CAJ | 학술논문

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。
재대이、삼유지진자료계통해석적기출상，통과불동구역단층분포특정화연화급분지결구적차이성분석，장경동남분지북부요함대화분위량개단렬계통(동부단렬계통화서부단렬계통)급8개자계통，병천술분석료각자단렬계통적단층분포특정화규률。재이용평형부면기술，연구분석료경동남분지단렬계통적연화계단화단층적활동기차，학정“장기활동형”、“조쇠형”、“중기활동형”(분“중기활동Ⅰ형”화“중기활동Ⅱ형”)、“만성형”등4개계렬적단층점주도지위。분석학정경동남분지복잡적단렬계통시재선존구조조건하，량기불동방향신전변형첩가이성，기중남북향신전적체진변형기주도작용；불동구역선존구조분포화활동적차이시조성경동남분지단렬계통복잡성적근본원인。
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.