石油钻采工艺2024，Vol.46Issue(1)：112-118,7.DOI:10.13639/j.odpt.202310058
压汞法和液氮吸附法在高阶煤孔隙结构表征中的适用性
Applicability of mercury intrusion method and nitrogen adsorption method in characterizing pore structure of high-rank coal
摘要
Abstract
The coal reservoirs in the southern Qinnan Basin are typical high-rank coal reservoirs in China,and they are vital for coalbed methane extraction.The characterization of coal pore structure in this area plays a crucial role in coalbed methane extraction,CO2 sequestration,and the assessment of gas outburst hazards.Samples from the Qinshui Basin were selected,and the pore size distribution and pore morphology of the coal samples were tested and calculated using the mercury intrusion method and nitrogen adsorption method,respectively.The results indicate that compared to mercury intrusion method,the change rate of pore volume measured by nitrogen adsorption method increases slowly with the increase of pore size,and the dV/dlgD-D value corresponding to pore size is low,which better conforms to the characteristics of micro-pores in high-rank coal.By comparing the pore morphology tested by mercury intrusion method and nitrogen adsorption method,and combining the measured pore size values,and combining the measured pore size value with the pore characteristics of high-rank coal in typical mining areas,it was found that the pore shape measured by the nitrogen adsorption method can better characterize the characteristics of micro-pores in high-rank coal.Therefore,the low-temperature nitrogen adsorption method is suitable for characterizing the pore structure of high-rank coal with pore sizes ranging from 5 to 50 nm.These research findings provide theoretical basis and practical experience for finely characterizing pore structure in high-rank coal reservoirs in the southern part of the Qinshui Basin.关键词
压汞法/液氮吸附法/孔隙形态/高阶煤/孔隙结构/孔径分布/表征/沁南盆地Key words
mercury intrusion method/nitrogen adsorption method/high-rank coal/pore structure/pore size distribution/pore morphology/characterization/Qinnan Basin分类
能源科技引用本文复制引用
王睿,冯宏飞,柳长峰..压汞法和液氮吸附法在高阶煤孔隙结构表征中的适用性[J].石油钻采工艺,2024,46(1):112-118,7.基金项目
煤与煤层气共采技术国家重点实验室开放基金"晋城矿区高煤阶构造煤相渗特征及其对煤层气井产能的控制"(编号:2022KF13). （编号:2022KF13）
