Abstract: 　Hongqi depression in Hailar basin is still in the early stage of exploration. There is no clear understanding of the main types of sedimentary systems, their plane distribution characteristics and the types of dominant reservoir facies belts developed in Nantun formation. Based on seismic, core, mud logging and logging data, the main types of sedimentary systems and their plane distribution characteristics in Nantun formation in Hongqi depression are analyzed in detail under the regional tectonic background. It is considered that fan delta, lake fan and lake are the main types of sedimentary systems, among which fan delta deposits are mainly developed in the west side. In Hongxi steep slope zone and eastern gentle slope zone, the development range is relatively small. In the process of advancing the front sand body, the fault slope break zone collapsed, forming a subsea fan sedimentary system at HS6 wells. The lake sedimentary system mainly developed in the depression area between the western steep slope zone and the eastern gentle slope zone. By analyzing the physical characteristics of core samples of different microfacies types, it is found that the subaqueous distributary channel in fan delta front and braided channel in lake fan are the most favorable oil and gas reservoir facies belts, followed by the distributary channel microfacies in fan delta plain.

Key words: Hailar basin, Hongqi depression, Nantun formation, Sedimentary system, Dominant reservoir facies zone

摘要： 综合运用了地震、岩芯、录井、测井等方面的资料，在区域构造背景下详细地分析了红旗凹陷在南屯组沉积时期主要发育的沉积体系类型及其平面展布特征，认为研究区主要发育有扇三角洲、湖底扇及湖泊三种类型的沉积体系，其中扇三角洲沉积主要发育在西侧的红西陡坡带内，东侧缓坡带内发育范围较小，前缘砂体向前推进过程中遇断裂坡折带发生滑塌，在HS6等井区处形成湖底扇沉积体系，湖泊沉积体系主要发育在西侧陡坡带和东侧缓坡带间的洼槽区内。对不同微相类型岩芯样品的物性特征进行分析发现，扇三角洲前缘水下分流河道和湖底扇中扇辫状沟道微相物性特征好，是最有利的油气储集相带；扇三角洲平原分流河道微相次之，为较有利的油气储集相带。

关键词: 海拉尔盆地, 　红旗凹陷, 　南屯组, 　沉积体系, 　优势储集相带