彬长矿区直罗组砂岩含水层孔隙结构及分形特征研究
Pore structure and fractal features of Zhiluo Formation sandstone aquifer in Binchang Mining Area
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摘要: 为了研究彬长矿区直罗组砂岩含水层的微观孔隙结构及分形特征，采用扫描电镜（SEM）获得不同深度下砂岩表面的孔隙规模、周长、面积及形态特征等表征参数，同时结合分形理论对砂岩含水层孔隙结构分形维数和形态特征进行深入分析。研究结果表明：彬长矿区直罗组砂岩含水层孔隙发育、形态多样，孔隙空间由大孔、中孔、小孔和微孔4种孔隙类型组成，其中中孔和大孔占孔隙总面积较大，是直罗组砂岩含水层主要的储水空间；根据砂岩样品提取的孔隙周长和面积，得到砂岩孔隙分形维数较大，孔隙分布不均匀，孔隙形态偏复杂。Abstract: In order to study the micro pore structure and fractal characteristics of Zhiluo Formation sandstone aquifer in Binchang Mining Area, the characterization parameters, such as pore size, perimeter, area and morphological characteristics of sandstone surface at different depths, are obtained by scanning electron microscope（ＳＥＭ）. At the same time, the fractal dimension and morphological characteristics of sandstone aquifer pore structure are deeply analyzed combined with fractal theory. The results show that the pores of the sandstone aquifer of Zhiluo Formation in Binchang Mining Area are developed and diverse, and the pore space is composed of four pore types: macropore, mesopore, small hole and micropore. The mesopores and macropores account for a large proportion of the total pore area and are the main water storage space of Zhiluo Formation sandstone aquifer. According to the pore perimeter and area extracted from sandstone samples, it is found that the fractal dimension of sandstone pores is large, the pore distribution is uneven, and the pore morphology is complex.
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