高邮凹陷南断阶断层活动对油气成藏的控制

在定量研究高邮凹陷油气主要运移期晚始新世三垛组沉积期断层活动强度和活动规律的基础上，系统分析了高油凹陷南断阶该时期断层活动对油气成藏的控制作用。研究结果表明，三垛组沉积早期活动断层数量较多，晚期单条活动断层的活动强度较大，三垛组沉积期活动的主干断层和次级断层是油气纵向运移的主要通道。南断阶西部三垛组沉积期断层活动强度大于东部，断层活动强度的差异控制着油气藏分布的差异。

The Control Effect of Fault Activity on Hydrocarbon Accumulation in South Terrace of Gaoyou Sag

Sanduo epoch of late Eocene is the main time for hydrocarbon migration in south terrace of Gaoyou sag. On the basis of the analysis of fault activity intensity and regularity, its effect on controlling the hydrocarbon accumulation is studied. The results show that many active faults existed in early Sanduo epoch, and the single fault activity was in high intensity in late Sanduo epoch. Both the major fault and the sub-fault became the passages for longitudinal hydrocarbon migration. In the south terrace, the Sanduo fault activity intensity in its west was higher than that in its east. Such a difference of fault activity controlled the distribution of petroleum reservoirs in this area.The fault activity intensity in westward is larger than it in eastward, and the difference of the distributions of oil-gas reservoirs is determined by fault activity intensity.