辽河东部凹陷潜山油气藏特征及油气分布规律

Pool features and hydrocarbon distribution of the buried hills in the eastern sag of Liaohe depression,China

辽河坳陷东部凹陷发育茨榆坨、三界泡及油燕沟三个潜山带,在平面上沿NE向呈条带分布,均为平行型背向传递带。潜山油气藏的主要油源为新生界沙河街组第一段、第三段和中生界侏罗系的烃源岩;储集层由太古界变质岩、下古生界碳酸盐岩和中生界砂岩、火山岩组成,储集空间主要为构造裂缝及溶蚀孔隙;沙河街组、中生界、下古生界泥岩和房身泡组火山岩构成潜山油气藏良好的盖层。根据潜山构造特征、成藏条件及圈闭类型的差异,将潜山油气藏分为潜山顶部及内幕两种类型。潜山油气多分布于近源的断裂带附近,盖层是油气富集和保存的重要条件,潜山带构成了复式油气聚集带。

The Ciyutuo, Sanjiepao and Youyangou buried hills are collateral transfer zones and are distributed along NE direction structural belts in the eastern sag theLiaohe depression. The first and third members of Cenozoic Shahejie Formation and the Jurassic are the main source rocks of the buried hill pools. The reservoir rocks are Archaean granite, Lower Paleozoic carbonate rocks, Mesozoic sand rock and volcanic rock and fracture, solution cavities and pores are the major preserving spaces. The cap rocks are the Shahejie Formation, Mesozoic and Lower Paleozoic mudstone and the Fangshenpao Formation volcanic rock. The buried hill pools can be divided into hill-top type and inside-hill type. The hydrocarbon pools are basically distributed close to the fractural belts near source rocks. The cap rocks are the important condition of the oil and gas pools. The buried hills make the complex oil-gas accumulation belts.