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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=643649
• 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系、志留系、奥陶系碳酸盐岩和寒武系砂岩中层控、近水平定向的白云岩层的性质和成因。制约流体流动的时间和这些流体的化学成分，以及这些白云岩床在多大程度上是在近地表环境中形成的，而不是在不同埋藏深度的热液和埋藏过程中形成的，是本次调查的基本组成部分。这些目标将使用综合岩心、岩石学和地球化学工具来实现。安大略省石油和天然气储存库(OGSR)的核心设施库将用于提供休伦域内的钻探岩心样品，以及布鲁斯核电站设施的岩心样品。**当石灰石(CaCO3)逐渐变成白云石(Ca(MgCO3)2)时，白云石化作用就会发生。白云石化可以通过广泛的地质和地球化学作用发生，包括：a)萨布卡型，b)混合含水层，c)渗流回流，d)埋藏压实，e)热液。这些过程会导致地层密度的变化，从而改变基岩的物理性质，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作用后形成的可渗透通道和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。