琼东南盆地宝岛凹陷北坡断裂体系新认识及与天然气成藏关系

New Explanation of Fault System in Baodao Sag′s Northern Slope of Qiongdongnan Basin and Its Affect for Natural Gas Accumulation

琼东南盆地宝岛凹陷北坡存在近SN向走滑断裂,改变了前人对琼东南盆地断裂体系的认知。通过切取三维地震相干体的时间切片,落实了走滑断裂的实际走滑距离;利用断裂生长指数推断出走滑断裂的构造应力方向及走滑断裂的活动期次,并通过分析走滑断裂对烃源、储层物性、油气运聚、成藏等影响作用,认为琼东南盆地宝岛凹陷北坡将是未来有利的勘探区域。

The S-N directional strike-slip faults, which are integrated at the northern slope of the Baodao sag in Qiongdongnan basin, change the previous recognition about the basinrs fault system. We use the 3D time slice of seismic coherence body to measure the real distance of the strike-slip fault. Depended on fault activity index, we determine the structural stress direction and deduce the activity stages of the strike-slip fault. Based on taking the effect of the strike-slip fault on source kitchen,reservoir property,gas migration and accumulation,we consider that the northern slope of the Baodao sag would be a potential province for future petroleum exploration.