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Journal of Porous Media
インパクトファクター: 1.752 5年インパクトファクター: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN 印刷: 1091-028X
ISSN オンライン: 1934-0508

巻:
巻 24, 2021 巻 23, 2020 巻 22, 2019 巻 21, 2018 巻 20, 2017 巻 19, 2016 巻 18, 2015 巻 17, 2014 巻 16, 2013 巻 15, 2012 巻 14, 2011 巻 13, 2010 巻 12, 2009 巻 11, 2008 巻 10, 2007 巻 9, 2006 巻 8, 2005 巻 7, 2004 巻 6, 2003 巻 5, 2002 巻 4, 2001 巻 3, 2000 巻 2, 1999 巻 1, 1998

Journal of Porous Media

DOI: 10.1615/JPorMedia.2019025242
pages 1305-1320

A METHOD FOR EXTRACTING 3D FRACTURE GEOMETRIES AND ACQUIRING THEIR MECHANICAL PROPERTIES FROM CT SCANNING IMAGES

Sheng Sang
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xu Zhou 221116, Jiangsu Province, China
Weiqun Liu
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xu Zhou 221116, Jiangsu Province, China; College of Architecture and Civil Engineering, Wuyi University, Wuyishan 354300, China
Zhen Shen
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xu Zhou 221116, Jiangsu Province, China
Tianran Ma
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xu Zhou 221116, Jiangsu Province, China

要約

Fractures in rock masses subjected to considerable in situ stress may close, propagate, or coalescence with other weak planes. These responses determine the mechanical properties of the rock and can significantly influence the exploitation of oil and gas resources and the construction of subsurface civil engineering projects. In this paper, based on computed tomography (CT) scanning images, we proposed a method for extracting the three-dimensional (3D) geometries of fractures in rock samples and acquiring the initial fracture stiffness and maximum apertures. In this method, fractures in coal samples were extracted from CT scans by combining Sobel edge detection with a local threshold algorithm and were then reconstructed through superposition. To analyze the mechanical properties of these fractures, the reconstructed fractures were subsequently divided into several fragments simplified as two subparallel plates. The initial fracture stiffness was subjected to the distribution and magnitude of the initial contact areas of a fracture. For a single fracture, if the initial contact areas are larger and more dispersed, the initial fracture stiffness will increase. The permeability values calculated from the reconstructed 3D fractures are consistent with and have the same order of magnitude as those from laboratory experiments. Therefore, this method is effective and can be used to elucidate the entire process of fracture closure and to predict the permeability of rocks.

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