Study of the coal ultrafine fracures based on atomic force microscope (AFM)
Permeability of coal reservoir is closely related to cleats and exogenous fractures, but the diffusion speed of coalbed methane (CBM) in matrix is determined by the ultrafine fractures, which contributing to permeability can not be ignored. To different coal rank, the matrix has different ultrafine fractures. The representative samples of Taiyuan Xishan coke coal and Jiaozuo anthracite are measured by atomic force microscope (AFM)respectively, and 3D images of coal at the nanometer scale are obtained, from which the size of ultrafine fractures is measurable and pattern look clear. Furthermore, the accessory imager software has analysis functions such as the profile, power spectrums, roughness and fractal dimension, etc. The result shows that coke coal is superior to anthracite in regard to the quantity and connectivity of matrix micro-fractures, which is particularly favorable for the diffusion of CBM. So AFM with nano-meter resolution is a powerful tool to study micro-structure of coal.
CBM AFM ultrafine fractures diffusion
H. Y.Guo X.B. Su X. M. Ni
Key laboratory of biogenic traces and mineralization process of Henan, Jiaozuo, 454003, Henan, China School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, 454003, Henan, Chin
国际会议
徐州
英文
58-62
2009-09-24（万方平台首次上网日期，不代表论文的发表时间）