含水层微观孔隙分形特征与渗透性关联研究

为了探索宏观渗透性能与微观孔隙结构之间的相关性,本文研究了宏观参数渗透率与微观孔隙分形特征之间的关系。在分析砂岩孔隙介质分形模型的基础上,以林南仓矿补勘孔含水层段的9个岩芯样本为研究实例,采用切片制样和SEM技术,扫描断面微观结构,辅以MATLAB计算SEM图像中微观孔隙结构参数、计算其分形特征参数D f,建立了渗透率与分形特征参数D f的理论关系,并利用该公式计算了渗透率的理论值。为验证理论关系的正确性,对样本渗透率参数进行了实测,对比实测值与理论值,误差小于10%,说明微观孔隙分形特征与宏观渗透性能之间确实存在相关性。结论:利用钻孔岩芯微观分形特征及文中理论公式获取宏观渗透性规律将是一条可以尝试的技术路线。

Association study of fractal characteristics of microscopic pore with permeability of aquifer

To study the correlation of macroscopic permeability and micro-pore structure, the relationship between permeability of macroparameter and fractal characteristics of microscopic pore are mainly researched. Based on the analysis of fractal model of sandstone porous media, taking 9 samples of aquifers from supplementary exploration boreholes in Linnaneang mine as a study case, the microstructure of section is scanned by scanning electron microscope （SEM） technology after section sample preparation, parameters of micro-pore structure and fractal characteristics Df are calculated by MATLAB, the theoretical value of permeability can be obtained by theoretical formula of the permeability and Dr. To verify the correctness of theoretical formula, permeability parameters of samples are measured, there is a correlation indeed between fractal characteristics of microscopic pore and macroscopic permeability if the error less than 10% by compared the measured values with the theoretical values. As a conclusion, the route that macroscopic permeability rules are researched by cores of borehole, fractal characteristics of microscopic pore and the theoretical formula will be effective.