煤岩孔隙结构分形特征表征方法研究
Study on method to characterize fractal features ofpore structures in coal and rock mass
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摘要: 为了进一步完善煤岩孔隙结构分形特征表征模型及方法，在多孔介质分形定义基础上，通过理论推理建立了适用于煤岩孔隙结构的分形特征表征方法，并通过煤岩压汞试验，评价了不同表征方法之间的差异，最后对煤岩的分形区间和分形维数进行了探讨。结果表明，建立的新型方法能够有效表征煤岩孔隙结构分形特征，煤岩孔隙结构不具有分段分形特征，分段分形特征可能是表征方法不精确导致的。煤岩孔隙结构分形维数越大，煤储层物性越差，非均质性越强。Abstract: In order to further improve the characterization method of the fractal features,based on the fractal definition of the porous medium, with the theoretical inference, the characterization method of the fractal features was established suitable to the pore structure of the coal and rock. With the pressurized mercury experiments on the coal and rock, the paper had the evaluation on the differences between the different characterization methods. Finally, a discussion was conducted on the fractal interval and the fractal dimension of the coal and rock. The results showed that the new method established could effectively characterize the fractal features of the coal and rock pore structures and the coal and rock pore structure would not have the sectional fractal features. The sectional feature might be caused by the inaccuracy of the characterization method. The higher of the fractal dimension of the coal and rock pore structure was, the physical properties of the coal reservoir would be poor and the heterogeneity would be stronger.
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