埕北低凸起油气聚集特征

Oil gas accumulation characteristics of Chengbei lower arch

埕北低凸起地史上经历了印支、燕山、喜山三次大的构造运动,构造部位不同,其潜山残存地层和上覆下第三系地层变化都较大。根据圈闭成因和形态将油气藏分为①披覆背斜油气藏、②滚动背斜油气藏、③断层油气藏、④潜山油气藏、⑤岩性油气藏、⑥岩性-构造油气藏、⑦地层超覆油气藏七种类型。不同层位不同构造部位的油气来源不同,不同烃源岩区油气运移通道也不一样,低凸超可分为南部及埕北大断层下降盘、北部斜坡、东部埕北30潜山三个油气聚集区。通过分析,指出埕北30潜山西边沟谷东营组下部应是今后勘探的重要目标。

On Chengbei lower arch geological histroy,it underwent three large tectonic movements:Indosinicles,Yanshan and Himalayan movements.It′s buried hill residual formation and uplayer Paleogene formation varied with different tectonic positions.According to the trap genesis and morphology,the oil gas reservoir is divided into ①drape anticline,②rollover anticline,③fault,④buried hill,⑤lithology,⑥lithology-tectonic,⑦formation overlap.Sources of gas and oil are different with different zone and different tectonic position.Oil gas movement pathes are also different with different hydrocarbon source rocks.Lower arch can be divided into three oil gas accumulation areas:South and Chengbei large fault downthrow block,North Slop and East Chengbei 30 buried hill.The author pointed out by analysis that lower part of Dongyin Group in west channel of Chengbei 30 buried hill should be the important objective in future exploration.