摘要
乌尔逊凹陷断裂主要在兴安岭群-南屯组沉积时期、大磨拐河组-伊敏组沉积早期、伊敏组沉积晚期和伊敏组沉积末期-青元岗组沉积早期活动.利用断裂走向与区域主压应力方向之间夹角大小,对乌尔逊凹陷不同构造活动时期断裂输导能力进行了定量评价,得到在兴安岭群-南屯组沉积早期和伊敏组沉积晚期2个时期断裂输导能力相对较强,而大磨拐河组-伊敏组沉积时期和伊敏组沉积末期-青元岗组沉积早期断裂输导能力相对较弱.乌尔逊凹陷目前已获得的工业油流井均分布在断裂附近,这些断裂在主要油气运聚时期——伊敏组沉积晚期主要为较强和强的输导能力,为南一段源岩生成排出油气向储集层运移提供了良好通道,这是乌尔逊凹陷油气藏得以形成的重要原因.
Faults in Wuerxun depression moved from Xinganling group to Nantun formation, from Dameguaihe formation to the early of Yimin formation, in the later of Yimin formation and from the end of Yimi formation to the early of Qingyuangang formation. Using the angle between the orientation maximum principle compressive stress and the strike direction of faults, the transporting ability of faults in Wuerxun depression was evaluated. The transporting ability of faults from Xinganling group to Nantun formation and in the later of Yimin formation was stronger, but the transporting ability of faults was weaker from Damoguaihe formation to the early of Yimin formation and from the end of Yimin formation to the early of Qingyuangang formation. Industrial oil-gas wells in Wuerxun depression distributed near faults, these faults have stronger and the strongest transporting ability in main migration-accumulation period, the later of Yimin formation. These faults provided transporting pathways for oil-gas from K1n1 sourcerock to migrate into reservoir. That is why oil-gas reservoirs can be formed in Wuerxun depression.
出处
《大庆石油学院学报》
CAS
北大核心
2008年第4期5-8,共4页
Journal of Daqing Petroleum Institute
基金
国家重大基础研究(973)资助项目(2001CB209104)
关键词
乌尔逊凹陷
构造活动时期
断裂
输导能力
评价
Wuerxun depression
active structure period
fault
transporting ability
evaluation
