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

摘要： 海拉尔盆地霍多莫尔构造带下降盘南一段沉积时期发育了局限分布的近岸水下扇体沉积，针对其沉积规律认识不够深入的问题，利用岩石薄片、粒度分析、扫描电镜及岩心观察和古地貌恢复等技术手段，通过对霍多莫尔构造带下降盘南一段储层岩石学特征、黏土矿物特征、成岩作用特征、沉积构造特征、沉积相及测井响应特征和地震相特征6个方面的综合分析，总结出其具有成分成熟度和结构成熟度低、成岩欠压实、近距离搬运及快速卸载等特点，提出原始地貌较大的地形高差、靠近物源及沉积期强烈的构造抬升，是形成该区近岸水下扇的主要控制因素。同时，指出油气富集与扇的大小无相关性，主要受相带和砂体发育影响控制，霍多莫尔构造带下降盘南一段的3砂组，沿霍多莫尔断裂发育的近岸水下扇扇中及湖底扇等部位应是下一步勘探开发的主攻方向。

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