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

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