Influence of igneous intrusion on micropore characteristics of coal reserves in Huaibei coalfield
Abstract：The measured vitrinite reflectance（Ro）,low-temperature nitrogen gas adsorption,carbon dioxide adsorption and scanning electron microscopy（SEM） analyses were carried out with 23 fresh samples from Wolonghu and Haizi Mine of Huaibei coalfield at various distances from two sills was done.Comparative analysis of the relation between micropores（micropore surface area,micropore volume and average micropore diameter） and the BET surface area of coal seams and the distance from sills was done.The results show that Ro levels of the Wolonghu coal increases from 2.74% to 5.03% near the sill.Approaching the intrusion,Ro levels of the Haizi coal increases from 2.30% to 2.78%.It is concluded that the contact-metamorphism of the sill in the Wolonghu Mine decreases the micropores and the BET surface area of coal（0~5 m from sill）,while the thermal evolution of sill increases it of coal（5~60 m from sill）,and the thermal evolution of sill in the Haizi Mine increases it of coal（60~160 m from sill）.The scanning electron microscopy found massive devolatilization vacuoles of coal in the thermal evolution zone.
Keywords：igneous intrusioncoal reservesmicroporeBET surface areathermal evolutionscanning electron microscopy
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 634-640 )