孤岛油田储层微观结构特征及其影响因素

Characteristics and affecting factors of reservoir microstructures in Gudao oilfield

在岩石薄片、铸体薄片、扫描电镜和压汞资料分析的基础上 ,对孤岛油田储层微观结构进行全面研究 ,将馆上段储层的孔隙结构分为 4种类型。研究表明 :馆上段储层以 , 类孔隙结构为主 ,微观非均质性严重 ;沉积环境和成岩作用是影响储层微观结构的主要地质因素 ;长期注水开发在一定程度上改善了储层微观结构。认为孔隙结构的非均质性是影响孤岛油田驱油效率的主要因素。

On the basis of observation and analysis of rock sections, cast sections, ESM and mercury injection curves, etc. a systematic study is given on the characteristics of microstructure of reservoir formation in Gudao oilfield, and four types of the reservoir pore structures are presented. The results show that the reservoir pore structures are mainly typeⅡ and typeⅢ, and micro heterogeneity of the reservoir formation is distinct. Sedimentary environment and diagenesis affected the microstructure which has been improved by injecting water development. The heterogeneity of pore structures is a mainly affecting factor of oil displacement efficiency.