方解石
大孔隙
分形维数
矿物学
介孔材料
多孔性
斜长石
长石
材料科学
水银孔隙仪
超临界流体
岩石物理学
地质学
多孔介质
化学工程
分形
化学
复合材料
催化作用
有机化学
数学分析
工程类
数学
生物化学
石英
作者
Xian Shi,Chunyan Xiao,Hongjian Ni,Qi Gao,Han Liu,Dianshi Xiao,Shu Jiang
标识
DOI:10.1016/j.egyr.2023.01.023
摘要
The effects of ScCO2 on pore structure should be investigated in order to properly apply supercritical carbon dioxide (ScCO2) fracturing on tight sandstone. ScCO2 treatment was applied to three sets of tight sandstone samples. The pore structure was characterized using a combination of high-pressure mercury intrusion porosimetry and nuclear magnetic resonance. Furthermore, the pore size distribution's multi-fractal dimensions were estimated. After SCCO2 treatment, the number of transitional pores decreased significantly, while the number of mesopores and macropores increased. At all scales, the fractal dimension characteristics indicate that pore structure gets more complicated and heterogeneous. Furthermore, due to their larger contact area, large pores have a higher fractal dimension than small pores. The accumulative pore volume of the calcite-rich group increases and a decreasing trend occurs for the calcite-rare group. The content of calcite sharply decreased while clay, feldspar, and plagioclase content have a slight drop after ScCO2 treatment, which affects the alternation of pore structure. Thus, the accumulative porosity volume and pore connectivity do not always increase after ScCO2 exposure because re-precipitation and fine migration can potentially clog pores and channels.
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