基于划痕技术的CO2–水作用下页岩纹层强度软化规律

doi:10.3724/1000-6915.jrme.2024.0460

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摘要由于纹层厚度小，基于标准圆柱样品的单三轴等传统实验方法，难以反应纹层页岩强非均质性对力学性质的影响。选取青山口组纹层型页岩开展划痕和CO2浸泡实验，分析不同浸泡时间下的不同纹层强度软化规律。结果表明，随着浸泡时间的增加，划痕区域周围出现诱导裂缝，裂缝形状呈现“Y”字形。超临界CO2–水对富方解石层的影响最为显著。与原始页岩试样相比，随着浸泡时间的增加(1，2，3 d)，抗压强度分别下降了48.1%，57.3%和60.3%，弹性模量分别下降了39.3%，49.2%和50.5%。富黏土层的抗压强度和弹性模量随浸泡时间的增加先呈快速下降趋势，而后保持不变。石英/方解石层的抗压强度和弹性模量先降低后略有升高。该研究为页岩在超临界CO2–水相互作用下的软化行为提供了新的视角。

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	杨柳1
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	韩振川1
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	左建平1
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	刘合3
	孟思炜3

关键词 ：岩石力学, 页岩, 纹层厚度, 超临界CO2&ndash, 水&ndash, 岩相互作用, 划痕实验, 力学性质

Abstract：Due to the small thickness of the laminae，traditional experimental methods such as single triaxial based on standard cylindrical samples are difficult to respond to the effect of strong inhomogeneity of the laminated shale on the mechanical properties. In this paper，the laminated shale of the Qingshankou Formation was selected to conduct scratch and CO2 soaking experiments，and the softening pattern of different laminated strengths under different immersion times was analyzed. The results reveal that as the soaking time increases，induced cracks form around the scratched area，with the shape of a“Y”. Supercritical CO2-water had the most significant effect on calcite-rich lamina. Compared with the original shale specimens，the compressive strength decreased by 48.1%，57.3%，and 60.3%，and the elasticity modulus decreased by 39.3%，49.2% and 50.5%，respectively，with the increase of the soaking time(1，2，3 d). The compressive strength and elasticity modulus of the clay-rich lamina first showed a rapid decreasing trend with increasing soaking time and then remained constant. The compressive strength and elastic modulus of the quartz/calcite lamina first decreased and then slightly increased. This study provides a new perspective on the softening behavior of shale under supercritical CO2-water interaction.

Key words： rock mechanics shale lamina thickness supercritical CO2-water-rock interaction scratch test mechanical properties

引用本文:

杨柳1，2，韩振川1，2，左建平1，2，刘合3，孟思炜3. 基于划痕技术的CO2–水作用下页岩纹层强度软化规律[J]. 岩石力学与工程学报, 2025, 44(3): 557-571.
YANG Liu1，2，HAN Zhenchuan1，2，ZUO Jianping1，2，LIU He3，MENG Siwei3. Strength softening pattern of shale lamina under CO2-water interaction based on scratch technique. , 2025, 44(3): 557-571.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0460 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I3/557

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