本文以深部咸水层二氧化碳地质封存为背景，针对超临界压力二氧化碳和水在岩心中的驱替过程和运移规律进行了可视化研究。本文主要通过实验方法，利用核磁共振设备，得到了岩心的孔隙率、岩心中超临界压力二氧化碳水相对渗透率随饱和度变化曲线及不同时刻岩心中水的分布特征等。研究表明，用核磁测量得到的岩心孔隙率具有很高精确度，利用核磁共振得到横向弛豫时间乃图谱，可以有效分析有效孔隙率和可流动流体所占比例。通过观察不同注入比例时的切层图像，发现在注入比例为CO2：H2O=3：1（体积比）时在入口处出现了较显著的浮升力作用。
To address the climate change and reduce the emission of CO2, CO2 storage in the deep saline aquifer is one of the promising technologies. The visualization experimental system was set up to investigate the CO2 migration mechanism during the displacement of supercritical CO2 and water inside the core rock. From the experimental system, the experiment measured porosity, calculated the relative permeability-water saturation curve the water distribution will be achieved. The porosity can be measured accurately using MR technique. The fraction of effective porosity and movable fluid can be calculated, according to the T2 curve from MR. The MRI for core slice with the injection ratio of CO2:H2O=3:1 shows remarkable buoyancy effect.
参考文献
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