珠江口盆地惠州凹陷SQ2～SQ4岩性油气藏成藏分析

Analysis of Lithologic Hydrocarbon Reservoir Accumulation of Sequence 2～4 in Huizhou Depression of Pearl-river Mouth Basin

从目前惠州凹陷岩性油气藏勘探结果来看,岩性油气藏大多分布在SQ2-SQ4等3个层序中,分析总结这3个层序中的典型岩性油气藏形成的控制因素,油气运移通道等,建立该地区的岩性油气藏成藏模式,指导惠州凹陷岩性油气藏勘探。惠州凹陷的烃源岩主要有文昌组和恩平组烃源岩,其中文昌组烃源岩对岩性油气藏成藏贡献较大;岩性砂体的发育受到沉积坡折和沉积相带的共同控制,储层物性较好;油气可以沿着断层和砂体运移到有利圈闭中成藏。

Seeing from the exploration results of lithologic reservoirs in Huizhou Depression,the most of lithologic reservoirs were distributed in SQ2~SQ4.The control factors on the reservoir accumulation and pathway of oil and gas migration were analyzed,the lithologic reservoir accumulation patterns were established.There exist 2 sets of lithologic reservoirs in Huizhou Depression,such as Wenchang Formation and Enping Formation,of which Wenchang Formation has the highest distribution to the reservoir accumulation;the lithologic sand development is controlled by both of sedimentary slope-break and sedimentary facies belt and reservoir physical property is good,oil and gas can be migrated into the beneficial traps along the fault and sand-bodies.