Fractal Characterization of Seepage-Pores of Coals from China: an Investigation to Permeability of Coals
To better understand the seepage-pores (pore diameter larger than 100 nanometers) characteristics of coals and their influence on the permeability of coals, we have conducted fractal analyses for 34 fresh coal samples (mean maximum vitrinite reflectance Ro from 0.43％ to 4.21％) from North-, Northwest- and Northeast China. Analyzing the data from mercury porosimetry indicates that coals are fractal at the pore diameter ranging from 0.1 to 500 μm. The values of calculated fractal dimensions are from 2.61 to 2.98.The fractal dimension has a negative correlation with the petrologic permeability of coals, and this relationship is particularly fitted well for higher rank coals (coals with 1.47-4.21％ Ro) where a strong negative linear correlation (r2=0.85) is observed. Further investigation indicates that fractals of coals are essentially related to rank, component, and pore structure of coals. Fractal dimensions changes versus coal rank show the U-shaped trend, with a minimum occurring in the 1.1-1.3％ Ro. The sub-bituminous, high volatile bituminous, semi-anthracite and anthracite have higher fractal dimensions. It is suggested that the effects of rank upon fractal dimensions are mainly due to the variety of micropores contents and moisture contents during the coalification process.
Yanbin Yao Dameng Liu Dazhen Tang Shuheng Tang Yao Che Wenhui Huang
School of Energy Resources, China University of Geosciences, Beijing 100083, China
国际会议
The 12th Conference of the International Association for Mathematical Geology(第12届国际数学地质大会)
北京
英文
415-420
2007-08-26（万方平台首次上网日期，不代表论文的发表时间）