Micro-structural evolution and their effects on physical properties in different types of tectonically deformed coals

作     者：Yiwen Ju Kray Luxbacher Xiaoshi Li Guochang Wang Zhifeng Yan Mingming Wei Liye Yu 

作者机构：Laboratory of Computational GeodynamicsCollege of Earth ScienceUniversity of Chinese Academy of SciencesBeijing 100049China Department of Mining&Minerals EngineeringVirginia TechBlacksburgVA 24061USA 

出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)

年 卷 期：2014年第1卷第3期

页      面：364-375页

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.40772135,40972131 41030422) the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA05030100) National Science and Technology Major Project(No.2011ZX05060-005) 

主　　题：Tectonically deformed coals Formation mechanisms Macromolecular structure Pore structure Micro-structured evolution Coal bed methane 

摘      要：The macromolecular structure of tectonically deformed coals(TDC)may be determined by the deformation mechanisms of *** of the macromolecular structure change the pore structure of TDC and thereby impact physical properties such as porosity and *** study focuses on structure and properties of TDC from the Huaibei and Huainan coal mining areas of southern North *** between the macromolecular structure and the pore structure of TDC were analyzed using techniques such as X-ray diffraction,high-resolution transmission electron microcopy,and the low-temperature nitrogen *** results indicated that the directional stress condition can cause the arrangement of basic structural units(BSU)more serious and ***,the orientation is stronger in ductile deformed coal than in brittle deformed *** deformation directly influences the macromolecular structure of coal and consequently results in dynamic *** the size of BSU in brittle deformed coal increases more slowly than in ductile deformed coal,frictional heating and stress-chemistry of shearing areas might play a more important role,locally altering coal structure under stress,in brittle deformed *** energy is more significant in increasing the ductile deformation of ***,mesopores account for larger percentage of the nano-scale pore volume in brittle deformed coals,while mesopores volume in ductile deformed coal diminishes rapidly along with an increase in the proportion of micropores and *** research also approved that the deformations of macromolecular structures change nano-scale pore structures,which are very important for gas adsorption and pervasion space for ***,the exploration and development potential of coal bed methane is promising for reservoirs that are subjected to a certain degree of brittle deformation(such as schistose structure coal,mortar structure coal and cataclastic structure co