中文摘要：

致密砂岩气资源评价方法的选取与参数的确定对客观认识致密气的资源潜力至关重要。通过分析各种资源评价方法的优缺点，选取容积法，结合致密储层特征确定了致密界线和含气饱和度两个关键参数。结果表明，容积法是评价致密砂岩气资源潜力可信度较高的方法，但参数的准确求取需结合致密储层的特征；致密砂岩储层具有喉道细小、亲水性强和束缚水含量高等特点，而且渗流能力由喉道大小控制，亲水性受具体粘土矿物成分与含量控制，但不受粘土总量控制；伊利石含量越高，岩石的润湿角越小，亲水性就越强，而绿泥石刚好相反；天然气的浮力与毛管力之间的平衡关系可确定致密储层物性界线，该界线受地层倾角影响明显，从盆地中心到边缘临界致密界线逐渐变小；伊利石表面强吸附水形成的双电层具有较强的导电能力，使传统的阿尔奇公式不适合致密砂岩含气饱和度的解释。而印尼公式充分考虑了泥质含量的影响，更适合于致密储层含气饱和度的解释。

英文摘要：

Selection of methods and relevant parameters is crucial for estimation of tight gas resources .The volumetric method was selected in this paper based on analysis of the advantages and disadvantages of different evaluation methods and relevant two key parameters were defined ,namely tightness limit and gas saturation .The results show that volumetric method is the most reliable method to evaluate tight gas resource potential .However,the accurate determination of rele-vant parameters should be based on the features of tight sandstone reservoir .Tight sandstone reservoirs are generally cha-racterized by small throat ,strong hydrophilicity and high bound water saturation .The size of throat controls the permeabi-lity.Hydrophilicity is controlled by clay mineral components and their contents rather than the total amount of clay mine -rals.The higher content of Illite is ,the smaller the wetting angle is and the stronger the hydrophilicity is .The contrary is true for chloride .The balance relationship between gas buoyancy and capillary force determines the limits of reservoir properties,which is significantly influenced by wetting angle .The critical tightening limit progressively decreases from central to edge of the basin .Electric double layer formed by the strong adsorption water on Illite surface has strong con-ductivivity ,which makes the Archie formula not suitable for the interpretation of tight gas saturation .While Indonesia ’ s formula fully takes the influence of shale content into consideration ,thus is more suitable for determining gas saturation of tight sandstone reservoir .