河东煤田白额勘探区煤储层渗透性及其影响因素

Coal Reservoir Permeability and Its Contributing Factors in Baie Exploration Area,Hedong Coalfield

渗透性是煤储层的重要参数之一,是煤层气勘探选区的重要条件。通过分析白额勘探区煤层中的孔隙、裂隙、煤岩类型、变质程度、埋藏深度和有效应力等对煤储层渗透性的影响,认为本区煤储层孔隙以大孔为主,过渡孔次之,微孔及中孔所占的比例最低,属过渡型孔隙类型;10#煤层裂隙较发育,2+3#煤层裂隙欠发育,裂隙发育程度与煤储层渗透性正相关;煤层渗透性与有效应力、埋深呈负相关性;显微煤岩组分中以均质镜质体为主的煤储层(10#)比以基质镜质体为主的煤储层(2+3#)的渗透性高。

The permeability is one of important parameters of coal reservoir,and a major consideration in CBM exploration target selection.Analyzed impacts from pore,fissure,coal lithotype,degree of coal metamorphism,buried depth and effective stress on coal reservoir permeability in the Baie exploration area,considered that coal reservoir pores are mainly large pores,transitional pores the second,proportions of micropore and medium pore the lowest,thus belong to transitional pore type.Fissures are well developed in coal No.10,under developed in coal No.2+3,degree of fissure development presents positive correlation with coal reservoir permeability;coal seam permeability presents negative correlation with effective stress and buried depth.The permeability of mainly homocollinite coal No.10 reservoir is higher than mainly desmocollinite coal No.2+3 reservoir.