【摘要】 目的：建立二连盆地三角洲沉积相模型，确定盆地油气勘探重要领域。方法：利用大量钻井剖面、地震资料、岩性分析、测试成果、岩心观察和油气显示资料进行综合分析，研究了二连盆地30个凹陷中扇三角洲的形成背景和沉积特征。结果：二连小型断陷湖盆陡岸形成的扇三角洲砂砾岩体具有多物源、近物源、粗碎屑和以牵引流成因为主的沉积和构造特征，发育了扇三角洲平原3个沉积亚相和10种沉积微相，建立了沉积相模型。结论：前缘水下河道微相储层含油性最好，是断陷湖盆油气勘探的重要区带。更多还原

【Abstract】 Based on a lot lithologic section,seismic data, Petrological analysis, test result, about thousand meter core observation and oil-gas showings and so on,comprehensive researh results show that fan delta sandstone-conglomerate bodys, formed on abrupt shore of small-scale down-faulted lake basin in Erlian Basin, have mtilti-source, near source, coarse fragment and sedimentary structure features of mainly on gensis of traction current and second on of gravity flow, it developed fan delta plain and so on three sub facies and ten micro facies. Finally summarized sedimentary features of fan delta, facies medle by built. This paper pointed out that reservoir oil bearing nature of front subwater channel micro facies is best,it is important domain oil-gas exploration in downfaulted lake basins.更多还原