莱州湾凹陷南部缓坡带垦利16-A构造特征及其控藏作用

垦利16-A构造位于莱州湾凹陷南部缓坡带，油气成藏特征复杂。为了解决该区油气成藏差异性和复杂性，首先系统分析断裂体系和圈闭特征，在此基础上，综合研究其构造演化特征，分析其对油气成藏的控制作用。研究认为，垦利16-A构造经历孔店组—沙四段沉积期的早期断陷、沙三段沉积期的强烈断陷、沙一二段—东营组沉积期的断—坳转换及新近纪—第四纪坳陷、新构造运动四个构造演化阶段，不同时期不均衡沉降导致东、中、西三块差异演化，发育走滑、伸展两类断裂体系，古近系分布及残留厚度差异明显。构造差异演化控制油气藏的形成与特征，主要表现在生烃中心发育与迁移、构造圈闭形成与类型、沉积类型与储层展布、油气成藏模式等方面。

Structure characteristics and its control to reservoir in the southern slope of Laizhouwan Sag

Laizhouwan Sag,a Cenozoic marginal sag located in the southeast of Bohai Sea,is characterized by complex hydrocarbon accumulation.In order to solve the diversity and complexity of hydrocarbon accumulation,tectonic evolution characteristics are studied based on the analysis of fault system and trap characteristics,and reservoir control effects are defined.Based on our research,KL16-A structure went through four evolutionary stages:early faulted stage of E_1-2k~E₂s₄,strong faulted stage of E₂s₃,fault-depression stage of E₃s_1-2~E₃d,and depression and Neotectonics stage of N~Q.The imbalance subsidence in periods led to the different evolution of the eastern,central and western blocks,the development of strike-slip and extensional fault systems,and the obvious different resi-dual thickness of Paleogene.The different tectonic evolution controlled reservoir characteristics including the development and migration of hydrocarbon generating center,trap formation and type,sedimentary type and reservoir distribution,and hydrocarbon accumulation model.