苏里格气田苏39区块下石盒子组盒8段储层综合评价

Comprehensive evaluation of He 8 reservoirs of Lower Shihezi Formation in Su 39 block of Sulige Gas Field

苏里格气田苏39区块作为新的开发区域,分析化验资料少,主要含气层位下石盒子组盒8段储层特征认识不明确。该区储层埋藏深,隔夹层发育,有效气层厚度薄,横向差异变化快,空间连通性差,有效储层识别难度大。为开展系统的分析研究,指导制定下步开发方案,针对地质概况、储层岩石学、物性、孔隙结构和渗流特征,开展大量的岩心实验分析,综合运用常规薄片、铸体薄片、核磁共振、扫描电镜、敏感性、相对渗透率、高压压汞等实验技术手段,对苏里格气田苏39区块盒8段储层进行综合评价,并对盒8段3个主力产气段进行分类评价。结果表明,盒83段为Ⅰ类储层,盒81段和盒86段为Ⅱ类储层,可为下步区域开发提供有利的目标。

As a new development region,Su 39 block of Sulige Gas Field has few analytical and laboratory data,and the characteristics of He 8 reservoirs of Lower Shihezi Formation,the main gas⁃bearing horizons,are not clearly understood.In this region,the reservoirs are deeply buried,the barrier⁃intercalation are developed,the effective gas reservoir thickness is thin,the lateral difference changes quickly,the spatial connectivity is poor,and the effective reservoir identification is difficult.In order to carry out systematic analysis and study for making next development plans,analysis of a large amount of cores has been carried out based on the geologic aspects,reservoir petrology,physical properties,pore structure and percolation characteristics.By comprehensive use of experimental technical methods such as conventional thin section,cast thin section,NMR,SEM,sensitivity,relative permeability,and high⁃pressure mercury intrusion,etc.,He 8 reservoirs of Su 39 block in Sulige Gas Field were comprehensively evaluated,and the three major gas⁃producing reservoirs of He 8 Member were classified and evaluated.The results show that He 83 is classⅠreservoir,and He 81 and He 86 are classⅡreservoirs,which can provide favorable targets for the future regional exploration.