霸县凹陷构造特征及新生代构造演化  

Structural characteristic and Cenozoic tectonic evolution in Baxian sag

作　　者：马兵山 漆家福[1,2] 高强[1] 王利爽[1] 杨克基[1] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《地质科学》2017年第2期343-358,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金面上项目（编号：40372072,41572202）资助.

摘　　要：霸县凹陷是由牛东断层控制的西断东超的新生代箕状凹陷。本文以连片三维地震资料为基础，采用断层落差法和平衡剖面技术研究了凹陷的构造特征与构造演化特征。结果表明：牛东断层可以分为3段，北段为一系列NE—NNE向东倾断阶带，中段为铲式-略微坡坪式断裂带，南段为帚状断裂带。霸县凹陷相应划分出北部、中部、南部3个构造单元。牛东断层具有分段活动的特点，具体表现为：早期（Ek-Es4）中北段活动强烈、中期（Es3-Es2）中南-中北段活动强烈、晚期（Es1-Ed）整体强烈活动、北段剧烈活动，活动强度具有自南向北迁移的规律，其活动性差异控制了变换带的形成和凹陷的构造格局。霸县凹陷新生代构造演化可以分为古近纪的裂陷阶段和新近纪以来的拗陷阶段，其中古近纪分为Ek-Es4较强裂陷期、Es3-Es2弱裂陷期和Es1-Ed强裂陷期，由此控制烃源岩、储层的形成、油气的运聚和分布。Baxian sag, controlled by the Niudong fault, is a Cenozoic half-graben with faulting in west and overlap in east. Based on continuous 3D seismic data, various methods including fault throw method, balanced cross-section technique are adopted in this paper to analyze the structural characteristics and Cenozoic evolutionary process. The results show that Niudong fault can be divided into three sections： In north, it shows a series of NE-NNE fault terrace zone dipping east; in central, it presents as listric fault; in south, it is characterized as brush structure. Baxian sag is divided into three sections accordingly. Niudong fault shows a sectional activity in Paleogene, and activity strength migrates from south to north with time. There are mainly three periods： In Ek-Es4 period, north-central segment present a stronger activity; in EsL Es2 period, south-central and north-central segments became stronger; in Es1-Ed period, the whole fault has strong activity while the north has stronger activity. Baxian sag underwent rifting stage in Paleogene and depression stage in N-Q. And the rifting stage is subdivided into three sub-rift screens： Ek-Es4 period, Es3-Es2 period and Es1-Ed period. The evolution characteristics of Baxian sag had an appreciable effect on development and distribution of source rocks, reservoirs, traps.

关 键 词：霸县凹陷 牛东断层 新生代 构造特征 构造演化 

分 类 号：P542[天文地球—构造地质学]