黄骅坳陷孔南地区古近纪构造—地层格架和幕式演化过程  

Paleogene Structure-Stratigraphic Framework and Multiple Episode Evolution in Kongnan Area, Huanghua Depression

作　　者：叶琳[1,2] 张俊霞[3] 卢刚臣 张振宇[1] 

机构地区：[1]中国地质大学资源学院,湖北武汉430074 [2]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [3]中国地质大学经济管理学院,湖北武汉430074 [4]东方地球物理公司研究院大港分院,天津300280

出　　处：《地球科学（中国地质大学学报）》2013年第2期379-389,共11页Earth Science-Journal of China University of Geosciences

基　　金：国家科技重大专项(No.2008ZX05023-001);中国地质大学构造与油气资源教育部重点实验室开放课题基金(No.TPR-2011-02)

摘　　要：以黄骅坳陷孔南地区新采集的三维地震资料和钻井资料为基础,追踪闭合了盆地内重要的层序地层界面,精细解释了盆地内部的主要构造和地震反射结构特征,新识别出一条重要的构造不整合界面——枣Ⅲ(Ek1Ⅲ)界面,建立了盆地同裂陷阶段的构造-地层格架,划分了盆地新生代幕式构造演化阶段;在此基础上,通过断层地质属性及其组合样式分析、并运用回剥技术和断层活动性定量计算,深入分析了盆地同裂陷阶段不同构造幕的构造演化过程,提出Ek1Ⅲ界面为孔南地区新生代裂陷作用的起始界面,代表了古近纪初期Ek3-Ek1下亚段时期拗陷作用向Ek1上-Ed时期的裂陷作用转变的构造变革界面.之后从Ek1上亚段至Ed沉积时期盆地的裂陷沉降又经历了由正向伸展断陷向右旋走滑伸展断陷两幕不同构造变形方式的演化阶段.在上述构造演化过程中,盆地的断裂系统及其所控制的沉降中心发生规律性迁移,进而制约了盆地沉积体系配置.Based on the newly released 3D seismic and drilling data in the Kongnan Area, Huanghua Depression, we tracked several sequence boundaries on the seismic profiles and interpreted structure styles and seismic reflection characteristics, which will help us identify an important tectonic unconformity boundary（Ek1 III ） and further classify the episodic stages of tectonic evolution in Paleogene and build up structure-stratigraphic framework in rifting stages of the basin. Furthermore, we analyzed the detailed tectonic evolution processes of the basin with different tectonic episodes of rifting stages by means of backstripping and fault properties, combination types, activity analysis, that confirm that Ek1 III boundary represents the tectonic revolutionary boundary which imply a rifting initiation from upper First member of Kongdian Formation to Dongying Formation in Kongnan Area. From Third member of Kongdian Formation to lower First member of Kongdian Formation evolution of the basin was controlled by sag effeet. At rifing stage, the basin underwent processes from extensional episode to dextral strike-slip and extensional episode. Both of the fault systems and subsidence center have migrated regularly and restricted the distribution of the basin depositional system.

关 键 词：黄骅坳陷 孔南地区 构造变革 构造-地层格架 

分 类 号：P542[天文地球—构造地质学]