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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。
In order to explore the correlation between macroscopic permeability and microscopic pore structure, this paper studies the relationship between macroscopic parameter permeability and microscopic pore fractal characteristics. Based on the analysis of the fractal model of sandstone pore media, taking nine core samples from the aquifer section of the borehole in the Linnan reservoir as an example, the microstructure of the section was scanned with SEM and SEM. The SEM images were calculated with MATLAB The microscopic pore structure parameters were calculated and the fractal characteristic parameter D f was calculated. The theoretical relationship between permeability and fractal characteristic parameter D f was established and the theoretical value of permeability was calculated by this formula. In order to verify the correctness of the theoretical relationship, the permeability parameters of the samples were measured, the measured values were compared with the theoretical values, the error is less than 10%, indicating that there is a correlation between microscopic pore fractal characteristics and macroscopic permeability. Conclusion: The macroscopic permeability law can be tried by using the microscopic fractal features of drilling core and the theoretical formulas in the paper.