东营凹陷新近系馆陶组油气成藏条件分析

胜利油区新近系河流相广泛发育,储藏了丰富的油气资源。通过对比分析东营凹陷和沾化凹陷馆陶组地层的沉积、构造背景、油气生成和运聚条件,探讨了两个凹陷馆陶组油气成藏潜力的差异,认为受盆地构造沉降影响,沾化凹陷可容空间变化较东营凹陷大,从而造成沾化凹陷馆陶组水体较深、地层较厚,砂体非均质性强。由于古近系时期沾化凹陷断裂系统发育较东营凹陷弱,成藏圈闭相对较少,大部分的油气通过砂体、不整合面、断层以网毯的方式运聚到馆陶组地层中,从而形成了凹陷内馆陶组大型油气藏。最后预测了东营凹陷馆陶组有利勘探区带。

Condition Potential analysis of hydrocarbon accumulation of Neogene Guantao formation in Dongying depression

Fluvial facies is widespread in Shengli oildom in Neogene,which has preserved rich oil & gas resources.Through comparison and analysis of sedimentary strata,tectonic setting,oil and gas generation and migration and accumulation conditions of Dongying and Zhanhua depression,hydrocarbon accumulation potential difference of Guantao formation has been studied.It is considered that,accommodation space changes of Zhanhua depression is larger than Dongying depression,which is caused by tectonic subsidence.As a result,Guantao formation of Zhanhua is thicker,with deeper water and strong heterogeneity sandbody.Because of the weaker fault system at Paleogene in Zhanhua,traps with reservoirs are less,most of the oil and gas migrated through sandbody,unconformity and faults to Guantao formation,which is like a blanket.In the end,favorable exploration target of Dongying depression is forecasted.