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《科学通报(英文版)》 2005-16
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Relationship between nano-scale deformation of coal structure and metamorphic-deformed environments

JU Yiwen1, 2, JIANG Bo1, HOU Quanlin2 & WANG Guiliang1 1. College of Mineral Resource and Geosciences, China University of Mining and Technology, Xuzhou 221008, China; 2. Laboratory of Computational Geodynamics, College of Geosciences, Graduate University of Chinese Academy of Sciences, Beijing 100049, China  
There is a more consanguineous relation be-tween nano-scale deformation of coal structure and meta-morphic-deformed environment. In different metamor-phic-deformed environments, deformation in the coal struc-ture can occur not only at micro-scale, but also at nano-scale, and even leads to the change of molecular structure and nano-scale pore (100 nm) structure. The latter is the main space absorbing coalbed methane. Through X-ray diffraction (XRD) and liquid–nitrogen absorption methods, the charac-teristics of macromolecular and nano-scale pore structures of coals in different metamorphic-deformed environments and deformational series of coals have been studied. By combin-ing with high-resolution transmission electron microcopy (HRTEM), the macromolecular and nano-scale pore struc-tures are also directly observed. These results demonstrate that the stacking Lc of the macromolecular BSU in tectonic coals increases quickly from the metamorphic-deformed environment of low rank coals to that of high rank coals. For different deformed tectonic coals, in the same metamor-phic-deformed environment, the difference of Lc is obvious. These changes reflect chiefly the difference of different tem-perature and stress effect of nano-scale deformation in tec-tonic coals. The factor of temperature plays a greater role in the increase of macromolecular structure parameters Lc, the influence of stress factor is also important. With the stress strengthening, Lc shows an increasing trend, and La /Lc shows a decreasing trend. Therefore, Lc and La /Lc can be used as the indicator of nano-scale deformation degree of tectonic coals. With increasing temperature and pressure, especially oriented stress, the orientation of molecular structure be-comes stronger, and ordering degree of C-nets and the ar-rangement of BSU are obviously enhanced. For the deforma-tion of nano-scale pore structure, in the same metamor-phic-deformed environment, along with the strengthening of stress, the ratio of mesopores to its total pores volume of tec-tonic coals reduces to a large extent, the ratio of volume of micropores and the pores whose diameters are lower than micropores increases, and sub-micropores and ultra- micro-pores can be found. Moreover, the ratio of specific surface area of mesopores to its total pores reduces rapidly while theamount of sub-micropores increases more quickly. The duc-tile structure coal has a change in pore parameters similar to that of weak brittle deformation. There are differences in the deformation and evolution of nano-scale pore structure of different kinds of tectonic coals formed in different meta-morphic-deformational environments. In short, temperature and confining pressure play some role in the change of nano-scale pore structure parameters, whereas stress has important influence on the evolution of characteristic parameters in nano-scale pore structure of tectonic coals.
【CateGory Index】: P618.11;
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1 JU YiWen1,JIANG Bo2,HOU QuanLin1,TAN YongJie3,WANG GuiLiang2 & XIAO WenJiao4 1 College of Earth Science,Graduate University of Chinese Academy of Sciences,Beijing 100049,China; 2 College of Mineral Resource and Geoscience,China University of Mining & Technology,Xuzhou 221008,China; 3 Development and Research Center of China Geological Survey,Beijing 100083,China; 4 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;Behavior and mechanism of the adsorption/desorption of tectonically deformed coals[J];科学通报(英文版);2009-01
【Secondary References】
Chinese Journal Full-text Database 1 Hits
1 Chen Fuyong1, Ju Yiwen2, Li Xiaoshi2, Fan Junjia2, Liang Ying31.Geological Survey Department of Anhui Huaibei Mining Group Company,Huaibei 235000,China2.College of Earth Science,Graduate University of Chinese Academy of Sciences,Beijing 100049,China3.Geophysical and Geological Division,Hebei Bureau of Coal Geology,Xingtai 054000,China;Diffusion-osmosis characteristics of coalbed methane in tectonically deformed coals and their mechanism[J];Earth Science Frontiers;2010-01
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