Dolomite Paleogenesis in the Huron Domain of South Ontario

南安大略省休伦地区的白云岩古生成

• 批准号: 503153-2016
• 负责人: AlAasm, Ihsan
• 金额: $ 4.74万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618974
• 关键词: Dolomite; Paleogenesis; Huron; Domain; South

The purpose of this project is to further investigate the nature and origin of stratabound, near- horizontally oriented dolomitized beds within Devonian, Silurian, Ordovician carbonates and Cambrian sandstones of the Huron Domain. Constraining timing of fluid flow and chemistry of these fluids and the extent to which these dolomite beds formed in near surface environments as opposed to formation at variable burial depths by hydrothermal and burial processes are fundemental componenet of this investigation. These objectives will be achieved using integrated core, petrographic and geochemical tools. The core facility Library of the Ontario Oil and Gas Repository (OGSR) will be used to provide drilled core samples from within the Huron Domain in addition to cores from Bruce Nuclear Station facility for the purpose of this investigation.Dolomitization occurs when limestone (CaCO3) is progressively changed to dolomite (Ca(MgCO3)2). Dolomitization can occur by a broad range of geologic and geochemical process including: a) sabkha type, b) mixed-water aquifer, c) seepage reflux, d) burial compaction, and e) hydrothermal. These processes lead to a change in formation density that can alter physical properties of the bedrock, including, increased porosity and permeability. In this sense, dolomitization can influence groundwater system evolution through the creation of permeable pathways following lithification and the possibility of localized geologic structure suitable for the accumulation of hydrocarbons.

该项目的目的是进一步研究休伦域泥盆纪、志留纪、奥陶纪碳酸盐岩和寒武纪砂岩内层控、近水平定向白云石化层的性质和起源。限制流体流动的时间和这些流体的化学性质，以及这些白云石层在近地表环境中形成的程度，而不是通过热液和埋藏过程在不同埋藏深度形成的白云石层，是本次研究的基本组成部分。这些目标将通过使用集成的岩心、岩石学和地球化学工具来实现。出于本次调查的目的，除了布鲁斯核电站设施的岩心外，安大略石油和天然气储存库 (OGSR) 的岩心设施图书馆还将用于提供休伦域内钻取的岩心样本。当石灰石 (CaCO3) 时，就会发生白云石化逐渐变为白云石 (Ca(MgCO3)2)。白云石化可以通过广泛的地质和地球化学过程发生，包括：a) sabkha 类型，b) 混合水含水层，c) 渗流回流，d) 埋藏压实，以及 e) 热液。这些过程导致地层密度发生变化，从而改变基岩的物理特性，包括增加孔隙度和渗透率。从这个意义上说，白云石化可以通过岩化后形成渗透通道以及适合碳氢化合物聚集的局部地质结构的可能性来影响地下水系统的演化。