针对四川盆地长宁—威远页岩气示范区志留系龙马溪组泥页岩吸附气量大(70,~80,)的特性，对该页岩气区11口井龙马溪组优质页岩段的岩心样品作X射线衍射分析、扫描电镜和等温吸附分析测试，结合大量泥页岩含气量实测数据，统计分析及评价表明：研究区地层因素中，生烃条件如总有机碳含量(0.17,~4.3,)、有机质类型(Ⅰ、Ⅱ1型)和成熟度(2.4,~3.0,)，以及储层条件如矿物成分、孔隙体积(3,~6,)、孔隙结构(中孔为主)和湿度，主要是通过改变页岩气生成量和吸附活性表面的大小而产生影响；外部因素如温度和压力主要是通过改变气体分子的活化能和结合能而对泥页岩吸附能力产生一定的影响。

According to rock analysis of X- ray diffraction, scanning electron microscopy and isothermal adsorption experiments on Lower Silurian Longmaxi shale cores samples from 11 gas wel s in Changning-Weiyuan area in the southern part of Sichuan Basin, the adsorptivity and its influential factors are statistical y analyzed. Combined with a large number of measured data of gas content in shale, it is shown that stratigraphic factors commonly exert their influences on adsorption through changing the gas generation amount and the extent of adsorbing active surface area in shale. The stratigraphic factors mainly include hydrocarbon generation conditions such as TOC(0.17,~4.3,), type of organic mat er (Type-Ⅰor Type-II1) and maturity(2.4,~3.0,), and reservoir conditions such as mineral composition, pore volume(3.0,~6.0,) and structure(mostly mesopores) and humidity. External factors, such as pressure and temperature, exert their definite influences on the adsorption capacity of Longmaxi shale through changing activation energy and binding energy of gas moleculars.