辽河盆地东部凹陷北部地区断层对油气成藏的控制作用

CONTROL OF FAULTS ON HYDROGEN ACCUMULATION IN NORTHERN AREA OF EAST DEPRESSION OF LIAOHE BASIN

依据烃源岩的分布特征和断裂活动期次探讨了辽河盆地东部凹陷北部地区佟二堡断层和茨东断层对牛居长滩洼陷的控制作用。依据石油运移地球化学资料和油气分布特征 ,研究了牛青断层和茨西断层对油气运移的控制作用。结果表明 ,北部地区油气以沿断层垂向运移方式为主 ,以侧向运移为辅。据此建立了油气沿断裂运移的模式 ,并预测了有利的油气聚集区域。预测结果表明 ,该区油气藏类型多与断层有关 ,主要圈闭类型为断块和断鼻型。茨东断层和牛青断层之间区域以及沈旦堡 -头台子地区为有利勘探区。

The Liaohe Basin is a rift-subsidence basin with strong fault activities. The fault activities are closely related to the origin and the distribution of oil and gas. On the basis of distribution of source rocks and the activity stages of faults, the controlling action of the Tongerbao and Cidong faults on the forming and devolvement of the Niuju-Changtan sag in the northern area of east Depression of the Liaohe Basin was investigated. According to geochemical data and hydrocarbon distribution properties, the control of Cixi fault and Niuqing fault on oil and gas migration was analyzed. The results showed that oil and gas mainly migrated along the vertical direction of the faults, and less oil and gas migrated in the lateral direction of the studied area. The hydrocarbon migration patterns along the faults were determined, and the favorable prospecting targets were predicted. The types of hydrocarbon reservoirs are controlled by the faults. The main patterns of traps are faulted block. The favorable prospecting targets are in the area between the Cidong fault and Niuqing fault as well as the Shendanbao-toutaizi area.