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低弯度分流河道砂体在大庆油田北部萨葡油层中占有重要比例，深入研究这类砂体的非均质特征，对油田调整挖潜具有实际意义。以沉积学知识为指导，应用密井网的测井资料和取心资料，结合微相平面展布组合特征识别出主河道、废弃河道、决口水道、河间薄层砂、泥岩等五种主要微相，并应用水淹层解释及各种动态监测资料开展了水淹变化特征研究。认为砂体层内非均质性，窄条带的河道砂体几何形态及微相间的物性差异是影响平面及纵向水淹变化特征的主要因素；随着注水开发时间的延续和强度的增加，不同微相水淹面积和水淹程度变化各不相同；剩余油主要分布在远离注水井的决口水道和河道间砂体中。
The low-curvature distributary channel sand bodies occupy an important proportion in the Sapud reservoir in the northern part of Daqing Oilfield. In-depth study on the heterogeneity of these sand bodies has practical significance for adjusting and tapping the potential of oilfields. Using the knowledge of sedimentology as a guide, the logging data and coring data of the dense well network are combined with the characteristics of the plane distribution of the microfacies to identify the five main types of the main river channel, abandoned river channel, bursal outlet channel, thin river sand and mudstone Microfacies, and the application of water flooded layer interpretation and a variety of dynamic monitoring data to carry out the characteristics of flooding change. It is considered that the heterogeneity of sandstone layer, the geometry of narrow channel sand body and the difference of physical properties between microfacies are the main factors affecting the characteristics of horizontal and vertical flooding. With the development of water injection and the increase of intensity, Different microfacies have different flooding area and flooding extent. The remaining oil mainly distributes in the bursting channel and inter-channel sand body far away from the injection well.