Fractal classification and natural classification of coal pore structure based on migration of coal bed methane
According to the data of 146 coal samples measured by mercury penetration, coal pores are classified into two levels of ＜65 nm diffusion pore and ＞65 nm seeping pore by fractal method based on the characteristics of diffusion, seepage of coal bed methane(CBM) and on the research results of specific pore volume and pore structure. The diffusion pores are further divided into three categories: ＜8 nm micropore, 8-20 nm transitional pore, and 20-65 nm minipore based on the relationship between increment of specific surface area and diameter of pores, while seepage pores are further divided into three categories: 65-325 nm mesopore,325-1000 nm transitional pore, and ＞1000 nm macropore based on the abrupt change in the increment of specific pore volume.
作 者： FU Xuehai QIN Yong ZHANG Wanhong WEI Chongtao ZHOU Rongfu 作者单位： College of Mineral Resource and Earth science, China University of Mining and Technology, Xuzhou 221008, China 刊 名： 科学通报（英文版） SCI 英文刊名： CHINESE SCIENCE BULLETIN 年，卷(期)： 2005 50(z1) 分类号： P61 关键词： coal pore structure fractal classification coal bed meth ane natural classification