【摘要】 琼东南盆地主要经历了古近纪裂陷和新近纪拗陷2个构造演化阶段,古近纪裂陷阶段的充填演化史可划分为始新统陆相湖盆充填阶段、崖城组海陆交互环境充填阶段和陵水组分割浅海环境充填阶段;与此对应,古近系可划分为S80-100、S70-80、S60-70等3个二级层序。根据凹陷的几何结构形态与层序界面、充填样式的关系,可将琼东南盆地裂陷期层序结构划分为地堑构造平行-似平行层序结构、半地堑构造发散-似发散层序结构和断陷过渡带似平行层序结构等3种类型。琼东南盆地裂陷期主要发育浅水型和深水型2种类型烃源岩,不同层序结构的凹陷具有不同的烃源岩类型和生烃潜力。更多还原

【Abstract】 Qiongdongnan basin has experienced two tectonic evolution stages,i.e.Paleogene rifting and Neogene sagging.For the depositional filling history during Paleogene rifting,there are three phases in the basin,i.e.Eocene lacustrine filling,Yacheng Formation paralic filling and Lingshui Formation limited shallow sea filling.Correspondingly,the Paleogene sediments can be divided into three second-order sequences,including S80-100,S70-80,S60-70.According to relationships among depression geometry,sequence boundary and filling pattern,three types of sequence configuration can be identified,i.e. parallel-approximately parallel sequences in graben structures,divergent-approximately divergent sequences in half-graben structures and approximately parallel sequences in intermediate zones of rifting.Two types of major source rocks,i.e.deep-water and shallow-water types,have developed during rifting in the basin,and there are different source rock types and hydrocarbon-generation potential for the depressions with different sequence configuration.更多还原