低渗透岩石渗透特性测试及渗流应力耦合实验研究

项目名称： 低渗透岩石渗透特性测试及渗流应力耦合实验研究

项目编号： No.11272113

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 王环玲

作者单位： 河海大学

项目金额： 90万元

中文摘要： 低渗透岩石是地下石油和天然气储存、CO2储存、核废料处置的主要介质和地质环境，低渗透岩石的渗透特性测试以及渗流应力耦合特性研究是目前岩体力学研究中的热点和难点问题，也是亟待解决的前沿科学问题。研究工作以典型低渗透岩石为研究对象，通过实验测试方法研究，提出不同层级低渗透岩石压力脉冲法测试的阈值，推求不同层级低渗透岩石渗透率表达方法；通过气体脉冲压力渗流实验和岩石孔隙结构微观分析，提出低渗透岩石渗流形态判据，建立反映低渗透岩石渗透率演化规律的非线性模型；通过渗流应力耦合实验和岩石断口微观形态分析，建立反映应力-应变-渗流耦合过程的渗透率演化方程，揭示应力应变过程中渗流应力耦合机理；通过数值试验，建立反映低渗透岩石渗流应力耦合特性的多尺度非线性本构关系。研究成果将有助于推动低渗透岩石渗流力学理论的发展，为科学预测和分析低渗透岩石工程的渗流应力场及其工程应用提供理论方法。

中文关键词： 低渗透岩石；渗流；渗流应力耦合；渗透率；岩石力学

英文摘要： Low-permeability rock is the main media and the geological environment for store underground oil and gas and CO2 and nuclear waste disposal, the permeability properties testing of Low-permeability rock and hydro-mechanical coupling research is the challenge frontier problems in rock mechanics. In this study, the typical low-permeability rock is studied theoretically and experimentally, by means of development of test technical method, the threshold criterion of pressure pulse test for low-permeability rock of different levels will be proposed, the expression method of permeability for low-permeability rock is derived. Based on the permeability experiment and the microscopic tests of pore structure within rock, the criterion of seepage mode of low-permeability rock is proposed, the non-linear seepage model of reflecting the permeability evolution of low-permeability rock is established. According to hydro-mechanical coupling experiment and the microcosmic analysis to the rupture surface of rock specimen, the permeability evolution equation of reflecting the coupling of stress-strain-permeability is established, the HM coupling mechanism during the process of stress and strain will be developed. By means of simulation experiment, the muti-scale non-linear constitutive model of expression the HM coupling characteri

英文关键词： low-permeability rock；fluid flow；HM coupling；permeability；rock mechancis