Paleogene Structure-Stratigraphic Framework and Multiple Episode Evolution in Kongnan Area, Huanghua Depression
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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.Abstract: 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(Ek1Ⅲ) 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 Ek1Ⅲ 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 effect. 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.
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图 1 黄骅坳陷孔南地区构造位置及构造单元分布
①孔店潜山构造带；②乌马营-灯明寺断裂构造带；③小集-段六拨断裂构造带；④沧市裙边鼻状构带；⑤沧东凹陷；⑥南皮凹陷；⑦常庄凹陷
Fig. 1. Tectonic location and subdivisions of the Kongnan area of Huanghua depression distribution
图 2 黄骅坳陷孔南地区新生代充填序列、沉降历史及演化特征
Fig. 2. Cenozoic filling sequence, subsidence history and structure evolution characters of the Kongnan area of Huanghua depression
图 3 黄骅拗陷孔南地区构造-地层格架及主要界面反射特征(位置见图 1)
Fig. 3. Structure-stratigraphic framework and reflection characteristics of the sequence boundary in the Kongnan area of Huanghua depression
图 4 黄骅坳陷孔南地区古近纪构造演化各幕地层残余厚度，构造格架及应力分析
Fig. 4. Residual thickness, tectonic framework and stress analysis in different evolution stages during Paleogene in the Kongnan area of Huanghua depression
图 5 黄骅坳陷孔南地区新生代主要断裂活动性
Fig. 5. Activity of main faults during Cenozoic in the Kongnan area of Huanghua depression
图 6 黄骅坳陷孔南地区新生代幕式构造沉降特征
Fig. 6. Cenozoic tectonic episodes characters in Kongnan area of Huanghua depression
图 7 渤海湾盆地新生代构造演化动力学背景(据祁鹏等, 2010修编)
a.渤海湾盆地孔店组地层残余厚度图及太平洋板块俯冲方向(Northrup et al., 1995; Allen et al., 1997, 1998)；b.渤海湾沙河街组三段地层残余厚度图及太平洋板块俯冲方向；c.中国东部新生代伸展盆地的形成机制(Watson et al., 1987; 任建业和李思田, 2000)
Fig. 7. Dynamic setting maps of Cenozoic tectonic in the Bohai Bay basin
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