Sediment routing controls on CO2 mineralisation potential

沉积物路由对二氧化碳矿化潜力的控制

• 批准号: 2892630
• 金额: --
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2892630
• 关键词: Sediment; routing; controls; CO2; mineralisation

Geological storage of CO2 has the potential to decarbonise much energy production and heavy industry. The most secure mechanism for permanent trapping of CO2 is mineralisation. Its effectiveness depends on: (1) the reactivity of mineral grains to injected CO2, and (2) rock texture, which controls dispersal of injected CO2 and the grain surface area available for mineralisation. Saline aquifers are the most attractive targets for storing injected CO2 at industrial scale, but many saline aquifers lack data required to characterise their mineralisation potential.This project will use sediment routing concepts to develop a first-order predictive model of the mineralisation potential of sandstones, based on upstream-to-downstream trends in depositional grain size, sorting and mineralogical composition. These trends arise from selective deposition of coarse grain sizes and variations in the physico-chemical durability of different minerals during sediment transport. The grain sizes, sorting and mineralogy of sand deposited in different segments of a sediment routing system are primary controls on the sandstone textures and geochemical characteristics that develop during burial diagenesis, and thus on their mineralisation potential. The project will focus on feldspathic sandstones, which contain calcium- and potassium-rich feldspars that react with and trap injected CO2 by precipitation of carbonate and clay minerals. However, feldspar grains also break down more rapidly than quartz during transport - thus decreasing reactive mineral content and mineralisation potential.1) The project will characterise trends in grain size, sorting and mineralogy in a modern sediment routing system draining the feldspar-rich, granitic and gneissic Iberian Massif, Spain. The student will collect field data to develop a self-similarity-based depositional model for grain size, coupled to feldspar content evolution as a function of transport distance and climate.2) The resulting model will be tested and calibrated against an ancient sediment routing system with CO2 storage potential. The feldspathic Sherwood Sandstone records deposition in fluvial, aeolian and lacustrine segments of the "Budleighensis" sediment routing system, which spanned the Wessex, Worcester, Cheshire, East Irish Sea, Solway and Carlisle basins, UK. CO2 storage is planned or proposed in Sherwood Sandstone saline aquifers and/or depleted hydrocarbon reservoirs in these basins. Previous work implies that feldspar content in the sandstones decreases downsystem, from 20-50% in Wessex Basin to 5-8% in the Solway and Carlisle basins. The student will interpret seismic, well, core and outcrop data to document the sediment volumes, grain size characteristics and petrography of sandstones in the "Budleighensis" sediment routing system. Results will have specific applications to CO2 storage projects in the UK, and also to generic assessment of CO2 mineralisation potential in sedimentary basins globally.

二氧化碳的地质存储有可能使大量能源生产和重工业脱碳。永久捕获二氧化碳的最安全机制是矿化。它的有效性取决于：（1）矿物晶粒对注入的二氧化碳的反应性，（2）控制注射的二氧化碳的扩散和可用于矿化的谷物表面积。盐水含水层是在工业规模上储存二氧化碳的最吸引人的目标，但是许多盐水含水层缺乏表征其矿化潜力所需的数据。该项目将使用沉积物路由概念来开发基于上游到downstream gentream趋势的砂岩矿物质潜力的一阶预测模型，该模型是基于上流元素趋势的，基于沉积物元素大小和矿物质的构造和矿物质的构造。这些趋势是由粗粒大小的选择性沉积和在沉积物传输过程中不同矿物质的物理化学耐用性中的变化引起的。沉积在沉积物路由系统不同段的沙子的谷物尺寸，分类和矿物学是对砂岩质地和地球化学特征的主要控制，这些控制在埋葬成岩作用期间发展，因此是其矿化潜力。该项目将集中于长石砂岩，其中包含富含钙和钾的长石，这些砂岩与碳酸盐和粘土矿物的沉淀一起反应并捕获二氧化碳。但是，长石晶粒在运输过程中也比石英更快地分解 - 从而降低了反应性矿物质含量和矿化电位。1）该项目将表征现代沉积物路由系统中晶粒尺寸，分类和矿物学趋势的表征，从而消耗了富含Feldspar的富含Feldspar，花岗岩，花岗岩和片麻岩的iberian iberian massif，Spin。该学生将收集现场数据，以开发基于自相似性的晶粒尺寸沉积模型，并耦合到长石含量的演变，这是运输距离和气候的函数。2）2）将对具有CO2存储电位的古代沉积物路由系统进行测试和校准。 “ Budleighighensis”沉积物路由系统的Feldspathic Sherwood砂岩记录沉积在河流，风格和湖泊中，该系统跨越了Wessex，伍斯特，柴郡，柴郡，东爱尔兰海，索尔韦和卡莱尔斯盆地，英国。在舍伍德砂岩盐水含水层和/或这些盆地中耗尽的碳氢化合物储层中计划或提议二氧化碳储存。先前的工作表明，砂岩中的长石含量从Wessex盆地的20-50％降低到Solway和Carlisle盆地的5-8％。该学生将解释地震，核心和露头数据，以记录“ Budleighensis”沉积物路由系统中砂岩的沉积物量，晶粒尺寸特性和岩石学。结果将对英国的CO2存储项目以及全球沉积盆地的二氧化碳矿化潜力进行特定应用。