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南海南部廷贾-西巴兰线断裂是一条规模巨大的北西向走滑断裂,渐新世开始活动,早期具有强烈的右旋走滑特征,晚中新世以来走滑方向变为左旋,更新世至今,走滑方向变为右旋,是曾母盆地与北康盆地、南沙海槽的分界。为了理清廷贾-西巴兰线断裂特征与曾母盆地油气成藏的关系,通过对断裂两侧地震剖面特征、重磁特征、地热流分布特征以及地壳性质和岩石圈厚度的分析,探讨该断裂在曾母盆地形成演化及油气成藏中的控制作用。研究表明:断裂活动为曾母盆地后期的沉积提供了丰富的物源,断裂走滑作用导致曾母盆地具有良好的圈闭,后期的反向走滑使得盆地的沉积中心由南向北迁移;断裂沟通深部热源,有利于油气生成,形成的伴生断层是盆地油气运移的主要通道。
The Tinga-Sibaran line fault in the southern South China Sea is a large north-west strike-slip fault that started in the Oligocene with a strong right-lateral strike-slip feature in the early stage. Since the Late Miocene, the strike-slip direction has changed to L-rotation and renewed Since the end of the world, the direction of strike-slip has become right-handed and is the boundary between Zengmu Basin and the Beikang Basin and the Nansha Trough. In order to clarify the relationship between the fault characteristics of Tinga-Xibaland line and the hydrocarbon accumulation in the Zengmu Basin, this paper analyzes the seismic profile characteristics, gravity and magnetic characteristics, geothermal flow distribution characteristics, crustal properties and lithosphere thickness on both sides of the fault The fault controlled the formation and evolution of the Zengmu Basin and the hydrocarbon accumulation. The results show that the fault activity provided a rich source of sediments for the late Zengmu Basin. The fault slip resulted in a good trapping of the Zengmu Basin, and the reverse strike-slip in the later period resulted in the migration of sedimentary centers from south to north. Fractures communicate with deep heat sources and are favorable to the formation of oil and gas. Associated faults formed are the main channels for oil and gas migration in the basin.