摘要
石港断层位于金湖凹陷中部,是凹陷内的主要断裂带,具有复杂的结构及演化过程。通过三维地震资料解释及断层的定量解析,分析了石港断层带在晚白垩世—新生代时期的几何学及运动学特征,并讨论了断层伸展与走滑性质的转变及其分段特征。研究表明:自晚白垩世—新生代石港断层经历了凹陷内次级正断层、控制次凹的边界正断层到右旋走滑正断层的演化过程;平面上石港断层具有明显的分段特征,由北向南断层性质发生走滑—扭张—张扭—正断层的转变;断层的分段特征受基底先存断层的影响,断层性质的转化则反映了区域应力场方向的改变。在伸展与走滑作用的共同影响下,石港断裂带内聚集了丰富的油气。
Shigang Fault is located within the centre of Jinhu Sag,which is the major fault zone of this sag with complex structure and evolution process.Based on the 3D seismic data and quantitative analysis,the characteristics of geometry and kinematics of Shigang Fault was analyzed during the late Cretaceous-Cenozoic period,meanwhile the property transferred from extension to strike-slip of the fault and its segmentation character were also discussed.In the late Cretaceous-Cenozoic,Shigang Fault has experienced three processes,including the secondary normal fault stage, boundary normal fault stage and right-lateral strike-slip normal fault stage. On the plane, Shigang Fault has obvious segmentation character, from north to south, the fault property varieties from strike-slip feature to shear-tensional feature, from tensional-shear feature to normal fault feature. It shows a strike-slip component in the northern part, normal fault in the southern part. The differential deformation is controlled by the pre existing fault in basement, which reveals the change of the extension direction. The extension and strike-slip resulted in the abundant hydrocarbon accumulation in Shigang Fault Zone.
出处
《石油学报》
EI
CAS
CSCD
北大核心
2009年第5期667-671,677,共6页
Acta Petrolei Sinica
基金
国家重点基础研究发展规划(973)项目(2006CB202301)
国家自然科学基金项目(No.40772085)联合资助
关键词
金湖凹陷
石港断层
晚白垩世—新生代
构造演化
伸展与走滑作用
Jinghu Sag
Shigang Fault
late Cretaceous-Cenozoic period
structural evolution
extension and strike-slip action
