盐岩渗透性影响因素研究综述  

SUMMARY ON INFLUENCE OF PERMEABILITY OF ROCK SALT

作　　者：王新志[1] 汪稔[1] 杨春和[1] 江浩[1] 谭峰屹[1] 

机构地区：[1]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《岩石力学与工程学报》2007年第A01期2678-2686,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金重点项目(50434050)

摘　　要：由于盐岩具有极低的渗透性(渗透率小于10-20 m2),很多国家将盐岩作为能源(石油、天然气)和核废料储存库的首选岩体。发达国家利用盐岩建造能源储备库技术已经相当成熟,而国内尚处于研究阶段。盐岩力学特性和溶腔的稳定性研究已得到国内学者的广泛重视,而由于试验仪器精度的限制,对其渗透性的研究较少。为系统地研究盐岩的渗透性,通过总结众多国内外学者的学术观点,从内因和外因两个方面对盐岩渗透性进行分析。详细介绍盐岩的孔隙结构、孔隙率、Klinkenberg效应、毛细孔压力、应力状态等对其渗透性的影响。研究成果认为:盐岩的孔隙结构和低孔隙率是其低渗透性的根本原因,极小的孔隙半径导致在孔隙中产生很高的毛细孔压力,Klinkenberg效应、毛细管压力阻碍流体在盐岩孔隙中的运移和扩散。开挖扰动改变盐岩所受的应力状态,盐岩在偏应力作用下容易发生膨胀变形,破坏盐岩的孔隙结构,从而使渗透性显著增强。Rock salt is known for its very low permeability.Therefore,rock salt formations are commonly used as host rock for storage caverns（oil or natural gas） and are being considered for the long-term disposal of radioactive waste.The technology of construction of underground repository for energy in rock salt is rather mature in industrialized countries,but in China it is just ongoing now.The mechanical properties and stability of salt caverns have been paid extensive attention by domestic researchers.However,study on permeability of rock salt is seldom seen because of the precision limit of testing equipments.In order to investigate the permeability of rock salt systematically,various viewpoints from a number of researchers have been taken into consideration.The relation between permeability and porous structure,porosity,Klinkenberg effect,capillary pressure is discussed in detail.It′s concluded that the porous structure will take main responsibility for the extremely low permeability of rock salt.Fluid migration is affected by Klinkenberg effect and the extremely high capillary pressure,which are resulted from very small porosities in rock salt.Excavation in rock salt will destroy the initial state of equilibrium and lead to dilatancy deformation,which reveals the generation and propagation of cracks and increase of damage.Dilatancy and damage destroy the porous structure of rock salt and its permeability increases remarkably.

关 键 词：岩石力学 盐岩 渗透率 Klinkenberg效应 毛细孔压力 膨胀变形 孔隙结构 

分 类 号：TU45[建筑科学—岩土工程]