一个孔尺度相场模型,用于CO2 - 流体 - 玄武岩相互作用
Wenchao Dou1, Changxi Geng2, Mian Lin1,3
1Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China.
ACS omega
|July 8, 2024
概括
玄武岩是一种岩.
科学领域:
- 地质化学 地质化学
- 地质地质地质地质地质地
- 材料科学 材料科学 材料科学
背景情况:
- 玄武岩形成对地质二氧化碳 (CO2) 储存有希望.
- 了解二氧化碳-流体-玄武岩相互作用对于安全的二氧化碳封存至关重要.
- 毛孔结构的演变会影响存储能力和完整性.
研究的目的:
- 在孔隙尺度上建模CO2 - 流体 - 玄武岩相互作用.
- 研究这些相互作用对玄武岩孔隙结构的影响.
- 评估温度和压力对选择地点的反应速度的影响.
主要方法:
- 开发了一个孔尺度相场模型.
- 该模型使用真实3D岩石图像模拟了CO2 - 流体 - 岩反应.
- 模拟分析了120天内的矿物溶解,降水和孔隙性变化.
主要成果:
- 二次矿物沉 (3.75%) 超过了矿物溶解 (2.01%).
- 孔隙性减少了1.74%,显著降低了孔隙连接性.
- 较高的温度和压力加快了反应速度,温度的影响更大.
结论:
- 在玄武岩中二氧化碳的封存导致孔隙性降低和孔隙结构改变.
- 高地热梯度有利于加速CO2-基岩反应.
- 该模型为优化二氧化碳地质储存地点选择提供了洞察力.
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