东营凹陷沙三-东营期断裂活动特征

断裂是控制东营凹陷构造演化的主要因素。应用断层落差法对东营凹陷沙河街-东营期的断裂活动特征进行了研究。结果表明，东营凹陷古近纪在近南北向的伸展方向上，断裂活动强弱交替，在沙三-沙二早期断层活动强烈，沙二晚期-东营期断层活动明显减弱。东营凹陷的断层在平面和剖面上有多种不同的几何形态，组成了半地堑、半地垒和地堑-地垒多种形式的断块体，其组合分布使整个凹陷具有南北分区块断的构造特征。断裂活动时空分布具有不均一性，在北西-南东向和南北向的双向伸展作用下，东营凹陷的断裂活动在空间上具有分段性特征。

Characteristics of fault activities of Sha-3 member and Dongying periods in Dongying depression

Fault is the main factor controlling the tectonic evolution in Dongying depression. The characteristics of the fault activities of Shahejie- Dongying periods were researched by the fault throw method in Dongying depression. The results show that the fault activity appears strong and weak alternately in the extension direction of N - S during the Paleogene in Dongying depression. The fault activities were intense in Es3 and the lower part of Es2 periods, and obviously weaken in the later of Es2 to Ed periods. The faults have manifold different geometrical shapes in the plane and the section in Dongying depression, which make up manifold faulted blocks being half graben, half horst and graben-horst, and the distribution makes the Dongying depression be segmented from north to south. The space-time distributon of fault activities takes on inhomogeneity, and the inner faults of Dongying depression are characterized by subsection in space under the extension with two-direction taking in NW - SE and N S.