伏龙泉断陷白垩系油气成藏规律及优势储层特征

伏龙泉断陷是松辽盆地东南隆起区的次级构造单元,处在反转构造较为强烈的背斜带上。在研究区基本成藏条件研究的基础上,总结了伏龙泉断陷油气成藏规律及优势储层特征。伏龙泉断陷油气主要来自沙河子组和营城组的烃源岩;成藏期分为三期:泉头组—嫩江组沉积时期、嫩江组沉积末期构造运动时期、嫩江组沉积末期构造运动之后至现今。构造是控制伏龙泉断陷成藏的重要因素,断陷深部油气藏具有先成藏后致密、近源早成藏的特征,早期成藏的储层具有好的物性条件;浅部油气藏均为次生油气藏,成藏受嫩江组末期构造运动控制。

Cretaceous hydrocarbon accumulation and favorable reservoir characteristics in Fulongquan sag

Fulongquan sag is a second-order structural unit of the southeast uplift in Songliao Basin, and lies in an anticline belt with strong inversion structure. Based on the study of basic conditions of hydrocarbon accumulation in the study area, the authors summarize the hydrocarbon accumulation and favorable reservoir characteristics of Fulongquan sag. The oil and gas in Fulongquan sag mainly come from the source rocks of Shahezi Formation and Yingcheng Formation. The accumulation occurred in three periods:deposition period of Quantou-and Nenjiang formations, end-Nenjiang Formation structural period, and post-Nenjiang Formation period. Structure is the most important factor to control the hydrocarbon accumulation in Fulongquan sag, deep oil-gas reservoirs possess the characteristics of accumulation prior to the compaction and source-proximal early accumulation. The reservoir of early accumulation has better physical properties. Shallow reservoirs are all secondary accumulations, which are controlled by the tectonic movement at the end of Nenjiang Formation.