榆神府矿区富油煤多尺度孔隙结构特征

利用富油煤提油炼气是弥补我国油气供给不足的重要措施，而富油煤的孔隙发育特征及其渗透能力等方面的研究是开发利用富油煤的基础工作。以榆神府矿区富油煤为研究对象，采用低温液氮吸附法、压汞法、核磁共振法以及气渗透法等多元手段对富油煤多尺度孔隙结构进行分析，并开展富油煤全段孔隙表征研究。基于富油煤多尺度孔隙结构测试结果，开展富油煤孔隙特征与传统低阶煤样差异性讨论。结果发现:榆神府矿区富油煤微小孔隙极为发育，占比高达70%以上，大孔、中孔发育相对不足，仅占总孔隙的25%~30%；核磁共振结果与低温液氮吸附法、压汞法联合表征结果对比发现，联合低温液氮吸附法与压汞法可较好地表征煤样全段孔隙；相较于传统低阶煤，富油煤具有较大的孔比表面积与低温氮吸附量，分别为27.48 m2/g、40~50 cm3/g，具备富油煤提油炼气的良好物性条件。 

Experimental study on multi-scale pore structure characteristics of tar-rich coal in Yushenfu mining area

Extracting oil and refining gas from oil-rich coal is an important measure to make up for the shortage of oil and gas supply in China. The research on pore development characteristics and permeability of tar-rich coal will help to better develop and utilize tar-rich coal. Taking the tar-rich coal in Yushenfu mining area as the research object, this paper studies the multi-scale pore structure and the whole segment pore characterization of tar-rich coal by such methods as low-temperature liquid nitrogen adsorption, mercury intrusion porosimetry, nuclear magnetic resonance and gas permeability measurement method. Based on the test results of multi-scale pore structure of tar-rich coal, this paper discusses the differences between the pore characteristics of tar-rich coal and traditional low-rank coal. The results show that the micropores of tar-rich coal in Yushenfu mining area is extremely well-developed, accounting for over 70% of the total pores, while the macropores and mesopores are relatively underdeveloped, accounting for only 25%-30%. By comparing the results of the nuclear magnetic resonance test with the combined characterization results of low temperature liquid nitrogen adsorption and mercury intrusion porosimetry, it is found that the latter can better characterize the whole segment pores of coal samples. Compared with traditional low-rank coal, tar-rich coal has a larger pore specific surface area of 27.48 m2/g and low-temperature nitrogen adsorption capacity of 40-50 cm3/g, providing an advantage to extract oil and gas for tar-rich coal.