源外隆起区油气成藏与分布主控因素及模式——以松辽盆地杏北地区扶余油层为例

在油气藏类型及分布规律研究的基础上,采用油气分布与成藏条件叠合分析方法,对杏北地区扶余油层油气成藏与分布主控因素及模式进行了研究。结果表明,杏北地区扶余油层油气主要分布于中央背斜带北部和南西斜坡区。中央背斜带北部扶余油层油气成藏与分布主控因素为：①断裂侧向输导为油气聚集提供了运移通道;②北部背斜构造高部位是油气聚集成藏的有利部位。南西斜坡区扶余油层油气成藏与分布主控因素为：①水下分流河道砂体为油气侧向输导并聚集提供了运移通道;②反向断裂规模控制着油气富集程度。油气成藏有2种模式：①断裂侧向输导背斜构造高部位油气聚集成藏模式,主要分布于中央背斜带北部;②砂体侧向输导反向断裂遮挡油气聚集成藏模式,主要分布于南西斜坡区。

Main controlling factors and models of oil and gas accumulation and distribution in uplift area outside source rock: An example from Fuyu oil layer in Xingbei area, Songliao Basin

Based on the study of reservoir types and distribution law, this paper studied the main controlling factors and models of oil and gas accumulation and distribution of Fuyu oil layer in Xingbei area by comprehensive analysis of oil and gas distribution and accumulation conditions. The result shows that oil and gas of Fuyu oil layer mainly distribute in the north of central anticline zone and in southwest of Xingbei area. The oil and gas accumulation and distribution of Fuyu oil layer in the north of central anticline structure zone is controlled by following two factors： ①lateral transporting of fault provides migration pathway for oil and gas accumulation;②the high position of anticline structure in the north is favorable for oil and gas to accumulate. The oil and gas accumulation and distribution of Fuyu oil layer in the southwest of Xingbei area is controlled by following two factors： ①lateral transporting of sand bodies provides migration pathway for oil and gas accumulation; ②antithetic fault controls oil and gas enrichment. There are two oil and gas accumulation models in Xingbei area： one is that oil and gas migrate through faults and accumulate in high position of anticline structure, and mainly distribute in the north of central anticline structure zone; the other is that oil and gas migrate through sandbodies and are sealed by antithetic faults, and mainly distribute in the southwest of Xingbei area.