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首页> 外文期刊>KSCE journal of civil engineering >Experimental Investigation on Permeability Evolution of Limestone Caprock under Coupled THM Processes
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Experimental Investigation on Permeability Evolution of Limestone Caprock under Coupled THM Processes

机译：THM耦合作用下石灰岩盖层渗透率演化的实验研究

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摘要

To investigate the gas sealing capacity of limestone as cap rock for gas reservoir at different burial depths, triaxial compression coupled with permeability tests of limestone subjected to different confining pressures and temperatures were carried out using the improved MTS 815 test machine.During the tests, acoustic emission (AE) monitoring system was also employed to estimate the rock damage.Test results demonstrated a degradation of triaxial compression strength with the increase in temperature and decrease of confining pressure.An empirical equation for the peak stress was established considering confining pressure and temperature.Three different permeability evolution patterns of limestone samples can be proposed based on the experimental results under different coupled thermo-hydro-mechanical (THM) conditions.According to the spatial-temporal characteristics of AE signals, permeability evolution was highly related to the fracture growth and connection in limestone.Ultimately, the experimental results revealed that the permeability of limestone gradually decreased with the increasing confining pressure and temperature.In addition, an exponential relationship between initial permeability and confining pressure was established.
机译：为了研究不同埋深下作为储层盖岩的石灰岩的气密性，使用改进的MTS 815试验机进行了三轴压缩与石灰岩在不同围压和温度下的渗透性测试。发射（AE）监测系统也被用来估算岩石损伤。测试结果表明，随着温度的升高和围压的降低，三轴抗压强度会降低。考虑围压和温度，建立了峰值应力的经验方程。根据不同热-水力-机械耦合条件下的实验结果，可以提出三种不同的石灰岩样品渗透率演化规律。根据声发射信号的时空特征，渗透率演化与裂缝的发育和裂缝的形成密切相关。石灰岩的最终连接实验结果表明，随着围压和温度的升高，石灰岩的渗透率逐渐降低，并且建立了初始渗透率与围压的指数关系。

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  • 来源
    《KSCE journal of civil engineering》 |2019年第12期|5090-5097|共8页
  • 作者

  • 作者单位

    College of Water Resource and Hydropower Sichuan University Chengdu 610065 China;

    State Key Laboratory of Hydraulic and Mountain River Engineering Sichuan University Chengdu 610065 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    coupled THM processes; permeability; mechanics; caprock; limestone;

    机译：耦合的THM流程;渗透性机械师盖层石灰石;

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