Paleofluid Flow, Fracturing and Reservoir Implications in dolostone reservoirs in foreland and intracratonic tectonic settings

前陆和克拉通内构造环境中白云岩储层的古流体流动、压裂和储层意义

• 批准号: RGPIN-2017-04570
• 负责人: AlAasm, Ihsan
• 金额: $ 1.6万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=709119
• 关键词: Paleofluid; Flow; Fracturing; Reservoir; Implications

Despite considerable research over the last two decades on the origin of diagenetic fluids involving dolomitization, the debate about the process/ mechanism of dolomite formation is still is ongoing, especially regarding timing of fluid flow and chemistry of these fluids and the extent to which massive dolostones formed in near surface environments as opposed to formation at variable burial depths by hydrothermal and burial processes. The present proposal is part of an ongoing research program, both conceptually and experimentally, on the chemistry, source(s) of diagenetic fluids and timing of fluid flow events in sedimentary basins. It is aimed to put special emphasis on fault and fracture diagenesis, because faults and fractures are often the primary conduits for diagenetic fluids, whether passively or actively. These fluids do not only result in fracture mineralization but may also induce important diagenetic modifications to the host carbonate rocks, such as dissolution, recrystallization and dolomitization. Quantification of the fluid flow using integrated field, structural, petrographic and geochemical tools can be also used to develop conceptual models for the spatial and temporal distribution and connectivity of reservoir porosity and permeability on a regional basinal scale. The proposed research program for the next 5 years will have the following objectives: (1) a better quantification of the main diagenetic events and their responsible originating fluids in sedimentary basins; (2) determination of the relationship between the fractures and deformational or tectonic events (i.e. fracture diagenesis); (3) geochemical simulation of fluid/rock interaction (e.g. using reactive transport modeling); (4) determination of patterns of paleo-fluid flow (e.g. numerical and geochemical modeling); (5) investigate the application of Mg-isotopes and clumped isotopes on source(s) for dolomitizing fluids and temperature-fluid composition relationship; and, (6) unravel the impact of diagenetic events porosity evolution. These objectives can be achieved through careful examination of textural parameters, mapping of regional and local distribution of diagenetic and structural components, geochemistry (stable and radiogenic isotope measurements, fluid inclusions), burial and thermal history curves and quantitative basin modeling techniques. Sampling from carbonate reservoirs and their outcrop analogs from different geologic settings (stable intracratonic areas vs. tectonically more active areas within the basin) will allow a better understanding and quantification of the origin, timing and spatial distribution of dolomites and other diagenetic phases within each setting. Comparative studies on paleo-fluid flow and diagenesis will also be carried out between the Western Canada Sedimentary Basin (WCSB), Michigan Basin and Middle East basins.

尽管在过去的二十年中，关于涉及白云岩的成岩流体的起源的大量研究仍在进行中，但有关白云石形成的过程/机制的争论仍在进行中，尤其是关于这些流体的流体流动和化学的时间和化学的时间，以及在近地面环境中与在多变的bur bur bur andss中形成的近地表面环境中的辩论，而该程度的众多范围是在近地表面环境中形成的。本提案在概念和实验上是关于沉积盆地中流体流动事件的化学，成岩流体的来源的持续研究计划的一部分。它的目的是特别强调断裂和骨折成岩作用，因为无论是被动还是积极的是，断层和断裂通常都是成岩液的主要管道。这些液体不仅会导致裂缝矿化，而且还可能引起对宿主碳酸盐岩石（例如溶解，重结晶和白云油酸化）的重要成岩化修饰。 使用集成场，结构，岩石学和地球化学工具对流体流量进行定量，还可以用于开发概念模型，以在区域层面上的空间和时间分布以及储层孔隙率和渗透率的连通性。未来5年的拟议研究计划将具有以下目标：（1）更好地量化主要的成岩化事件及其在沉积盆地中负责任的产生流体； （2）确定断裂与变形或构造事件之间的关系（即骨折成岩作用）； （3）流体/岩石相互作用的地球化学模拟（例如，使用反应性传输建模）； （4）测定古流动流的模式（例如数值和地球化学建模）； （5）研究MG - 同位素的应用和集成的同位素在白云岩流体和温度 - 流体组成关系上的应用； （6）揭开成岩成分事件孔隙率演变的影响。这些目标可以通过仔细检查纹理参数，成岩和结构成分的区域和局部分布，地球化学（稳定和放射性同位素测量，流体夹杂物），埋葬和热历史曲线以及定量盆地建模技术来实现。来自碳酸盐储层及其露头类似物的采样（盆地内的稳定内部区域与构造更活跃的区域）将可以更好地理解和量化每种环境中白云岩和其他基因段的定时和空间分布。关于古流动流和成岩作用的比较研究还将在加拿大西部沉积盆地（WCSB），密歇根州盆地和中东盆地之间进行。