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对页岩成像的电子断层扫描能力的评估

Laura Frouté¹, Emeric Boigné², Isabelle C Jolivet³

¹Department of Energy Science & Engineering, Stanford University, Stanford, CA 94305, USA.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada

|November 9, 2023

概括

电子断层扫描 (ET) 可以对页岩纳米孔进行成像,但重建挑战会影响准确性. 大孔重建得很好,而纳米尺度的特征显示出可变性,这表明ET方法有改进的余地.

科学领域:

材料科学材料科学材料科学
地质科学是地球科学.
纳米技术纳米技术

背景情况:

电子断层扫描 (ET) 为3D成像提供了高分辨率,但面临着诸如低信号噪声和有限投影角度等挑战.
页岩是一种复杂的纳米孔隙介质,需要先进的成像技术来了解其孔隙结构,以便用于储能和流体运输等应用.

研究的目的:

评估电子断层扫描用于重建页岩3D孔隙结构的能力和局限性.
量化重建技术和采集条件对页岩孔状特征的准确性的影响.

主要方法:

创建了一个1.24nm像素大小的巴内特页岩的数值3D幻影.
2D投影图像使用常见的技术进行了数值生成和重建.
重建不确定性的评估是通过比较孔径指标和voxel分类与幻影进行的.
采购条件有所变化,以量化文物效应.

主要成果:

重建技术显示大孔的良好一致性,但纳米尺度特征的更高可变性.
有限的投影范围和重建算法被确定为关键瓶.
存储和运输指标的准确性受到重建不确定性的影响.

结论:

电子断层扫描是一种有价值的工具,用于表征页岩纳米孔,特别是较大的特征.
在样品准备 (稀释),硬件 (持有者) 和重建算法的改进对于准确的纳米特征成像至关重要.
解决重建局限性是推进复杂地质材料中ET应用的关键.

关键词:

3D扫描传输电子显微镜3D扫描传输电子显微镜电子断层扫描是一种电子断层扫描.纳米孔径的地质材料.页岩的多孔性页岩的多孔性非传统的水库的特征描述.

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