摘要
利用现有井资料,通过碳、氦和氩等同位素分析,并结合烃源岩的演化、构造发育史和天然气成藏史分析,对柴达木盆地鄂博梁Ⅲ号构造天然气的成因类型和成藏特征进行了系统的研究。结果表明,鄂博梁Ⅲ号构造天然气为典型煤型气,气藏中甲烷和乙烷的反序现象是由成藏过程中混入不同成熟度的天然气所致。天然气主要源于深部过成熟的侏罗系烃源岩,断裂活动是控制天然气藏形成和演化的重要因素,提出了断裂—输导层输导源上成藏模式。
Use the existing wells data,this paper systematically analyzed the natural gas genetic type and accumulation characteristics in the Erboliang Ⅲ structure based on the analysis of the characteristics of Ca,He and Ar isotopes analysis,integrated with the hydrocarbon source rock evolution,structural development and natural gas accumulation history.The results show that the nature gas in Erboliang Ⅲ structure is typically coal-related gas.The reverse sequence phenomenon of methane and ethane in the gas reservoir is resulted from mixed natural gas with different maturity in the process of gas accumulation.The natural gas mainly came from the deep over-matured Jurassic hydrocarbon source rocks.The faulting activities play an important role in controlling the formation and evolution of the nature gas reservoir.The natural gas accumulation model could be described as the up-source accumulation model for the fault-Transport layer type.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2014年第1期17-22,共6页
Xinjiang Petroleum Geology
基金
国家973项目(2011CB201100
2006CB202308)
国家科技重大专项(2011ZX05006-006)
关键词
柴达木盆地
天然气
成因类型
成藏特征
构造演化史
鄂博梁Ⅲ号构造
Qaidam basin
natural gas
genetic type
gas accumulation characteristic
structural evolution history
Erboliang Ⅲ structure
