渤海海域郯庐断裂带对油气成藏的控制作用

在渤海海域,靠近郯庐断裂带的渤南和辽东湾探区的油气较富集,而远离郯庐断裂带的渤西探区油气相对较贫,油气藏主要围绕郯庐断裂带分布,这些都说明了郯庐断裂带附近具有很大的油气勘探潜力.平衡剖面分析表明,郯庐断裂带在渤海海域主要表现为古近纪伸展、新近纪走滑的构造特征,古近纪伸展活动控制了生烃凹陷的形成,并促进烃源岩的快速演化;新近纪的强烈走滑作用形成了大量的构造圈闭,并促进了油气的运移及晚期成藏.渤海海域的油气资源勘探前景乐观,只是现今的探明程度较低.

Control of the Tan-Lu fault zone on hydrocarbon accumulation in the Bohai Sea waters

In the Bohai Sea waters,near the Tan-Lu fault zone,the Bonan and Liaodong Bay exploration areas have great potential for hydrocarbons.While apart from the Tan-Lu fault zone,the Boxi exploration area has less oil and gas.In addition,the existing discoveries are all distributed surrounding the Tan-Lu fault zone.From the above-mentioned facts,we can conclude that,near the Tan-Lu fault zone,there is a great potential for hydrocarbon exploration.Balanced-cross sections show that the Tan-Lu fault zone of the Bohai Sea area shows tectonic features of extension in the Paleogene and strike-slip in the Neogene.The Paleogene extensional activities controlled the development of hydrocarbon kitchens and promoted the fast maturation of source rocks.Later,the Neo-gene strike-slip activities shaped many structural traps and helped the hydrocarbon migration and late accumulation.The Bohai Sea waters show great potential for hydrocarbon exploration,while to date,only a small amount of the total resources have been proved.