胜坨油田三区东营组三段储层特征及分类评价

Reservoir characteristics and classification evaluation of the third member of Dongying Formation in the third block of Shengtuo Oilfield

通过岩心观测、岩心薄片、铸体薄片、扫面电镜及压汞资料分析,对胜坨油田三区东营组三段储层微观特征进行了分析研究。论述了储层的岩石学特征、成岩作用及孔隙结构特征。认为储层以粉砂岩为主,储层埋藏较浅地,成岩作用较弱,常见压实、胶结和溶解作用,黏土矿物的转化作用也较普遍,属于早成岩期的B亚期;储层发育粒间、粒内及微裂缝3种孔隙类型;储层孔隙结构可以划分为粗孔粗喉结构、粗孔中喉结构、中孔中喉结构和细孔细喉结构4种类型。在上述研究的基础上,引入"权重"数学方法,将储层层划分为4种类型,即好储层(E)、较好储层(G)、一般储层(M)和较差储层(P),准确地定量表征了储层的优劣。

On the basis of the data analysis of core observation, core wafer, cast thin section, SEM and mercury injection, this paper analyzes the microscopic feature of the third member of Dongying Formation in the third block of Shengtuo Oilgield, and describes the features of petrology, diagenesis and pore structure of reservoir. It is believed that the reservoir is mainly siltstone, with shallow- burial reservoir and weak diagenesis. Compaction, cementation and dissolution are common and the transform of clay mineral is general, which belongs to the B period of early diagenetic period. Three pores, intergranular pore, intragranular pore and fracture, are developed in reservoir. The pore structure can be divided into four types, including large pore with large throat, large pore with medium throat, medium pore with medium throat and thin pore with thin throat. Based on the study above, mathematical method of ＂weight＂ is introduced. 3＂he reservoir can be classified into four types, i.e. the best reservoir（E）, better reservoir（G）, common reservoir （M） and poor reservoir （P）. The accurate quantification characterizes the reservoir quality.