摘要
渤海新生代构造格局主要受郯庐断裂系和塘沽-蓬莱断裂系控制;渤鲁帚状构造系和黄骅-东濮隐伏断裂系分别对渤海南部和西部构造影响较大.渤海新生代构造演化史与渤海湾盆地陆区类似,但主要断裂活动期和沉降期比陆区晚,导致渤海含油气系统特征有如下特殊性:①发育沙三段和渐新统两套成熟烃源岩,比陆区多发育一套渐新统沙一段-东下段成熟烃源岩;②湖盆萎缩较晚,东营组和上第三系的砂体类型和储盖配置优于陆区;③后期构造活动强烈,有利于形成浅层油气聚集;④下第三系普遍存在地层超压现象,对油气成藏作用有重要影响;⑤多期成藏和主要油气藏形成较晚.渤海油气分布的三大特点是:①以上部成油组合为主力,中部组合也有较大潜力;②油气富集带以凹陷之间的基岩凸起带为主,其次是凹陷内部的Y字型断裂背斜带;③大油田主要分布于资源量超过5亿t的富含油气系统中.渤海勘探程度较低,应用复式油气聚集带和含油气系统理论,围绕基岩凸起和Y字型断裂背斜带还可发现可观的油气储量.
The Cenozoic tectonic framework in Bobal Sea is controlled mainly by Tanlu and Tanggu-Penglai Fault Systems,while Bozhong-Shandong brush structure system and Huanghua-Dongpu buried fault system have a major effect on the southern and western Bohai Sea. Its Cenozoic tectonic evolution history is similar to that of onshore Bohai Sea Basin,but its major episodes of rifting and subsidence are later, resulting in petroleum system peculiarities: (a)There are two sets of mature source rock, that is, Member 3 of Shahejie Formation and Member 1 of Shahejie Formation to Lower Dongying Formation,with the latter not to thermal maturity onshore; (b)The lacustrine basin lasted longer,so sand-body type and reservoir-sealing combination in Dongying Formation and Neogene are better than those onshore; (c ) The later tectonic movements are strong and favorable to shallow hydrocarbon accumulations; (d)Over-pressured zones are widely developed in Paleogene,making a great effect on formation of plays; (e)Oil and gas accumulated in multiple stages,with the principal stage relatively later. For the distribution of oil and gas in Bohai Sea,the following points can be concluded: (a )The upper source-reservoir combination occupies first place in hydrocarbon potential,and the middle one comes second; (b)The uplift zones between sags are most important in hydrocarbon accumulation,and the Y-type faulted anticlines within sags are also of great significance; (c) Giant oil fields would only be found in rich petroleum systems with resource potential more than 5 × 108t.The exploration is still not mature in Bohai Sea,and substantial new reserves may be found around the uplift zones and the Y-type faulted anticlines by using composite hydrocarbon accumulation and petroleum system.
出处
《中国海上油气（地质）》
2001年第1期3-10,共8页
China Offshore Oil and Gas(Geology)
关键词
渤海
新生代
含油气系统
特征
油气分布规律
Bohai Sea
petroleum system
oil and gas distribution
tectonic evolution history
potential exploration target
