歧口凹陷形成控制因素与演化特征

结合前人认识．依照最新黄骅坳陷歧口凹陷5280km2超大地震数据体、岩心、测井、录井资料等研究结果得出：歧口凹陷新生代盆地结构发育受褶皱、逆冲构造、右旋伸展走滑运动、沿岸走滑断裂带和火山岩等控制，总体由断陷转盆地转为坳陷盆地，断、坳期各发育2幕构造运动，期间存在3个显著不整合界面，界面上下地层沉积特征明显不同；其陆上沉降史与海域沉降史发育存在很大的差别，陆上近南北向结构变现为典型北断南超多米诺式半地堑结构，海域地区则表现为大型复式地堑，海域地区比陆上地区沉积速度更快。

Formation controlling factors and evolution characteristics of Qikou Sag

Combined with the knowledge from predecessors and based on the latest research results of 5,280 km2 super large 3D seismic： data volume, core and well logging data from Qikou Sag in Huanghua Depression, it is considered that the structure development of Cenozoic basin in Qikou Sag is controlled by folding, thrust structure, dextral strike slip fault movement, coastal strike slip fauh zone and volcanic rock. The depression appruximately transforms from fault basin to depression basin and there are two times of tectonic movements in fauh basin and depression basin, in which there are three uneonfnrmity interfaces. The sedimentary characteristics are obvious different at the up and down unconformity. There are obvious different from terrestrial subsidence to thalassie subsidence. The nearly north and south terrestrial subsidence formation is north-wreckage and south-onlap domino half-graben formation. Thalassie subsidence is large compound graben and the thalassie subsidence is faster than lhat of terrestrial subsidence.