阜新凹陷中北段油气成藏主控因素分析及有利目标预测

针对阜新凹陷油气钻探程度低、储层变化大、油气藏分布规律不清等地质问题,通过解剖已钻探的东梁、小胡家和清河门3个典型构造,提出该区油气成藏的主控因素:除烃源条件作为油气成藏的基本控制因素之外,具有良好储集性能的沙海组下段和九佛堂组上段的扇三角洲砂体是阜新凹陷最重要的储集层;早白垩世末期的燕山运动控制构造圈闭的形成,背斜、断背斜或断鼻构造圈闭发育带决定油气藏的分布。从勘探潜力、油气地质条件及成藏规律分析,预测出伊吗图北断鼻圈闭和艾友东断背斜圈闭2个有利勘探目标。

Main controlling factors analysis and favorable targets prediction of hydrocarbon accumulation in central-northern part of Fuxin sag

In view of the geological problems such as low drilling degree,big reservoir variances and unclear distribution of hydrocarbon reservoirs in Fuxin sag,through 3 typical structures analysis of Dongliang.Xiaohujia and Qinghemen,main controlling factors of hydrocarbon accumulation in this area have been proposed.Besides the basic factor of source conditions,the most important reservoirs of good properties are lower member of Shahai formation and upper member of Jiufotang formation.Structural traps formation is controlled by Yanshan movement in later period of early Cretaceous,while the reservoir distribution is determined by trap development zones of anticline,fault- anticline or fault- nose structures.From the analysis of exploration potential,oil and gas geological conditions and reservoir accumulation regularities,two favorable exploration targets,namely north faulted- nose trap in Yimatu and eastern faulted- anticline trap in Aiyoudong.have been predicted.