白家海凸起三工河组一段（J₁ s₁）及二段（J₁s₂）是侏罗系重要的勘探目的层。文中利用铸体薄片图像分析、扫描电镜、压汞分析等技术手段，对J₁s₁、J₁s₂的孔隙结构特征进行了系统分析。J₁s 孔隙类型以剩余粒间孔和次生溶蚀孔为主，喉道类型以片状、弯片状及管束状为主。根据孔隙结构特征参数统计结果，将喉道划分为5 类，J₁s₂储层以Ⅱ类、Ⅲ类喉道为主；J₁s₁储层以Ⅲ类喉道为主。沉积作用和成岩作用是影响研究区储层物性的主要因素，且成岩作用中的胶结作用和溶蚀作用的影响最大。

The first and second members of Sangonghe Formation in Baijiahai area are the important exploration target zones. The cast thin section, scanning electronic microscope, cast image analysis and mercury injection analysis are applied to analyze the pore structure of Sangonghe Formation reservoir in Baijiahai area. The main pores of Sangonghe Formation are residual primary intergranular pore and secondary dissolved pore. The throat types are lamellar or curved lamellar and bundle tubular. Based on the result of pore structure calculation, the throats are divided into five types. The throats of the second member of Sangonghe Formation are mainly typeⅡ and Ⅲ, and the throats of the first member of Sangonghe Formation are type Ⅲ throat. The main influencing factors of the pore structure are sedimentation and diagenesis, and the cementation and dissolution are dominant factors.