砂岩渗透性能微观图像分形分析  

Analysis on the permeability of sandstone with fractal theory

作　　者：徐艳玲 徐斌[2] 尹尚先[2] 

机构地区：[1]中铁二院重庆勘察设计研究院有限责任公司,重庆400023 [2]华北科技学院河北省矿井灾害防治重点实验室,北京东燕郊101601

出　　处：《工程勘察》2014年第6期45-49,共5页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(51074075);十二五国家科技支撑计划项目(2012BAK04B04);河北省自然科学基金(E2012508001)联合资助

摘　　要：砂岩渗透性能一般都通过实验室或野外试验测试确定。本文基于岩石微观空隙分形特点,确立了岩石渗透率与分形维数的定量关系,实现了直接利用岩芯电镜扫描微观图像分形技术测定岩石宏观渗透性能的目标。为了精确统计SEM图像中不规则孔的面积、周长、半径、个数等参数,解决获取切片孔喉分形维数这一难题,应用Imagepro plus专业图像软件处理扫描电镜切片图像。将岩石渗透率理论值与实验室渗透率测定结果对比,结果表明:宏观渗透率与微观分形参数D的理论关系式成立,具有工程应用推广价值。Permeability of sandstones is generally obtained by laboratory or field tests. Based on the analysis of fractal characteristics of rock gap, the quantitative relation between rock permeability and fraetal dimension is obtained which could determine the macroscopic rock permeability by fractal technology of the rock core scanning image with electron microscopic. In order to calculate the area, perimeter, radius, and the number of parameters of the image area accurately and obtain slice pore fractal dimension, the picture is analyzed by professional image software, Imagepro plus. Comparing theoretical permeability of sandstone and the experimental value, the results show that theoretical relationship between macroscopic permeability and microcosmic fractal parameter is correct and it is worthy of expanding and application in engineering.

关 键 词：砂岩 渗透性能 分形几何 电镜扫描 Imagepro PLUS软件 

分 类 号：P641.2[天文地球—地质矿产勘探] O189[天文地球—地质学]