利用测井曲线和岩心资料, 分析了研究区100 余口探井的岩、电特征, 对镇北油田长3 油层组进行了精细划分与对比, 将长3 油层组自上而下划分为长3₁¹、长3₁²、长3₁³、长3₂¹、长3₂²、长3₂³、长3₃¹、长3₃²、长3₃³ 等9 个不同级别的小层, 各小层厚度大致相等。其中长3₂²、3₃¹ 小层为水下分流河道沉积, 砂体发育, 是研究区长3 油层组的主力产油层。长3 油层组的精细地层划分与对比为研究沉积微相、砂体展布、储层非均质性及预测有利含油区块提供了地质基础数据, 对油田开发具有非常重要的意义。

Based on well logs and core data, the characteristics of the rock-electric property of more than 100 wells are analyzed. The fine stratigraphic classification and correlation of Chang 3 reservoir in Zhenbei Oilfield are carried out. From top to bottom, Chang 3 can be divided into Chang 3₁¹, Chang 3₁², Chang 3₁³, Chang 3₂¹, Chang 3₂², Chang 3₂³, Chang 3₃¹, Chang 3₃² and Chang 3₃³. Among them, Chang  3₂² and Chang 3₃¹ are underwater distributary channel deposits, and with sand bodies developed well, they become the dominated reservoirs in the study area. The fine classification and correlation can provide geologic basic data for the study on sedimentary microfacies, sand body distribution, reservoir heterogeneity and favorable target prediction, which takes a significant part in the oilfield development.