Scale-Dependent Nature of Porosity and Pore Size Distribution in Lacustrine Shales: An Investigation by BIB-SEM and X-Ray CT Methods
Scale-Dependent Nature of Porosity and Pore Size Distribution in Lacustrine Shales: An Investigation by BIB-SEM and X-Ray CT Methods
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湖相页岩孔隙度和孔径分布的尺度依赖性：通过 BIB-SEM 和 X 射线 CT 方法进行研究
DOI：
10.1007/s12583-018-0835-z
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发表时间：
2018-11
影响因子：
3.3
通讯作者：
Li Wenbiao
中科院分区：
文献类型：
--
作者：
Li Junqian;Zhang Pengfei;Lu Shuangfang;Chen Chen;Xue Haitao;Wang Siyuan;Li Wenbiao
由于页岩中孔隙分布的不均匀性，通过扫描电子显微镜（SEM）和X射线计算机断层扫描（CT）方法确定的页岩的岩石物理性质强烈依赖于观察到的域大小（分析尺度）。采用宽离子束扫描电镜（BIB）和X射线CT方法，研究了分析尺度对渤海湾盆地东营凹陷湖相页岩面孔隙度、体孔隙度和孔径分布的影响。高分辨率（10 nm/pixel）和大视场（>1 mm 2）的BIB-SEM剖面主要描述了两个页岩（样品F41#-2和Y556#-1）中的二维纳米孔隙系统，而分辨率为0.42（F41#-1）和0.5 μm/pixel（H172#-1）的基于CT的三维重建反映了三维亚微米孔隙系统。结果表明，随着分析面积（体积）的增加，面（体）孔隙度呈现出多重幂律分布，可以用来外推给定面积（体积）的孔隙度。基于SEM和CT研究，分别确定了与孔隙系统非均匀性密切相关的最小代表单元面积（REA）和体积（REV）的大小。建议最小REA为2.93×104（F41#-2）和0.91×104μm2（Y556#-1），最小REV为0.016（F41#-1）和0.027 mm 3（H172#-1）。由于分析面积（体积）大于最小REA（REV），因此获得的2D（3D）PSD彼此相当，可以认为反映了页岩PSD。这些结果提供了深入了解的孔隙度和PSD表征页岩的SEM和X射线CT方法。
Due to heterogeneous pore distributions within shales, petrophysical properties of shales determined by scanning electron microscopy (SEM) and X-ray computed tomography (CT) methods strongly depend on the observed domain size (analysis scale). In this paper, the influence of the analysis scale on areal and bulk porosities and pore size distribution (PSD) for lacustrine shales from the Dongying sag of Bohai Bay Basin, China were investigated using broad ion beam (BIB)-SEM and X-ray CT methods. The BIB-SEM cross-sections with high imaging resolution (10 nm/pixel) and a large field of view (>1 mm2) mainly describe the 2D nanoscale pore system in the two shales (samples F41#-2 and Y556#-1), while CTbased 3D reconstructions with resolutions of 0.42 (F41#-1) and 0.5 μm/pixel (H172#-1) reflect the 3D submicron pore system. The results indicate that the areal (bulk) porosity exhibits a multiple power-law distribution with increasing analysis area (volume), which can be used to extrapolate the porosity of a given area (volume). Based on SEM and CT investigations, the sizes of the minimum representative elementary areas (REAs) and volumes (REVs) were determined respectively, which are closely associated with the heterogeneousness of the pore system. Minimum REAs are proposed to be 2.93×104(F41#-2) and 0.91×104μm2(Y556#-1), and minimum REVs are 0.016 (F41#-1) and 0.027 mm3(H172#-1). As the analyzed areas (volumes) are larger than the minimum REA (REV), obtained 2D (3D) PSDs are comparable to each other and can be considered to reflect the shale PSD. These results provide insights into the porosity and PSD characterization of shales by SEM and X-ray CT methods.
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