Spectra response from macromolecular structure evolution of tectonically deformed coal of different deformation mechanisms  

作　　者：LI XiaoShi JU YiWen HOU QuanLin LIN Hong 

机构地区：[1]Key Laboratory of Computational Geodynamics,College of Earth Science,Graduate University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China Earth Sciences》2012年第8期1269-1279,共11页中国科学（地球科学英文版）

基　　金：supported by National Natural Science Foundation of China (Grant Nos.40772135,40972131 and 41030422);National Basic Research Program of China (Grant Nos.2009CB219601 and 2006CB202201);Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA05030100)

摘　　要：Coals with different deformation mechanisms(brittle deformation,brittle-ductile deformation,and ductile deformation) repre-sent different ways in macromolecular structure evolution based on the metamorphism.The evolution of coal structure could affect the occurrence condition of coalbed methane(CBM) because the nanopore structure affected by macromolecular struc-ture is the most important reservoir for CBM.This paper analyzes the evolutions and mechanisms of structure and functional group of tectonically deformed coals(TDCs) collected from Huainan-Huaibei coalfield using X-ray diffraction(XRD),Raman spectroscopy,and Fourier Transform Infrared(FTIR) spectroscopy methods.The results show that the macromolecular struc-ture evolutions of TDC are different from the primary structure coal as a result of the different metamorphic grade and defor-mation mechanisms.The different deformation mechanisms variously affect the process of functional group and polyconden-sation of macromolecular structure.Furthermore,the tectonic deformation leads to secondary structural defects and reduces the structure stability of TDC.The coupled evolution on stacking and extension caused by the changes of secondary structural de-fects results from different deformation mechanisms.We consider that the changes of chemical structure and secondary struc-tural defects are the primary reasons for the various structure evolutions of TDC compared with primary structure coal.Coals with different deformation mechanisms （brittle deformation, brittle-ductile deformation, and ductile deformation） repre- sent different ways in macromolecular structure evolution based on the metamorphism. The evolution of coal structure could affect the occurrence condition of coalbed methane （CBM） because the nanopore structure affected by macromolecular struc- ture is the most important reservoir for CBM. This paper analyzes the evolutions and mechanisms of structure and functional group of tectonically deformed coals （TDCs） collected from Huainan-Huaibei coalfield using X-ray diffraction （XRD）, Raman spectroscopy, and Fourier Transform Infrared （FTIR） spectroscopy methods. The results show that the macromolecular struc- ture evolutions of TDC are different from the primary structure coal as a result of the different metamorphic grade and defor- mation mechanisms. The different deformation mechanisms variously affect the process of functional group and polyconden- sation of macromolecular structure. Furthermore, the tectonic deformation leads to secondary structural defects and reduces the structure stability of TDC. The coupled evolution on stacking and extension caused by the changes of secondary structural de- fects results from different deformation mechanisms. We consider that the changes of chemical structure and secondary struc- tural defects are the primary reasons for the various structure evolutions of TDC compared with primary structure coal.

关 键 词：tectonicaHy deformed coal METAMORPHISM deformation mechanism macromolecular structure secondary structuraldefect 

分 类 号：P618.110.2[天文地球—矿床学] TQ531.3[天文地球—地质学]