辽东地区构造演化及其对构造样式的影响

Structural evolution and its influence on structural styles of Liaodong area

基于三维地震数据、岩心和测井数据,将辽东地区新生界自下而上划分为孔店组-沙河街组、东营组和馆陶组、新近系-第四系三套构造层。构造层的发育分别对应于盆地演化的强烈伸展断陷期、强走滑断坳转换期和热沉降坳陷期三个阶段。对应于各阶段构造的差异活动,各构造层断裂的发育特征存在差异。下部构造层以发育NNE向正断层为主,断裂组合以伸展构造样式为主;中部构造层以NNE向走滑断裂为主,断裂组合以走滑构造样式为主;上部构造层多为NE向次级断裂,断裂发育组合以弱走滑构造样式为主。

Based on detailed analysis of 3D seismic data, drilling and well logging data, the Cenozoic formation of Liaodong bay depression can be divided into three tectonic layers from the bottom to up: Kongdian-Shahejie formation, Dongying and Guantao formations, and Neogene-Quaternary tectonic layer. They correspond to three structural evolution stages as continental rift stage, rift-depression transition stage and thermal subsidence depression stage. The transition changes of the three evolution stages result in the different structural styles developed in different structural zones: the lower tectonic layers developed NE trending normal faults which controlled the sedimentation and basin basement structure formation, mainly developing stretch structural structure; the central tectonic layers developed NNE strike slip fault, mainly developing stretch and strike-slip structure; the upper tectonic layers developed NE secondary fault, mainly developing weak strike-slip structure.