关键词: 近岸水下扇, 成因探讨, 南一段, 霍多莫尔构造带, 海拉尔盆地

Abstract: 　Nearshore subaqueous fan is developed with limited distribution during the deposition period of K1N1 member in hanging side of Huoduomoer tectonic zone in Hailar basin. In order to further understand the regularity of its deposition, technical measures such as rock slice, particle size analysis, SEM, core observation and paleogeomorphic restoring are used. According to analyse and research on the feature of petrology and clay mineral, diagenesis, sedimentary structure, sedimentary facies, logging response and seismic facies. Nearshore subaqueous fan has the feature, such as low maturity of texture and component, under⁃compacted diagenesis, short⁃distance transportation and quick sedimentation. The idea is proposed that the mainly control factors of formation about nearshore subaqueous fan are the large terrain elevation difference of original landform, close to the source and strong tectonic uplift during the deposition period. Meanwhile, it is pointed out that the enrichment of oil and gas is nothing to do with the size of fan, it is mainly controlled by the development of the facies belt and sand⁃body. The midfan of nearshore subaqueous fan and sublacustrine fan in the basin which developmented along Huoduomoer fault, are the main areas of the further exploration of K1N1⁃3 sand set reservoir in hanging side of Huoduomoer tectonic zone.

Key words: Nearshore subaqueous fan, Discussion on genesis, K1N1 member, Huoduomoer tectonic zone, Hailar basin