolomites and shales of the Western Canada Sedimentary Basin, deposited some 375-380 million years ago, still host huge quantities of conventional and unconventional oil and gas resources. The basin was once a vast complex of shallow-water carbonate platforms and adjacent basins somewhat akin to the present-day Bahamas. The ocean lay to the northwest and west. Many subsurface reservoirs have been studied and compared to outcrop analogues in the Rocky Mountains which provide a three-dimensional view. Platform interiors consisted of shallow lagoons and tidal flats, while carbonate sand shoals and organic reefs formed along platform margins. Sediment was washed off the interiors and onto the adjacent slopes. Carbonate mud, clay, silt and enormous amounts of organic carbon accumulated in the deeper areas, subsequently becoming the hydrocarbon source rocks. One setting that has escaped detailed scrutiny is the ocean-facing ramp that developed when the topographic relief of the platforms decreased. Such rocks are fossiliferous limestones and shales. In one locality in the Willmore Wilderness Park, these strata, belonging to the Mount Hawk Formation, host spectacular reefs that once towered 25 m above the surrounding seafloor. This locality offers a unique opportunity to compare the components in the reefs versus the adjacent and overlying beds. The dataset consisting of fossil composition will enable determination of the evolving water depths on the ramp. This information will be applied to understand the role of bathymetry and sea level changes on subsurface carbonate platform margin architecture and accumulation in adjacent basins. Husky Energy Inc. is currently exploring and developing both conventional and unconventional resources, particularly shale gas, in correlative strata, and the outcrop dataset will provide a better understanding of the stratigraphic evolution, water-column productivity and reservoir development especially around these platforms. This dataset puts Husky at a competitive advantage and will guide planned exploration activities and drilling locations.

加拿大西部沉积盆地的上泥盆世石灰岩、灰岩和页岩沉积于约3.75 - 3.8亿年前，至今仍蕴藏着大量的常规和非常规油气资源。该盆地曾经是一个由浅水碳酸盐台地和邻近盆地组成的巨大复合体，有点类似于今天的巴哈马群岛。海洋在西北和西方。许多地下储层已被研究，并与落基山脉的露头类似物进行了比较，这些露头类似物提供了三维视图。台地内部由浅水泻湖和潮坪组成，而碳酸盐砂浅滩和生物礁则沿沿着台地边缘形成。沉积物被从内部冲刷到邻近的斜坡上。碳酸盐泥、粘土、粉砂和大量有机碳在深部聚集，成为烃源岩。一个没有被详细审查的设置是当平台地形起伏减少时开发的面向海洋的坡道。这些岩石是含钙的石灰岩和页岩。在Willmore荒野公园的一个地方，这些地层属于Mount Hawk Formation，拥有壮观的珊瑚礁，曾经高耸于周围海底25米以上。这个地方提供了一个独特的机会，比较组件的珊瑚礁与邻近和覆盖床。由化石组成的数据集将能够确定斜坡上不断变化的水深。这些信息将用于了解水深测量和海平面变化对邻近盆地的地下碳酸盐台地边缘结构和积累的作用。赫斯基能源公司目前正在勘探和开发相关地层中的常规和非常规资源，特别是页岩气，露头数据集将更好地了解地层演化、水柱生产力和储层开发，特别是在这些平台周围。该数据集使赫斯基处于竞争优势，并将指导计划的勘探活动和钻井位置。