赵庄井田3号煤孔隙特征研究

Study on Characteristics of the No.3 Coal Porein Zhaozhuang Well-field System

煤孔隙特征对煤层气赋存和运移具有关键作用,是煤层气勘探开发的重要基础理论和研究热点之一。为了研究赵庄井田3号煤孔隙特征,采用低温液氮吸附试验。结果表明:受多地质因素影响,不同样品煤孔隙特征表现出显著的分形现象,孔隙系统相对复杂、形态多样、连通性和渗透性较差;不同尺度孔隙均有发育,介孔最为发育,微孔和大孔发育一般;介孔的孔比表面积占绝大部分,微孔次之,大孔最小;孔容仍以介孔为主,大孔次之,微孔最小。

Coal porosity plays a key role in the occurrence and migration of coalbed methane(CBM),and is one of the important basic theories and research hotspots in CBM exploration and development.In order to study the No.3 coal pore characteristics of Zhaozhuang Mine Field,a low temperature liquid nitrogen adsorption test was carried out.The results show that under the influence of many geological factors,the pore characteristics of different samples show obvious fractal phenomenon,the pore system is relatively complex,the morphology is diverse,the connectivity and permeability is poor,the pores of different scales are developed,and the meso-pores are the most developed,micropores and macropores are generally developed,the specific surface area of Mesopore is the most,the micropores are the second,the macropores are the smallest,the pore volume is still dominated by Mesopore,the macropores are the second and the micropores are the smallest.