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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 .0 1 5× 1 0 - 3μm2 ～ 0 .0 93× 1 0 - 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 .0 2 72× 1 0 - 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 first breakthrough in the area of tight sandstone in western Sichuan. The tightness of the upper reservoir of Shaximiao Formation in this area leads to its low evaluation, and the predicted result is different from the actual output. Based on the analysis of reservoir characteristics, especially the permeability of underground fractures and reservoir influencing factors, the reservoir type is mainly fractured - pore type, and the permeability of underground fractures is calculated as0.051 × 10 ~ 3μm2 ~ 0.93 × 10 ~ 3μm2, which contributes about 70% ~ 80% of the effective permeability of the formation, and the lower limit of matrix permeability is only 0. 0 2 72 × 10 ~ 3μm2. The geology that controls the development of favorable reservoirs The main factors are sand body microfacies and fracture development. Synthetically, the distribution of sandstone microfacies, structural curvature, pressure distribution and other factors have been used to predict and evaluate the distribution of favorable reservoirs.