›› 2018, Vol. 39 ›› Issue (5): 1789-1795.doi: 10.16285/j.rsm.2016.1243

• 基础理论与实验研究 • 上一篇    下一篇

单相流体对砂岩强度特性的影响

李凯达1,胡少斌2,李小春2,伍 键1,樊清怡1,伍海清2   

  1. 1. 武汉理工大学 土木工程与建筑学院,湖北 武汉 430070; 2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,湖北 武汉 430071
  • 收稿日期:2016-05-30 出版日期:2018-05-11 发布日期:2018-06-12
  • 通讯作者: 胡少斌,男,1990年生,在站博士后,主要从事CO2地质封存力学稳定性评价方面的研究工作。E-mail:hsbcumt@126.com E-mail:inkstamplee@outlook.com
  • 作者简介:李凯达,男,1995年生,硕士研究生,主要从事CO2地质封存力学稳定性评价方面的研究工作。
  • 基金资助:

    国家重点研发计划项目(No. 2016YFB0600805);中国清洁发展机制基金赠款项目(No.2014069);中国博士后科学基金面上项目(No. 2015M582313);中国博士后科学基金特别资助(No. 2016T90745);国家自然科学基金面上项目(No. 41172285)。

Influence of single-phase fluid on strength characteristics of sandstone

LI Kai-da1, HU Shao-bin2, LI Xiao-chun2, WU Jian1, FAN Qing-yi1, WU Hai-qing2   

  1. 1. School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, Hubei 430070, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Received:2016-05-30 Online:2018-05-11 Published:2018-06-12
  • Supported by:

    This work was supported by the National Key Research and Development Program of China (No. 2016YFB0600805), China Clean Development Mechanism Fund Grant Project (2014069), the China Postdoctoral Science Foundation Funding (2015M582313), the China Postdoctoral Science Foundation Funding (2016T90745) and the General Program of the National Natural Science Foundation of China (41172285).

摘要: 在CO2地质封存过程中,CO2注入深部岩层,引起地层孔隙流体组分和压力的改变,影响岩层的力学稳定性,可能导致储盖层破裂、地表隆起,并引发中小规模地震等不良后果。以砂岩为试验研究对象,以CO2、N2、H2O作为孔隙流体介质,通过控制和调节流体的温度和孔隙压力,开展了单相流体作用下岩石三轴压缩力学特性对比试验,分析了单相流体耦合作用下岩石强度、弹性模量和泊松比等基本力学参数。研究发现,高压孔隙流体使干燥砂岩的峰值强度和弹性模量均出现不同程度降低,泊松比却有较为明显的升高现象,且影响作用从大到小依次为H2O、CO2、N2。孔隙流体降低了干燥砂岩的脆性,并增强了塑性变形,且含水砂岩塑性最强。孔隙流体对砂岩力学特性影响程度取决于流体与岩石矿物成分的相互作用强弱,分析认为砂岩中不同矿物成分对CO2、N2、H2O的选择性吸附导致孔隙流体对砂岩强度影响差异明显,且作用效应从大到小依次为H2O、CO2、N2。

关键词: CO2地质封存, 单相流, 真三轴试验, 强度特性, 砂岩

Abstract: In the process of CO2 geological storage, the mechanical stability of rock can be influenced by changes in the composition and pressure of pore fluid due to CO2 injection into deep rock stratum. In addition, adverse consequences may further arise, such as reservoir caprock rupture, surface uplifting, and small and medium scale earthquakes. The triaxial compression tests of rock were conducted to compare the effects of pore fluid media of supercritical CO2, N2 and H2O under single-phase fluid. The fluid temperature and pore fluid pressure were controlled and adjusted to analyse the strength, elastic modulus and Poisson's ratio under single-phase fluid coupling. It was found that the peak strength and elastic modulus of dry sandstone were reduced at various degrees by high-pressure pore fluid. However, Poisson’s ratio increased obviously, and the impacts of pore fluid were H2O, CO2 and N2 in the descending order. The pore fluid decreased the brittleness of dried yellow sandstone and enhanced plastic deformation to a certain degree. Besides, the water-bearing sandstone had the strongest plastic property. The effect of pore fluid on mechanical properties of sandstone depended on the strength of interaction between the fluid and mineral composition of rock. The selective absorption of CO2, N2 and H2O by different mineral compositions of sandstone resulted in a significant difference in the effect of pore fluid on sandstone strength. The action effects ranked as H2O, CO2 and N2 in the ascending order.

Key words: CO2 geological storage, single-phase, ture triaxial test, strength properties, sandstone

中图分类号: 

  • TU 452

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