松辽盆地北部朝长地区扶余油层油气来源及成藏特征

分析朝长地区扶余油层的油气来源,并对成藏特征进行系统总结,预测油气有利勘探区,为该区勘探部署提供了理论支持.应用烃源岩评价、油源对比技术分析了油气来源；应用流体势恢复、疏导体分析、油水关系、油藏类型分析及成藏主控因素分析等多种方法对扶余油层的成藏特征进行研究.研究结果表明:朝长地区扶余油层中的原油主要来自三肇凹陷与宾县—王府凹陷2个高势区的成熟源岩,在流体势的作用下,油气通过南西—北东向展布的砂体与近南北向分布的断裂带侧向运移到低势的朝长地区,该区整体呈现上油下水特征,源储压差决定油柱高度,正向构造背景控制油气富集.扶余油层河道砂体是有效储层,控制了油气藏的分布.该区主要发育构造、岩性-构造、岩性、断层-岩性、构造-岩性共5种油气藏类型,存在自源超压上生下储短距离垂向运聚、近源常压-负压中距离侧向运聚2种成藏模式.

Oil and gas source and reservoir characteristic of Fuyu Reservoir of Chaochang area in north Songliao Basin

Oil and gas origin of Fuyu oil layer of Chaochang area was analyzed,characteristics of hydrocarbon were summed up,and favorable exploration areas of Reservoir of Chaochang area were forecasted during synthetical studying,which provided theory support for exploration.Oil and gas origin was analyzed by the research of hydrocarbon source rocks evaluation and the oil-source rock correlation.The Fuyu layer Reservoir-forming characteristics was studied by resuming the fluid potential and analysis,hydrocarbon transporting system,oil-water relationship,reservoir types and main controlling factors of hydrocarbon accumulation.The research displays that the crude oil of Fuyu layer in Chaochang area is mainly coming from Sanzhao and Binxian-Wangfu Depression’s mature source rock which are high fluid potential Field.Fluid potential indicates that Chaochang area is lower Fluid Potential Field.It is benefit to the oil and gas migration to this area by sand(north-east direction) and default zone(south-north direction).The oil and water analyses display that the oil is in the upper of Reservoir and the water is in the lower of Reservoir,pressure difference between Source Rocks with Reservoirs decides oil column height,positive tectonic controls oil and gas accumulation.The fluvial channel sand is efficacy reservoir,and controls the distribution of oil and gas.The Fuyang reservoir type has tectonic,lithologic-tectonic,lithologic,default-lithologic and tectonic-lithologic oil pool.There are two types of Patterns of Hydrocarbon,one is the near source over pressure,the source over the reservoir,short distance,vertical-migration;the other is near source constant pressure-negative pressure middle distance across the range migration.