在爱德华斯布朗多洛米特的孔网尺度上的异质性驱动的捕获
Nihal Darraj1, Sojwal Manoorkar2, Catherine Spurin3
1Department of Earth Science and Engineering, Imperial College London, London SW7 2AZ, U.K.
概括
地质构成中的毛细管屏障通过固定羽毛来增强二氧化碳的捕获. 这些由毛孔尺度异质性引起的障碍,减少可访问的毛孔体积并影响迁移途径,需要集成到大规模模型中.
科学领域:
- 地质碳储存 地质碳储存
- 孔尺度物理学的物理
- 储水库工程 储水库工程
背景情况:
- 剩余的二氧化碳捕获对于地质储存的稳定性至关重要,但在现场尺度上进行建模是具有挑战性的.
- 由毛孔尺度异质性和毛细管入口压力影响的毛细管捕获,显著影响二氧化碳羽毛迁移.
- 目前的连续尺度模型很难将微米至厘米尺度孔隙异质性对捕捉效率的影响整合起来.
研究的目的:
- 调查孔尺度异质性,特别是毛细血管屏障对二氧化碳捕获效率和羽毛迁移的影响.
- 量化毛孔连接和喉几何如何影响毛细血管进入压力和断开机制.
- 评估是否需要将孔尺度异质性效应纳入异质形成的高档模型.
主要方法:
- 在毛细血管主导的条件下 (Ca = 2.6 × 10^-7) 使用盐水和干进行了流量实验.
- 在12毫米×60毫米的岩石样本上获得了5.6微米的伏塞尔尺寸的时间分辨率的3D微型CT图像.
- 使用孔网分析和质体积/数量分析分析细分体积,以量化被困体积.
主要成果:
- 一个下游的低度区域起到了部分毛细血管屏障的作用,在decan注射过程中保持盐水和.
- 毛孔网络分析显示,连接性有限 (协调号 ~2),超过30%的毛孔由两个或更少的喉连接在一起.
- 毛细血管屏障显示出增强的捕获,移动阶段的位移微不足道,并增加了被捕的状腺体体积和数量.
结论:
- 毛细血管屏障显著增加了液体固定,同时减少了异质构成的可访问毛孔体积.
- 毛细血管屏障的存在会影响二氧化碳羽毛的迁移路径,从而增加捕获.
- 在异质构成中进行地质储存的升级模型必须捕捉毛孔尺度毛细血管屏障的影响,以进行准确的预测.
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