CAJ | 학술논문

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，也是水利水电等工程建设中常见的一种复杂介质。利用河海大学与法国国家科研中心里尔力学研究所共同研发的低渗透岩石惰性气体渗透试验系统，以氩气为渗透介质，测试了3种低渗透岩石在不同围压作用下的有效孔隙率和气体渗透率的变化规律，分析和讨论了孔隙率和渗透率随围压的变化关系以及孔隙率与渗透率之间的函数关系。试验结果表明，对低渗透岩石，随着围压的增大，孔隙率和渗透率呈指数函数关系递减，试样BSE微观结构图像结果也表明了围压与孔隙结构的相关关系；在不考虑孔隙坍塌效应时，渗透率与孔隙率之间符合幂函数关系。
저삼투암석시지하석유화천연기저존、CO2저존、핵폐료처치적주요개질화지질배경，야시수이수전등공정건설중상견적일충복잡개질。이용하해대학여법국국가과연중심리이역학연구소공동연발적저삼투암석타성기체삼투시험계통，이아기위삼투개질，측시료3충저삼투암석재불동위압작용하적유효공극솔화기체삼투솔적변화규률，분석화토론료공극솔화삼투솔수위압적변화관계이급공극솔여삼투솔지간적함수관계。시험결과표명，대저삼투암석，수착위압적증대，공극솔화삼투솔정지수함수관계체감，시양BSE미관결구도상결과야표명료위압여공극결구적상관관계；재불고필공극담탑효응시，삼투솔여공극솔지간부합멱함수관계。
The low-permeability rock is the main material and geological environment for storing under? ground oil and gas, CO2 and radioactive waste, and also a complex media usual using in water resource and hydropower. In this study, based on the gas permeability and porosity test system jointly developed by the Rock Mechanics Laboratory of Geotechnical Research Institute of Hohai University of China and Lille University of Science and Technology of France, using the inert gas of argon as the fluid medium, the stress-dependent permeability and porosity of (weathering) granite and monzonitic granite are measured, the change of porosity and permeability with the confining pressure and the function relationship between porosi? ty and permeability are analyzed and discussed. The test results show that, for the low-permeability rock, the porosity and permeability exponential decrease with the increase of confining pressure, the BSE micro? structure images of tested rock sample also illustrates the relationship between the confining pressure and the structure of rock;when the particle crushing mechanism is not involved in the evolution of the permea? bility, a power law can better describe the relationship among the permeability and porosity of the test rock specimens.