高尚堡油田致密砂岩储层敏感性评价

在高尚堡油田沙三2+3亚段Ⅴ油组致密砂岩油藏储层特征研究的基础上,结合储层敏感性流动实验分析,探讨了致密砂岩储层敏感性和敏感成因。结果表明,储层具有中等偏强盐敏–强盐敏、中等偏弱–中等偏强速敏、中等偏弱–中等偏强水敏、中等偏弱–中等偏强碱敏、弱–中等偏弱酸敏的特征;研究区优势储层以水下分流河道和河口坝砂体为主,储层的泥质含量高、层内非均值性强、渗透率低、孔隙结构复杂是造成储层敏感性强的主要原因;伊/蒙混层和高岭石的相对体积分数较高,进一步加强了储层的盐敏性、水敏性和速敏性。

Sensitivity evaluation of tight sandstone reservoirs in Gaoshangpu oilfield

Based on the study of reservoir characteristics of tight sandstone reservoir of Es_3~(2+3)Ⅴ oil formation in Gaoshangpu oilfield, combined with the experimental analysis of reservoir sensitivity flow, the sensitivity and sensitivity genesis of tight sandstone reservoirs are discussed. The results show that the tight reservoirs in the study area are characterized by moderate-plus to strong salt sensitivity, moderate-minus to moderateplus velocity sensitivity, moderate-minus to moderate-plus water sensitivity, moderate-minus to moderateplus alkali sensitivity, and weak to moderate-minus acid sensitivity. The dominant reservoirs in the study area are mainly underwater distributary channel and mouth bar sand bodies. The high shale content, strong heterogeneity, low permeability and complex pore structure are the main reasons for the strong reservoir sensitivity. The relative volume fraction of illite/montmorillonite and kaolinite is higher, which further enhances the salt sensitivity, water sensitivity and velocity sensitivity of the reservoir.