渤海始新统沙四段层序地层特征及与周边油区的对比THE CHARACTERISTICS OF THE MEMEBER 4 OF SHAHEJIE FORMATION IN BOHAI BASIN AND ITS CORRELATION WITH NEIGHBOURING OILFIELDS
朱文森,刘士磊,王立红,张若祥,薛金宝
摘要(Abstract)：
渤海湾盆地始新统沙四段(沙河街组四段)形成时的构造背景特点决定了它的复杂性、多变性和多样性。沙四段在其建组剖面分为沙四上、中和下三个亚段。随着新钻井的增多和研究的不断深入,渤海沙四段层序地层的认识也在不断加深。渤海以前的沙四段基本没有分出亚段,只是分出了南北两种类型。现在认为渤海发育完整的沙四段,分为上下两个亚段,下部为蒸发盐湖相沉积,上部为正常的砂泥岩沉积。南部发育完整的沙四段,北部只钻遇了沙四上亚段,可能缺失沙四下亚段;上下亚段以假整合接触,南北地层是统一的,而不是两种类型。沙四下亚段相当于济阳坳陷典型沙四段中、下两个亚段。沙四段分为继承和残留两种类型,二者有很大的差别。沙四段下亚段不具备生油能力,上亚段发育完整的生储盖组合,可以形成自生自储的油气田,是深层勘探的重要方向之一。
关键词(KeyWords)： 地层层序;标志层;勘探潜力;沙河街组;始新统;渤海湾
基金项目(Foundation): 科技部科技基础工作专项(2006FY120300-4)资助
作者(Author): 朱文森,刘士磊,王立红,张若祥,薛金宝
DOI: 10.19839/j.cnki.dcxzz.2010.02.006
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