鄂尔多斯盆地W区块沉积相研究

Study on Sedimentary Facies of W Block in Ordos Basin

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。

As sedimentary facies affect the distribution and performance of hydrocarbon reservoir, study on characteristics of different sedimentary facies has important meaning, and provides scientific basis for further exploration. In this paper, characteristics of sedimentary microfacies of Chang 2 reservoirs of Yanchang formation in W block was studied according to core obsercation and thin section identification, logging data and previous research results. The results show that, Chang 2 reservoirs are delta front subfacies deposit, and their main microfacies include underwater distributary channel, tributary bay and channel mouth bar. There is certain continuity from bottom to top in Chang 2 reservoirs.