深部盐水环境下砂岩力学及渗透特性试验研究

doi:10.13722/j.cnki.jrme.2021.0326

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摘要为研究深部盐水层CO2储存中不同盐水环境下砂岩的力学及渗透特性，采用常规三轴压缩、声发射监测和渗透试验相综合的方法，研究了不同盐水砂岩试样在不同围压下CO2渗透率、强度及变形特性的变化规律，并结合微观结构揭示不同盐水溶液对砂岩渗透及强度特性的作用机制。研究结果表明：不同溶液饱和砂岩试样的CO2渗透率、峰值强度、损伤阈值和弹性模量与干燥试样相比均有所降低。与纯水相比，5%NaCl和5%K2SO4浸泡的饱和砂岩试样CO2渗透率有所下降，5%K2SO4浸泡的饱和砂岩试样的峰值强度、损伤阈值和弹性模量则有所增加，而5%NaCl浸泡的饱和砂岩试样强度和变形参数的变化不是很明显。不同溶液浸泡下饱和砂岩试样的破坏模式有所区别，主要为盐水溶液浸泡后的砂岩试样具有更多的伴生裂纹。通过微观结构观察到不同溶液浸泡后的砂岩试样表面有明显溶蚀空洞，而盐水溶液浸泡的饱和试样表面有结晶，NaCl晶体在试样表面随机分布，K2SO4晶体在试样表面堆积分布。

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	杨圣奇1
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	许帅博2
	刘振2

关键词 ：岩石力学, 深部盐水环境, 砂岩, 力学特性, 渗透特性, 微观结构

Abstract：In order to study the mechanical and permeability characteristics of sandstone under different saline environments when CO2 is stored in deep saline layers，conventional triaxial compression，acoustic emission monitoring and permeability tests were adopted to investigate CO2 permeability，strength and deformation behaviors of sandstone specimens under different confining pressures，and the action mechanism of saline solution on the permeability and strength behaviors of sandstone specimens under different confining pressures was revealed by combining with the microstructure. The results show that the permeability，peak strength，damage threshold and elastic modulus of saturated sandstone specimens with different solutions are lower than those of dry sandstone specimens. Compared with the saturated specimens soaked in pure water，the permeability of the saturated sandstone specimens soaked in 5%NaCl or 5%K2SO4 is decreased，and the peak strength，damage threshold and elastic modulus of the saturated sandstone specimens soaked in 5%K2SO4 are increased while there are no obvious changes for the strength and deformation parameters of saturated sandstone specimens soaked in 5%NaCl. The failure modes of the saturated sandstone specimens soaked in different solutions are different，mainly resulted from that the sandstone specimens soaked in saline solutions have more associated cracks. Through observing the microscopic structure，it is found that there are erosion and dissolution holes on the surface of the sandstone specimens after soaking, and that there are crystals on the surface of the saturated specimens soaked in brine solutions. NaCl crystals are randomly distributed on the surface of the specimens，while K2SO4 crystals are accumulated on the surface of the specimens.

Key words： rock mechanics deep saline environment sandstone mechanical behavior permeability microstructure

引用本文:

杨圣奇1，2，许帅博2，刘振2. 深部盐水环境下砂岩力学及渗透特性试验研究[J]. 岩石力学与工程学报, 2022, 41(2): 292-304.
YANG Shengqi1，2，XU Shuaibo2，LIU Zhen2. Experimental study on mechanical and permeability behaviors of sandstone under deep saline environments. , 2022, 41(2): 292-304.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0326 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I2/292

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