摘要
在对二、三维地震资料系统解释的基础上,通过不同区域断层分布特征和演化及盆地结构的差异性分析,将琼东南盆地北部坳陷带划分为两个断裂系统(东部断裂系统和西部断裂系统)及8个子系统,并阐述分析了各子断裂系统的断层分布特征和规律。再利用平衡剖面技术,研究分析了琼东南盆地断裂系统的演化阶段和断层的活动期次,确定"长期活动型"、"早衰型"、"中期活动型"(分"中期活动Ⅰ型"和"中期活动Ⅱ型")、"晚成型"等4个系列的断层占主导地位。分析确定琼东南盆地复杂的断裂系统是在先存构造条件下,两期不同方向伸展变形叠加而成,其中南北向伸展的递进变形起主导作用;不同区域先存构造分布和活动的差异是造成琼东南盆地断裂系统复杂性的根本原因。
On the basis of systematic structural interpretation of the 2D and 3D seismic data and analysis of the fault distribution and evolution, and basin structure in different regions, the Northern Depression Zone of the Qiongdongnan Basin is divided into two fault systems （Eastern and Western fault systems） and eight sub-fault systems. The characteristics and patterns of fault distribution in each sub-fault system are described in this paper. The evolution stages of the fault systems and their activation phases were also analyzed with balanced section technology. Four dominant evolution patterns of the faults, including“long-term activity type”,“premature type”,“mid-term activity type”（further subdivided into“mid-term activity type Ⅰ”and“mid-term activity type Ⅱ”）, and“late activity type”, were recognized. We concluded that the complicated fault systems in the Qiongdongnan Basin were formed by the superposition of two phases of extension with different extension direction, while the NS direction extension played a primary role. The difference of pre-existing weakness distribution and activation in different regions is primary cause for the complexity of the fault systems in the Qiongdongnan Basin.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2015年第5期795-807,共13页
Geotectonica et Metallogenia
基金
国家油气重大专项(2011ZX5023-004-012和2011zx05006-006-02-01)
国家自然科学基金(41272160和40772086)联合资助
关键词
琼东南盆地
断裂系统
先存构造
构造样式
两期伸展
Qiongdongnan Basin
fault system
pre-existing weakness
structural style
two-phase extension
