榆树林葡萄花油层油气富集规律主控因素

Main factors controlling oil-gas enrichment regularities of Putaohua oil layer in Yushulin

为研究榆树林地区葡萄花油层的油气富集规律，对葡萄花油层顶面古构造进行恢复，并分析深大断层及烃源岩对油气富集的控制作用．结果表明：在尚家鼻状构造南部存在一个古鼻状构造，该鼻状构造和尚家鼻状构造的演化在油气运移时期使它们的轴部、两翼及邻凹斜坡为有利的油气聚集带；在构造演化控制下，与油气主运方向垂直、高角度斜交的大型反向正断层和大断距顺向正断层邻凹侧为有利的富油区；在成熟烃源岩控制范围内，以垂向运移为主的油气容易在邻凹侧聚集在低熟～未熟烃源岩控制范围内油气供应不足，加之受侧向运移通道的限制，很难向构造高部位运移，导致构造高部位的尚家地区含油性差．

In order to clarify the gas enrichment regularities of Putaohua oil layer in Yushulin area,a palaeostructure recovery of Putaohua top as well as a detailed analysis about the control action of discordogenic faults and hydrocarbon source rocks to gas enrichment regularities were carried out.The results showed that there is an ancient nosing structure in the southern of the Shangjia nose-shaped structure,the evolution of the ancient nose-shaped structure and the Shangjia nose-shaped structure make their axial region,two limbs and adjacent concave slope favorable gas accumulation zone in the period of gas migration.Under the control of the structural evolution,adjacent to the concave of the high-angle diagonal large antithetic centripetal fault and large amplitude consequent centripetal fault that perpendicular to the main direction of gas migration can form favorable gas accumulation zone.At the same time,within the control of mature hydrocarbon source rock,the gas that mainly in the way of vertical migration can easily accumulate adjacent to the concave,and within the control of mature-immature hydrocarbon source rock,the gas is short of supply,coupled by the restrictions of parallel migration channels,it is difficult to migrate upward,so the oil in Shangjia area that lie in the structural high is of poor oil-bearing property.