胶莱盆地莱阳凹陷构造特征及演化

莱阳凹陷是白垩纪残留盆地的一个次级构造单元,在地震剖面解释和地面地质资料分析的基础上,将该凹陷的基本构造特征总结为:白垩系各群组充填差异明显,上下白垩纪之间存在明显的角度不整合,褶皱断裂构造发育。通过计算剥蚀量、编制构造演化剖面和综合地质分析,将莱阳凹陷的构造演化历史划分为莱阳期拉分断陷、青山期扩展断陷、青山期末挤压褶皱、王氏期再次拉分断陷和新生代抬升剥蚀5个阶段。早白垩世的构造演化提供了油气的形成条件,晚白垩世和新生代的构造活动则对油气藏进行了改造。

STRUCTURAL CHARACTERISTICS AND EVOLUTION IN THE LAIYANG DEPRESSION OF THE JIAOLAI BASIN

The Laiyang Depression is a secondary structural unit of the residual basin developed in the Cretaceous period.There are obvious differences in terms of different periods of the Cretaceous deposition,an angled unconformity surface existing between the Upper and the Lower Cretaceous,and well developed folds and faults in the depression.The structural evolution history may be divided into five stages including pull apart faulted depression during the Laiyang period,the extensional faulted depression during the Qingshan period,compressed folding at the end of the Qingshan period,re pull apart faulted depression during the Wangshi period and uplifted erosion during the Cenozoic.The tectonic activity during the Early Cretaceous provided conditions of deposition of hydrocarbon source rocks,and tectonic movement occurred in the Late Cretaceous and the Cenozoic resulted in formation and adjustment of oil and gas pools.