镇53 井区长8 段储层是鄂尔多斯盆地镇北地区勘探、评价以及开发的重点地区及层系之一。通 过岩心描述和测井资料分析，认为该油层组为长石质岩屑砂岩，并确定了其主要为三角洲前缘亚相沉积， 主要沉积微相有水下分流河道、河口坝、远砂坝等，其中水下分流河道和河口坝微相相对发育。同时，通过分析沉积微相与储层物性之间的关系，确定了储层物性受沉积微相控制，并认为水下分流河道是主要的有 利沉积微相。

Chang 8 reservoir in Zhen 53 well field is one of the key horizons for exploration, evaluation and development in Zhenbei region, Ordos Basin. Based on core description and well logging data analysis, it is considered that the main sandstone in the studyarea is feldspathic litharenite, and the reservoir ismainlydelta front. Themain sedimentarymicrofacies include subaqueous distributary channel, mouth bar and distal bar. The subaqueous distributary channel sands and mouth bar constitute the dominated reservoir. The relationship between sedimentarymicrofacies and reservoir physical property is analyzed. The result shows that the reservoir physical property is controlled by sedimentarymicrofacies, and the subaqueous distributarychannel is the favorablemicrofacies.