华北重点矿区煤储层吸附特征及其影响因素

研究华北地区煤储层吸附特征及主要影响因素，对9个重点矿区42件煤样进行了平衡水法等温吸附分析．实验表明：研究区原煤兰氏体积在6．22～43．57m^3／t之间，分布特征受区域煤变质的三带分布规律控制，在中带的沁水盆地最高，焦作、安鹤、永夏和荥巩煤田其次，而在南、北两带的平顶山、大同和两淮地区最低；全区域兰氏压力在0．20～3．83MPa之间，以大同和沁水最高，平顶山次之，其他矿区较低．研究表明，煤级是影响该区煤储层吸附能力的主要因素，随煤级增大，煤储层吸附能力呈多项式关系增强．煤吸附能力随煤中镜质组和惰质组含量总和的增高而增强，其中惰质组的影响较大．煤储层吸附能力随煤中碳组分含量的增高和氢组分含量的降低而增高．煤中水分和灰分的存在会降低煤的吸附性能．

Adsorption Characteristics of Coal Reservoirs in North China and Its Influencing Factors

Based on the analysis of 42 coal samples from 9 coalfields in North China,the meth-ane adsorption characteristics and its influencing factors were studied.The results show that,in North China,the Langmuir volume(Vl) of raw coal with equilibrium moisture basis is from 6.22 to 43.57 m3/t,and its distribution is strongly controlled by depositional zones in North China.The optimal area are Qinshui basin,and sub-optimal areas are respectively Jiao-zuo,Anhe,Yongxia and Xinggong coalfields in middle zone.The low-value areas are Datong,Pingdingshan,Huainan and Huaibei coalfields in northern and southern zones,respectively.The Langmuir pressure ranges from 0.2 to 3.83 MPa,the highest in Datong and Qinshui,higher in Pingdingshan and the lowest in other areas.The coal rank is a dominant factor influ-encing adsorption capacity,which increases in polynomial correlation with coal rank.The ad-sorption capacity increases with the increasing of the sums of vitrinite and inertinite content,and in which the inertinite content play a dominant role.The adsorption capacity also increases with the increasing of carbon content and decreasing of hydrogen content.Additionally,the ex-istence of moisture and ash in coals can result in the decreasing of methane adsorption capacity.