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Based on the particle size evolution of tectonic coal in formation process, the differences between tectonic coal and intact coal in pore structure and initial gas desorption characteristics were studied. Then, the influences of particle size reduction on pore structure and initial gas desorption characteristics were investigated; and the initial gas energy release model was derived, which was used to calculate the gas expansion energy of tectonic coals with different particle sizes. This study ...

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...