松辽盆地扶杨油层油气成藏期次和时限确定  

Determination of oil/gas entrapment stage and time in Fuyang Reservoir of Songliao Basin

作　　者：闫建萍[1,2] 刘池洋[1] 郭桂红[2] 

机构地区：[1]西北大学含油气盆地研究所大陆动力学国家重点实验室,陕西西安710069 [2]兰州大学资源环境学院,甘肃兰州730000

出　　处：《兰州大学学报（自然科学版）》2008年第5期26-29,共4页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展计划项目(2003CB214607);教育部长江学者和创新团队发展计划项目(IRT0559)资助．

摘　　要：储层粘土矿物中自生伊利石K-Ar年龄测定表明:松辽盆地齐家—古龙凹陷扶杨油层油气充注时间大致分为3个阶段,70.75～72.32 Ma,相当于嫩江组沉积末期;40.5～51.3 Ma,相当于依安组沉积早期;34.7～37.5 Ma,相当于依安组沉积末期.分析油藏形成时间与构造抬升的关系认为:受早期构造抬升的控制,扶杨油层在早期构造抬升的晚期快速成藏;由于晚期构造运动持续时间较长,为40.5～51.3 Ma,发育超压系统的上覆青一段泥岩由于压力超过泥岩承受的极限,导致超压的破裂,形成第二期油气成藏;晚期构造抬升的末期,形成最后一期油气充注.The K-Ar dating of the authigenic illite in clay minerals suggested that there had been three stages of hydrocarbon injections in the Fuyang Reservoir, Songliao Basin, and the K-At ages of the three stages were 70.75～72.32 Ma （in the end of K1n）, 40.5～51.3 Ma （E1^1） and 34.7～37.5 Ma （E1^2） respectively. Therefore, the relationship between the timing of oil entrapment and the tectonic upwellings could be revealed： firstly, the Fuyang Reservoir was rapidly formed at the end of early tectonic upwelling; secondly, due to the later continuous tectonic movement, the mudstone of the Qingshangkou Formation was fissured under the high upper-pressure, and the second stage oil/gas reservoir was formed; thirdly, the last stage oil injection finished at the end of late tectonic upwelling during 34.7～37.5 Ma.

关 键 词：自生伊利石 K—Ar测年 扶杨油层 成藏年代 

分 类 号：P618.13[天文地球—矿床学]