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X-ray tomography imaging of shale microstructures: A review in the context of multiscale correlative imaging
International Journal of Coal Geology ( IF 5.6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.coal.2020.103641
Muhammad Arif , Mohamed Mahmoud , Yihuai Zhang , Stefan Iglauer

Abstract Shale microstructure determines hydrocarbon reserves and productivity. However, despite its high economic importance, the shale microstructure remains poorly understood. This is largely due to the complex pore space configuration in shale, and associated heterogeneity at multiple length scales. Here we review imaging techniques with which shale microstructure can be observed, and we highlight recent advancements in this area. Moreover, the limitations pertinent to x-ray tomography (μCT) methods and the outlook of research in this area are outlined. The presented datasets include recent investigations on shale microstructure characterization. We conclude that μCT can resolve shale microfractures, shale anisotropy, and microscale pore structure (at μm resolution). However, the relatively low μCT image resolution cannot precisely capture nanosized pores and organic matter. Indeed, it was observed that no single imaging technique is capable to fully characterize shale microstructure, instead a multiscale correlative imaging framework that spans multiple length scales is required (e.g. a combination of μCT, SEM, FIB-SEM). Thus, multiscale correlative imaging offers a powerful tool for shale microstructure quantification. This review article, therefore, provides an entry point for new researchers in this area, gives an overview of the current state of the art, and aids in further developments in this area, to improve hydrocarbon production from shale reservoirs.

中文翻译:

页岩微观结构的 X 射线断层扫描成像:多尺度相关成像背景下的综述

摘要 页岩微观结构决定油气储量和产能。然而,尽管页岩具有很高的经济重要性,但页岩的微观结构仍然知之甚少。这主要是由于页岩中复杂的孔隙空间构造以及多个长度尺度的相关非均质性。在这里,我们回顾了可以观察页岩微观结构的成像技术,并强调了该领域的最新进展。此外,还概述了与 X 射线断层扫描 (μCT) 方法相关的局限性以及该领域的研究前景。所提供的数据集包括最近对页岩微观结构特征的调查。我们得出结论,μCT 可以解决页岩微裂缝、页岩各向异性和微尺度孔隙结构(μm 分辨率)。然而,相对较低的 μCT 图像分辨率无法精确捕获纳米级孔隙和有机物。事实上,观察到没有单一的成像技术能够完全表征页岩微观结构,而是需要跨越多个长度尺度的多尺度相关成像框架(例如μCT、SEM、FIB-SEM的组合)。因此,多尺度相关成像为页岩微观结构量化提供了强大的工具。因此,这篇综述文章为该领域的新研究人员提供了一个切入点,概述了当前的技术水平,并有助于该领域的进一步发展,以提高页岩油藏的油气产量。相反,需要跨越多个长度尺度的多尺度相关成像框架(例如 μCT、SEM、FIB-SEM 的组合)。因此,多尺度相关成像为页岩微观结构量化提供了强大的工具。因此,这篇综述文章为该领域的新研究人员提供了一个切入点,概述了当前的技术水平,并有助于该领域的进一步发展,以提高页岩油藏的油气产量。相反,需要跨越多个长度尺度的多尺度相关成像框架(例如 μCT、SEM、FIB-SEM 的组合)。因此,多尺度相关成像为页岩微观结构量化提供了强大的工具。因此,这篇综述文章为该领域的新研究人员提供了一个切入点,概述了当前的技术水平,并有助于该领域的进一步发展,以提高页岩油藏的油气产量。
更新日期:2021-01-01
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