Matrix permeability anisotropy of organic-rich marine shales and its geological implications: Experimental measurements and microscopic analyses

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-12-12 DOI:10.1016/j.coal.2024.104670
Yong Ma, Huiting Hu, Zhejun Pan, Ningning Zhong, Fujie Jiang, Chengyu Yang, Jianbin Ma, Binhao Feng
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Abstract

Due to the presence of natural and/or preparation-related fractures, the anisotropy of the matrix permeability of shales is usually difficult to characterize. In this study, we used X-ray micro-computed tomography (XRμCT) imaging to select samples from the Lower Cambrian and Upper Ordovician Wufeng Formation and the Lower Silurian Longmaxi Formation of the Upper Yangtze Platform, China, showing no natural or artificial fractures. From these samples, cubic specimens were prepared with a wire saw and then re-inspected for fractures. Using a specially developed sample holder, the matrix permeability of these specimens were measured in the three principal directions using the pulse decay method with N2 as the flowing fluid. To analyze the microscopic lithological and structural controls on shale matrix permeability anisotropy, we employed a combined methodology using thin sections, focused ion beam-scanning electron microscopy (FIB-SEM), and permeability simulation.
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由于天然和/或制备相关裂缝的存在,页岩基质渗透率的各向异性通常难以表征。在这项研究中,我们利用 X 射线显微计算机断层扫描(XRμCT)成像技术,从中国长江上游地台的下寒武统、上奥陶统五峰组和下志留统龙马溪组选取了没有天然或人工裂缝的样品。用线锯从这些样本中制备出立方体样本,然后重新检查裂缝。使用专门开发的样品支架,以 N2 为流动液体,采用脉冲衰减法测量了这些样品在三个主要方向上的基质渗透率。为了分析页岩基质渗透率各向异性的微观岩性和结构控制因素,我们采用了薄片、聚焦离子束扫描电子显微镜(FIB-SEM)和渗透率模拟相结合的方法。
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
期刊最新文献
Matrix permeability anisotropy of organic-rich marine shales and its geological implications: Experimental measurements and microscopic analyses Editorial Board Anomalies in Vicker's microhardness of subbituminous and high volatile bituminous coals Organic petrology and geochemistry of the late Neogene Shizigou Formation in the Qaidam Basin, China: Characteristics of a prospective microbial gas source rock Corrigendum to “Characteristics of the low-pressure spatial and temporal distributions of oil- and gas-bearing layers in the Ordos Basin, China” [Int. J. Coal Geol. 2024 (285) 104476].
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