基于压汞实验的煤孔隙系统分形分类

Fractal Classification of Coal Pore System Based on Mercury Injection Experiment

基于9个煤样的常规压汞测试，绘制了各个煤样In（dSPr／dPr）和lnPr的散点图。在此基础上，结合分形理论，根据散点图在各个阶段的不同趋势特征，定量划分了煤中的微小孔，过渡孔和大孔。研究结果表明，半径小于75．6nm的孔为微小孔，半径为75．6～512．8nm的孔为过渡孔，半径大于512．8nm的孔为大孔。三类孔的孔容百分比数据表明孔隙系统主要由微小孔组成，其孔容百分比一般高于70％；Y3，Y4，Y5和Y6的过渡孔和大孔的孔容百分比约为30％，其渗流能力最强。

Based on the conventional mercury injection test of nine coal samples, the In （dSPr/dPr） and lnPr scatter plots of each coal samples were drawn in the paper. Based on the circumstances, in combination with the fractal theory, according to the different tendency features of the each stage in the scatter plots, the micro pore, transition pore and macro pore in the coal were quantitatively divided. The study results showed that the pore with a radius less than 75. 6nm would be the micro pore, the pore with a radius of 75. 6 - 512. 8 nm would be a transition pore and the pore with a radius over 512. 8nm would be a macro pore. The percentage data of the three pore volumes showed that the pore system was mainly consisted with the micro pores and the percentage of the pore volume would be 70% higher than others. The pore volume percentages of the Y3, Y4, Y5 and Y6 transition pores and macro pores would be about 30% and the vadose capacity was the best.