沉积相控制着油气储集层的分布和储集性能,研究各类型沉积相特点,不但在理论上具重要的意义,而且为下一步的勘探开发可提供更好的指导依据。通过岩心观察和镜下薄片鉴定的结果与测井资料,结合前人的研究成果,对W区块长2段沉积相特征进行研究。结果表明:W区块长2油层组为三角洲前缘亚相沉积,主要的沉积微相为水下分流河道、分流间湾与河口坝。长2油层组由下至上沉积具有一定的继承性。 Sedimentary facies controls the distribution and reservoir performance of oil and gas reservoirs. Studying the characteristics of various sedimentary facies not only has theoretical significance, but also provides better guidance for further exploration and development. Based on the results of core observation and microscopic identification and logging data, combined with the previous research results, the characteristics of sedimentary facies of the 2nd member of W block are studied. The results show that the Chang 2 reservoir of W block is delta front sedimentary facies, the main sedimentary microfacies are underwater distributary channel, inter-bay and estuary dam. Chang 2 reservoir from bottom to top sediment has some succession.