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Quantitative study on coal and shale pore structure and surface roughness based on atomic force microscopy and image processing

机译：基于原子力显微镜和图像处理的煤页岩孔隙结构和表面粗糙度定量研究

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摘要

The heterogeneity and micropores distribution of coal and shale reservoirs make them difficult to be quantitatively characterized by quick and economical approaches. A new method based on the atomic force microscopy (AFM) test is applied to reveal the pore structure and surface roughness of coal and shale with the help of open source Gwyddion software. The surface morphologies of coal and shale are reconstructed in two and three dimensions by AFM data, and the surface roughness is evaluated by parameters like mean roughness, mean square roughness, surface skewness, and kurtosis coefficient. Pores of different scales are quantitatively recognized by the Threshold and Watershed methods, and the two methods are combined for more accurate results. The Threshold method is appropriate for characterizing pores of 10-500 nm and the Watershed method is more suitable for 1-200 nm pores. Parameters such as pore numbers, plane porosity, pore size distribution, pore surface area and pore volume are obtained based on the combined method in revealing pores of 1-500 nm range. The tested samples are also evaluated by scanning electron microscope images, which shows a reliable consistency between the pore scales compared with the AFM results. The method, using easily accessed AFM experiment and open source software, can be widely used in characterizing the surface roughness and pore structure of unconventional oil and gas reservoirs.
机译：煤和页岩储集层的非均质性和微孔分布使它们难以通过快速，经济的方法进行定量表征。借助开源Gwyddion软件，采用一种基于原子力显微镜（AFM）测试的新方法来揭示煤和页岩的孔隙结构和表面粗糙度。利用AFM数据在二维和三维中重建了煤和页岩的表面形态，并通过平均粗糙度，均方粗糙度，表面偏度和峰度系数等参数评估了表面粗糙度。 “阈值”和“分水岭”方法可定量识别不同尺度的毛孔，将两种方法结合使用可获得更准确的结果。 “阈值”方法适用于表征10-500 nm的孔，而“分水岭”方法更适用于1-200 nm的孔。基于组合方法，在揭示1-500nm范围内的孔的情况下获得了诸如孔数，平面孔隙率，孔尺寸分布，孔表面积和孔体积的参数。还通过扫描电子显微镜图像对测试样品进行了评估，与AFM结果相比，该图像显示了孔径之间的可靠一致性。该方法使用易于访问的AFM实验和开源软件，可广泛用于表征非常规油气藏的表面粗糙度和孔隙结构。

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  • 来源
    《Fuel》 |2019年第15期|78-90|共13页
  • 作者

    Zhao Shihu; Li Yong; Wang Yanbin; Ma Zhentao; Huang Xiaoqiang;

  • 作者单位

    China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China;

    China Univ Min & Technol, Coll Geosci & Surveying Engn, Beijing 100083, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Pore structure; Shale gas; Surface roughness; AFM; Plane porosity;

    机译：孔隙结构;页岩气;表面粗糙度;原子力显微镜;平面孔隙率;

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