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"Structure feature and evolution mechanism of pores in different metamo" by Jiangang Ren, Zhimin Song et al.


Abstract
Coal pore structure plays a crucial role in the adsorption, migration and production of coalbed gas, and its feature and evolution are mainly controlled by metamorphism and deformation. In this study, the original and tectonically deformed structures of middle- and high-rank coal samples (R , = 1.14–3.44%) were obtained through low-temperature nitrogen adsorption (LTNA), small-angle X-ray scattering (SAXS) and scanning electron microscopy (SEM) to analyze the pore structure of both open pores and closed pores. Moreover, we investigate the evolution features and mechanism of pore structure with different metamorphism and deformation degrees by comparing the pore structures of these samples with those of low-rank tectonically deformed coals (R , = 0.88–0.96%). The differentiation and inheritance are summarized as the distinctive evolution feature of pore structure of coal with different metamorphism and deformation degree. The pore size of tectonically deformed ....

Closed Pore , Oal Metamorphism , More Structure , Ectonically Deformed Coal ,