CO2 在咸水层溶解的储存机制和动态特征,Energy & Fuels

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CO2 在咸水层溶解的储存机制和动态特征
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-02-14 , DOI: 10.1021/acs.energyfuels.2c03987
Hao Chen _{1,

2,

3} , Haizeng Yu ₃ , Bing Zhou _{1,

2} , Rui Wang _{1,

2} , Quanqi Dai _{1,

2} , Xinyu Qi ₃ , Lantewa Aliyu Lawan ₃ , Zafarullah Abro _{3,

4}

Affiliation

溶解度捕集是CO ₂地质封存中一种重要的封存方式，受温度、压力、盐度等多种因素影响。目前主要研究单一矿物(如纯水、NaCl、MgCl ₂ )溶液的溶解度，对实际储层条件下的动态溶解过程研究较少。本研究基于改进的实验方法，开展了油藏条件下的静态和动态溶解度实验。通过孔隙渗透率测量、扫描电镜等实验手段，揭示了CO _{2的动态变化规律及成因}溶解度得到澄清。结果表明，静态溶解度实验在短期、快速识别CO ₂溶解度影响因素规律方面更有优势，而动态溶解度实验在模拟实际CO ₂地质封存过程变化规律方面更准确。温度对溶解度最敏感，其次是压力，而盐度对溶解度几乎不受温度和压力的影响。_{油藏条件下，CO 2}的溶解度更接近动态平衡后的溶解度值（3.2/100 g），CO _{2的溶解度}呈现出“先下降、后上升、再平衡”的动态过程，在15天左右达到最低值，约为1.76/100 g。但随着反应时间的延长，溶解度值提高，最终在30天后逐渐饱和，最终达到平衡。平衡溶解度比静态溶解度值低5%左右，这是由于储集层条件下矿物溶解与沉淀的动态竞争，同时“化学滞留”和“残余捕集”起关键作用。

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Storage Mechanism and Dynamic Characteristics of CO2 Dissolution in Saline Aquifers

Solubility trapping is one important storage method in CO₂ geological sequestration, which is affected by many factors such as temperature, pressure, and salinity. At present, the solubility of single mineral (such as pure water, NaCl, MgCl₂) solution is mostly studied, and the dynamic dissolution process under actual reservoir conditions is less studied. In this study, based on the improved experimental method, we carried out static and dynamic solubility experiments under reservoir conditions. With pore permeability measurements, scanning electron microscopy, and other experimental means, the dynamic change rule and reason for CO₂ solubility were clarified. The results show that the static solubility experiment has more advantages in identifying the law of influencing factors of CO₂ solubility in the short term and quickly, and the dynamic solubility experiment is more accurate in simulating the actual CO₂ geological storage process change rule. Temperature is the most sensitive to solubility, followed by pressure, and salinity is almost unaffected by temperature and pressure for solubility. Under reservoir conditions, the solubility of CO₂ is closer to the solubility value (3.2/100 g) after dynamic equilibrium, and the solubility of CO₂ shows a dynamic process of “first decreasing, then increasing, and then balancing”, reaching the lowest at about 15 days, about 1.76/100 g. But with a longer reaction time, improving solubility values, eventually, it gradually becomes saturated after 30 days, and eventually reaches equilibrium. The equilibrium solubility is about 5% lower than the static solubility value, due to the dynamic competition between mineral dissolution and precipitation under reservoir conditions, and at the same time, “chemical retention” and “residual capture” play a key role.

更新日期：2023-02-14

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