四川盆地威东–安岳地区须二段储层特征及有利区预测

Reservoir Characteristics and Favorable Regions Prediction of the Second Member of Xujiahe Formation in Weidong-Anyue Area, Sichuan Basin

摘要: 应用岩心铸体薄片鉴定、压汞实验以及孔渗等分析化验资料，对安岳地区须家河组须二段砂岩储集特征进行综合分析。结果表明，须二段砂岩储层的岩性主要以岩屑长石砂岩及长石岩屑砂岩为主，其次有长石石英砂岩及岩屑石英砂岩；储集孔隙类型主要为残余粒间孔、粒内溶孔、其次为铸模孔、晶间微孔；储层的排驱压力高、饱和中值压力高，储集空间类型为细孔微喉型，总体上属于低孔低渗和特低孔特低渗储层。结合储层有效厚度、孔隙度平面分布、已钻井产气情况等，预测出3个须二段储层分布有利区。

Abstract: The sandstone reservoir characteristics of the 2nd member of Xujiahe formation in Anyue area were comprehensively analyzed by core casting slice identification, mercury injection test and porosity and permeability analysis. The results show that the lithology of the 2nd member sand-stone reservoir mainly consists of debris feldspar sandstone and feldspar debris sandstone; fol-lowed by feldspar quartz sandstone and debris quartz sandstone. The pore types of the reservoir are mainly residual intergranular pore, intragranular dissolved pore, followed by mould pore and intercrystalline pore. The displacement pressure of reservoir is high, the median pressure of saturation is high, and the type of reservoir space is micropore type. Generally, it belongs to low porosity, low permeability reservoir and extremely low porosity, extremely low permeability reservoir. Combined with the effective thickness of reservoir, the plane distribution of porosity and the situation of gas production in drilling, it is predicted that there are 3 favorable reservoirs for the 2nd member of Xujiahe formation.