荣兴屯地区古近系油气成藏主控因素分析

Analysis of Mainly-controlling Factors of Hydrocarbon Accumulation in the Paleogene System of Rongxingtun Area of East Sag,Liaohe Depression

荣兴屯地区古近系剩余资源潜力需要进一步激活,油气成藏主控因素认识不清楚成为制约对其深化勘探的重要因素。通过地震、钻测井与测试等资料,并结合构造格局、沉积体系发育特征以及已探明油气藏的产出情况等的分析,总结油气成藏的基本条件,探讨其油气分布的控制因素。阐明了其油气成藏条件总体良好,油气聚集复杂多变,油气藏受烃源、断裂及储集层等主要因素控制,而各控制因素在油气分布中的作用不尽相同,有效烃源岩及局部正向构造控制了油气分布范围,储集层控制了油气的富集程度,油气形成和聚集与断裂具有高度的相关性,主级断裂控制了油气藏形成,次级断裂调整了油气分布格局,复杂断裂体系与不同类型的储盖组合综合控制了油气纵横向分布。

The residual potential resources of the Paleogene System needed to be further activated in the Rongxingtun Areas of Eastern Sag, Liao Depression, it not clear for the main controlling factors of hydrocarbon accumulation has already become the important factor to restrict its deepening exploration. Through seismic, drilling and well logging and testing data, and combined with the feature of structural pattern, sedimentary development as weli as the output of the proven hydrocarbon reservoirs, the basic conditions of hydrocarbon accumulation were snmmarized, the controlling factors of hydrocarbon distribution are discussed. The result demonstrated that the entire hydrocarbon accumulation conditions are good, hydrocarbon accumulation is complicated and various, and reservoirs are mainly controlled by the source, fracture and reservoir formation. These factors will play different roles on the hydrocarbon accumulation, it will tend to be as following situations the effective hydrocarbon source rocks and local forward structure control the hydrocarbon distribution scope, reservoir formations control the hydrocarbon enrichment degree, hydrocarbon formation and accumulation will highly related with the fractures, moreover, the principal faults control the reservoir formation, and the secondary fractures will adjust the hydrocarbon distribution pattern, and the complex fracture system and the different types of combination of the reservoirs and caprocks will comprehensively control the vertical and horizontal distribution of hydrocarbon.