多相流程控制碳酸盐沉形态在CO2注入地下玄武岩的过程中
Tianxiao Shen1, Quin R S Miller2, Nabajit Lahiri2
1Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, United States.
Environmental science & technology
|September 16, 2025
概括
在玄武岩芯中对CO2水流的模拟揭示了流动动力学和孔隙结构如何控制碳酸盐结节的形成. 这项研究将计算流体动力学模型与地下水库中的真实世界结晶联系起来.
科学领域:
- 地质化学和地下科学
- 计算流体动力学 (CFD) 是一种计算流体动力学.
- 石油工程和碳封存 石油工程和碳封存
背景情况:
- 瓦卢拉基岩试验示范 (WBPD) 是第一个在基岩水库中进行超临界二氧化碳注入试验.
- 了解玄武岩的多相流动力学对于预测二氧化碳储存安全性和矿物沉至关重要.
- 之前的研究缺乏详细的孔尺度洞察力,了解二氧化碳与水的相互作用以及随后的基岩中碳酸盐的形成.
研究的目的:
- 用孔尺度模拟和实验数据研究玄武岩多相流动力学.
- 为了确定流量参数 (毛细血管数,水和) 对碳酸结节形成的影响.
- 将计算流体动力学 (CFD) 模型与在玄武岩试验床上观察到的注射后结晶行为联系起来.
主要方法:
- 孔尺度格子博尔茨曼法 (LBM) 在WBPD的核心样本上的CFD模拟.
- 集成微CT,光学显微镜,SEM,N2吸附和低场NMR用于孔隙结构和流体分析.
- 过渡状态理论的应用,以建模碳酸盐沉机制.
主要成果:
- 模拟显示了连接 (区域1) 和半隔离 (区域2) 囊泡中的明显的CO2 - 水接口分布.
- 1区的流量规则限制了小型碳酸盐沉物 (<35微米) 的大小.
- 在2区,大型碳酸盐结节 (0.2-2毫米) 的形成是由CO2-水接口和囊泡表面变化的相互作用控制的,为生长创造了有利的条件.
结论:
- 由形态学决定的局部水和和pH梯度驱动超和,有利于玄武岩囊中的碳酸盐生长.
- 该研究提出了碳酸盐沉的逐步机制,增强了基岩石质的地化学和反应性运输模型.
- 这项工作建立了后期CFD建模与在现实世界地下环境中观察到的注射后结晶之间的直接联系.
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