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: $ 2.19万
• 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: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=683433
• 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泥盆纪，志留纪，奥陶纪碳酸盐和休伦域的寒武纪砂岩中地层，近水平方向的白云油化床的性质和起源。 这些流体的流体流量和化学定时以及这些白云石床在近表面环境中形成的程度，而不是通过水热和埋葬过程在可变埋葬深度形成的情况下，是本研究的基础构成。这些目标将使用集成的核心，岩石学和地球化学工具来实现。安大略省石油和天然气存储库（OGSR）的核心设施库将用于提供Huron域内的核心样品，此外，当Bruce核站设施的核心外，还将在此研究中进行研究。当时发生了降解时，当石灰石（CACO3）逐渐更改为volomite（CACO3）为Olomite（CACO3）（CA（CA）（CA（CA（MGCO3）））。 可以通过广泛的地质和地球化学过程发生白云岩，包括：a）sabkha型，b）混合水含水层，c）渗流，d）埋葬压实和e）水热。 这些过程导致地层密度变化，可以改变基岩的物理特性，包括增加的孔隙率和渗透率。 从这个意义上讲，白云岩可以通过在岩性后创建可渗透途径以及适合碳氢化合物积累的局部地质结构的可能性来影响地下水系统的演变。