Study on fracture characteristics in coal and shale for coal-measure gas reservoir based on 3D CT reconstruction and fractal features

作     者：Huijun WANG Shangbin CHEN Shaojie ZHANG Chengxing ZHANG Yang WANG Gaofeng YI Yixuan PENG Huijun WANG;Shangbin CHEN;Shaojie ZHANG;Chengxing ZHANG;Yang WANG;Gaofeng YI;Yixuan PENG

作者机构：School of Resources and GeoscienceChina University of Mining and TechnologyXuzhou 221116China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process(the Ministry of Education)China University of Mining and TechnologyXuzhou 221116China School of Earth Sciences and EngineeringSun Yat-sen UniversityGuangzhou 510275China 

出 版 物：《Frontiers of Earth Science》 (地球科学前沿（英文版）)

年 卷 期：2023年第17卷第2期

页      面：514-526页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41972171 and 42172156) the Fundamental Research Funds for the Central Universities(No.2020CXNL11) the Graduate Innovation Program of China University of Mining and Technology(No.KYCX22_2604) the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD) 

主　　题：pore-fracture system fracture distribution directionality heterogeneity CT experiment coalmeasure gas reservoirs 

摘      要：Pores and fractures are important components of flow channels in coal-measure gas *** considerable studies have been conducted on pore structure evolution,very few studies have investigated the fracture distribution and self-similarity *** reveal the characteristics of fracture distribution in coal and shale reservoirs,computed tomography studies were performed on 15 coal and shale samples from the Shanxi and Taiyuan *** results show that the fracture distribution of samples of the same lithology differs significantly,and the fracture distribution heterogeneity of shale samples is much higher than that of coal *** shale,the heterogeneity of fracture distribution is mainly caused by pores and fractures smaller than 2μm in the z-direction,with relatively little contributions from pores and fractures in the x and y ***,the heterogeneity of fracture distribution in coal is mainly controlled by pores and fractures larger than 2μm in all directions,and the difference between the three directions is *** was shown that a great number of microscopic pores and fractures contribute to the highest fractions of porosity in different lithological *** method is useful for determining the fracture distribution characteristics in shale and coal-measure gas reservoir.