巴彦塔拉油田油气主控因素与成藏模式

Controlling factors and patterns for hydrocarbon accumulation in Bayantala oil field

通过解剖典型油气藏并结合成藏条件,分析巴彦塔拉油田油气分布规律及成藏过程.结果表明,巴彦塔拉油田油气成藏及分布主要受主力烃源岩的分布范围、断层在不同时期的输导和封堵作用,以及不整合面空间展布的控制.在主力烃源岩分布范围、断层在不同时期的输导和封堵作用、不整合面的空间展布等主控因素作用下,油气运聚具有油气沿断层短距离运移源内断块、断层遮挡、断层-岩性圈闭油气成藏模式、油气沿断层长距离运移源外断块圈闭油气成藏模式,以及油气沿断层或不整合面侧向运移源外基岩风化壳、断块、断层-岩性圈闭3种油气成藏模式.

By detailed analysis of distribution and accumulation of discovered oil and gas pools,combining with different pooling conditions study,this paper reveals that the main controlling factors for oil and gas accumulation in Bayantala oil field include distribution range of main hydrocarbon sources,transfer and sealing action of faults at different time,and spatial distribution of unconformity surface.Under control of these controlling factors,Bayantala oil field can have three patterns for hydrocarbon accumulation,they are patterns of hydrocarbon migrates along faults in short distance into fault block traps,fault screened traps and fault-litho traps which inside source range,hydrocarbon migrates along faults in long distance into fault block traps which outside source range,and hydrocarbon migrates along faults and unconformities into basement weathered crust traps,fault block traps,and fault-litho traps which outside source range.