辽河断陷连续型油气聚集特征及聚集模式研究

Continuous Hydrocarbon Accumulation Properties and Patterns in Liaohe Fault-Depression

为落实辽河断陷连续型油气的分布特点,运用层序地层学的研究方法,厘定了辽河断陷构造沉积演化的旋回期次以及在其控制下的生、储、盖组合特征,分析总结断陷盆地连续型油气聚集的规律:①三级层序下的低位、水进、高位体系域的优质烃源岩为连续型油气聚集提供油气供给条件;②主成盆期发育的连续型储层成为连续型油气聚集的载体;③每个三级层序中的高位体系域泥岩为区域性盖层,为常规油气、非常规油气的形成提供良好的盖层。基于上述认识,构建了连续型油气聚集模式,并在雷家以及大民屯凹陷开展常规油气-致密油气-页岩油气的勘探部署,获得规模储量。连续型油气聚集模式研究可为同类型断陷的油气勘探提供借鉴。

In order to gain the distribution of continuous hydrocarbon in Liaohe Fault-depression,sequence stratigraphy was used to determine the tectonic sedimentary evolution cycles and the properties of source-rock,reservoir and cap-rock under its control and further analyze the continuous hydrocarbon accumulation patterns in this fault-depression.①The high-quality source-rocks in the low-stand,transgressive and high-stand system tracts of third-order sequence provide hydrocarbon supply conditions for the continuous hydrocarbon accumulation.②The continuous reservoir in the major stage of basin development served as the carrier of continuous hydrocarbon accumulation.③The mudstones in the high-stand system tract of each third-order sequence served as the regional car-rocks,providing favorable cap-rocks for the conventional and unconventional hydrocarbon accumulations.A continuous hydrocarbon accumulation pattern was established based on these understandings.Convectional,tight and shale hydrocarbon explorations were deployed in Leijia and Damintun,which had gained large-scale reserves.This research on continuous hydrocarbon accumulation could provide certain reference for the hydrocarbon exploration of similar fault-depressions.