渤海湾盆地黄骅坳陷新生代结构特征及构造动力学模式

为了揭示黄骅坳陷新生代构造动力学机制, 本文运用油区构造解析理论, 对黄骅坳陷新生代盆地结构特征做了综合分析。结果表明黄骅坳陷的古近系可视为发育在沧东断层上盘的地堑—地垒构造系统。不同区段的盆地结构特征有显著的差异, 南区总体表现为两个地堑式断陷, 断陷结构与基底断裂产状的变化有关; 中区南部表现为由3条SE向倾斜的正断层控制的半地堑系, 向北变为地堑断陷结构; 北区盆地结构主要受NE向和NW向断层控制, 表现为半地堑或地堑断陷结构。在黄骅坳陷新生代盆地结构特征分析的基础上, 进一步讨论盆地结构演化过程和动力机制之间的关系, 提出了黄骅坳陷新生代构造动力学模式。

Cenozoic Structure Features of Huanghua Depression and Its Structure Dynamics Model

In order to reveal Cenozoic structure dynamics mechanism of Huanghua Depression, the authors made a comprehensive analysis of Cenozoic basin structure features of Huanghua Depression using the theory of Oilfield Structural Analysis. The result shows that the whole Paleogene strata of the Huanghua Depression can be regarded as a graben-horst structure system in the upper wall of Cangdong fault. The basin structure features are obviously different in different segments. The southern area consists of two graben fault-depressions whose structures are related to the attitudes of fundamental faults, the southern part of the middle area assumes a half graben system controlled by three SE-dipping normal faults, and the northern part of the middle area converts into a graben fault-depression. The structure of the northern area is mainly controlled by NE- and NW-trending faults and as-sumes a half graben or a graben fault-depression. Based on an analysis of structure features in Cenozoic basin of Huanghua Depression, this paper further discusses the relationship between the evolutionary process of basin structure and dynamics mechanism, and puts forward a Cenozoic structure dynamics model for Huanghua Depres-sion.