探索碳酸盐岩石溶解动力学和岩石矿物学在CO2注射中的影响
Javad Shokri1, Matthias Ruf2, Dongwon Lee2
1Department of Chemical Engineering, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
Environmental science & technology
|January 17, 2024
概括
破碎岩石中的地化学溶解速度远低于以前的想法,影响了地质二氧化碳储存模型. 流速和矿物学显著改变溶解模式和孔隙结构.
科学领域:
- 地质化学 地质化学
- 的媒体科学 的媒体科学
- 地下土壤工程是什么?
背景情况:
- 准确地化学溶解速率估计对于地表应用,如地质二氧化碳储存至关重要.
- 破碎的多孔介质表现出复杂的运输动态,引发了关于接口与批量溶解速率和尺度依赖性的问题.
- 了解这些过程对于可靠的地化学流动模拟至关重要.
研究的目的:
- 研究流速和矿物学对裂纹矩阵界面上的地化学溶解速率的影响.
- 将破裂多孔介质中的溶解率与批量实验中的溶解率进行比较.
- 分析流动力学对孔腔形态变化的影响.
主要方法:
- 在碳酸岩样本中注入碳酸水,其中有一个中央通道.
- 微型计算机断层扫描 (μCT) 在3.3μm空间分辨率下进行X射线成像,用于速率估计和形态分析.
- 控制流量变化和矿物学 (矿石,富含粘土的碳酸盐).
主要成果:
- 观察到的溶解率高达4个数量级低于批量实验结果.
- 流量率影响了断裂扩大:低速率导致不均的扩大,而高速率导致均的扩大.
- 安克里特在断裂表面上形成了高透性,高孔度的层,而不会显著改变溶解速率,与富含粘土的样本不同.
结论:
- 在破碎的多孔介质中,地化学溶解比在散装条件下要慢得多,因此需要修改模型方法.
- 流速和矿物学是控制溶解模式和地下环境中孔隙结构演变的关键因素.
- 这些发现对于提高地质二氧化碳储存和其他地下应用中的预测模型的准确性至关重要.
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