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孝泉气田是在川西致密砂岩领域首先取得突破的地区。该区沙溪庙组上部储层特有的致密性致使其评价较低，预测结果与实际产出状况相差悬殊。本文通过对储层特征、尤其是地下裂缝渗透率和储层影响因素分析，确定其储集类型以裂缝-孔隙型为主，计算其地下裂缝渗透率为0.015×10-3μm2～0.093×10-3μm2，对地层有效渗透率的贡献约为70％～80％，基质渗透率下限仅需0.027 2×10-3μm2，控制有利储层发育的地质因素主要有砂体微相和裂缝的发育程度。综合砂体微相分布、构造曲率、压力分布等因素对有利储层展布进行了预测评价。“,”Xiaoquan gas field is the area of first making a breakthrough in natural gas exploration in the tight sandstone in West Sichuan. In the area, the grade of the evaluation of the upper reservoir of Shaximiao Formation is relatively low because of its special tightness and the result of reservoir prediction was greatly different from the reality production circumstance. Through analyzing reservoir characteristics, specially underground fracture permeability and the factors of controlling favorable reservoirs, it is determined that the type of reservoir is mainly fracture-pore type. The underground fracture permeabilities calculated are 0. 015 × 10 3 ～ 0. 093 × 10 3μm2, however, their contribution to effective permeabilities is 70 ～ 80% and only a cutoff matrix permeability of 0. 0272 × 10 - 3μm2 is necessary for commercial reservoir. The major geological factors of controlling favourable reservoir growing are the sandbody microfacies and the degree of fracture growing in the sandbodies. Through comprehensively analyzing these factors as sandbody microfacies, structural curvature and formation pressure, etc., the distribution of favourable reservoirs is predicted and evaluated in the paper.