勃利盆地煤岩孔-裂隙特征研究
Study on Pores and Fractures Characteristics of Coal in Boli Basin
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摘要: 为评价勃利盆地煤岩孔-裂隙特征,通过低温液氮吸附、压汞试验、煤岩显微组分和镜质组反射率测定、扫描电镜试验以及手标本描述等实验测试,对勃利盆地3个矿区15件样品的煤岩孔隙、微裂隙、内生裂隙和外生裂隙特征进行了系统研究。结果表明:勃利盆地煤岩显微组分以镜质组为主,含量在80.80%~88.00%之间;壳质组和惰质组含量较少;镜质体反射率在0.77%~1.42%之间;煤岩孔隙以微、小孔为主,孔隙类型为较开放的平行板状孔和圆筒形孔;煤岩中微裂隙较为发育,以张裂隙为主;内生裂隙中端割理线密度为18条/5 cm,面割理线密度为20 条/5 cm,高度为1~8 mm;外生裂隙以NW向为主。Abstract: In order to evaluate the pore fracture characteristics of coal in Boli Basin, this paper, by means of low temperature liquid nitrogen adsorption, mercury injection test, coal macerals and vitrinite reflectance measurement, scanning electron microscope test and hand specimen description, has studied the pore, micro fracture, endogenetic fracture and exogenetic fracture characteristics of 15 samples from three mining areas in Boli Basin. A systematic study was carried out. The results show that the macerals of coal in Boli Basin are mainly vitrinite, accounting for 80.80%-88.00%; the contents of exinite and inertinite are less; the reflectance of vitrinite is between 0.77%-1.42%; the pores of coal are mainly micro pores and small pores, and the pore types are parallel plate pores and cylinder pores; the micro fractures in coal are more developed, mainly tensile fractures; the middle end of endogenetic fractures is cut. The linear density of the cleavage is 18 strips/5 cm, the linear density of the surface cleavage is 20 strips/5 cm, and the height is 1mm-8mm; the main direction of the exogenetic fracture is NW.
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