松辽盆地长岭断陷火山活动与烃源岩成烃史分析  

Volcanic Activities and Hydrocarbon-generating History in the Changling Fault Depression,Songliao Basin

作　　者：闫相宾[1] 金晓辉[1] 李丽娜[1] 马晓娟[1] 赵春满 

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国石油化工股份有限东北油气分公司,长春130062

出　　处：《地质论评》2009年第2期225-230,共6页Geological Review

摘　　要：长岭断陷SN109井地震层序地层表明断陷期主要存在三次较大规模的火山活动。烃源岩在3次热事件的长期作用过程中,有机质在沉积初期就处于较高的热演化环境中,加速了有机质的成熟过程。沙河子组—营城组烃源岩约在122Ma(登娄库组沉积末期)埋深1500m,Ro达到0.5%,烃源岩开始生烃,此时,还没有有效的盖层;119Ma时(泉头组沉积末期),烃源岩约埋深2000m,Ro大于1.3%,进入生气高峰和油裂解气阶段,泉二段盖层刚刚形成,天然气以散失为主,约95Ma(青山口组沉积末期)泉二段和青一、二段有效盖层形成,营城组烃源岩热演化Ro达到1.3～2%,油裂解气和高成熟天然气大量聚集,现今气藏中的天然气应以干气为主,勘探方向应加强盆地坳陷和斜坡区古构造,古气藏研究。The seismic stratigraphy of the well SN109 shows that the Changling fault depression has three relatively large volcanic activities during rift faulting. Under the three hot events, organic matters were in higher thermal evolution environment during the early stage of deposition, which speeded up maturation of source rocks. Shahezi and Yingcheng Fro. began to generate hydrocarbon in about 122Ma （late Denglou Fro. ） at a burial depth of 1500m, and the Ro value reached 0. 5%,hut at that time, there were no effective eaprocks. When the Ro value reached 1.3% in 119Ma（late Quantou Fro. ） at a burial depth of 2600m, source rocks entered the peak of gas generation and pyrolysis gas stage. At the same time, the caprock of Quan-2 Member had just deposited, natural gas were primarily dispersion. When the Ro value reached 1.3~//0~2~~ at 95Ma（late Qingshankou Fro. ）, the caprock of Quan-2 and Qing-1 ,Qing-2 Member deposited, and a large quantity of pyrolysis gas and high maturity natural gas accumulated. Now the natural strengthen gases in the reservoir are the study of paleostructure mainly dry gas. The and gas reservoir at the exploratory direction in this area should basin depression and slope.

关 键 词：烃源岩 火山活动 生烃演化史 长岭断陷 松辽盆地 

分 类 号：P618.13[天文地球—矿床学]