三塘湖盆地牛圈湖区块微观孔隙结构对注水开发的影响

Influence of microscopic pore structure on water flooding development in Niujuanhu block of Santanghu basin

通过分析铸体薄片、扫描电镜、高压压汞、恒速压汞、可视化岩心水驱油等实验资料,结合生产动态资料,研究了储层岩石学特征差异、成岩作用差异、孔隙类型差异及其连通程度、孔喉配置关系、孔喉比、微裂缝等储层微观因素对三塘湖盆地牛圈湖区块注水开发效果的影响。结果表明,研究区三个区块孔隙类型单一,均以大孔隙为主,而喉道类型差异大,喉道差异是导致区块之间注水效果差异大的主要原因。

Through the analysis of the casting thin sections,scanning electron microscopy(sem),high-pressure mercury injection and constant velocity mercury injection,visualized water and oil displacement experiment data,combined with production performance data,the influences on waterflood development on Niujuanhu block of Santanghu basin,such as reservoir petrology characteristic differences,the difference of diagenesis,pore types and its connected degree,the relationship between the pore configuration,pore throat ratio,microfracture reservoir microscopic factors has been carried out.The results show that the 3 blocks in the study area are of single pore type,with big pores and big throat types difference.The throat difference between blocks is the main reason for large difference of water injection effect.