摘要
四川盆地巫溪地区五峰组-龙马溪组是中国页岩气的勘探重点层系,其中发育大量硅质岩。基于对田坝剖面五峰组和龙马溪组51件硅质岩样品的主量元素和稀土元素分析,并结合岩石学、古生物等资料,对五峰组-龙马溪组硅质来源与沉积背景开展了对比分析。结果表明,巫溪地区五峰组-龙马溪组硅质岩形成于大陆边缘环境,远离热液活动中心,整体上受陆源碎屑影响,且龙马溪组硅质岩受陆源碎屑影响大于五峰组;此外,五峰组硅质来源主要为硅质生物,局部受到热液活动影响,而龙马溪组硅质来源则受硅质生物和陆源碎屑的双重影响。
Cherts are widely deposited in the Wufeng and Longmaxi formations,which are key strata for exploring shale gas reservoir,in the Wuxi area,Sichuan Basin.In this study,51samples of bedded cherts from the Wufeng and Longmaxi formations of at the Tianba section in the Wuxi area were analyzed for major,trace elements and REE.Combining with the petrological and paleontological data,we have conducted detailed analogical study on the origin and depositional environment of cherts from the Wufeng and Longmaxi formations in this area.Results show that cherts of the Wufeng and Longmaixi formations in the Wuxi area were formed in the continental margin environment,which is far away from the hydrothermal activity center,with overall influence of terrestrial debris.Cherts of the Longmaxi Formation are more influenced than those of the Wufeng Formation by terrestrial debris.In addition,cherts of the Wufeng Formation are mainly composed of siliceous organisms,with local influence of hydrothermal activity,whereas cherts of the Longmaxi Formation are composed of both siliceous organisms and terrestrial debris.
作者
邱振
谈昕
卢斌
陈留勤
QIU Zhen;TAN Xin;LU Bin;CHEN Liu-qin(Research Institute of Petroleum Exploration &Development,Bcijing100083,China;National Energy Shale Gas Research &Development(Experiment)Center,Langfang Hebei 065007,China;School of Earth Science,East China University of Technology,Nanchang 330013,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2018年第5期880-887,共8页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
国家自然科学基金项目(41602119)
中石油科技开发项目(2016B-0302-01)
中石油勘探开发项目(XN41601,XN41603)
国家重大专项(2017ZX05035001)
关键词
硅质岩
五峰组
龙马溪组
地球化学
巫溪地区
四川盆地
chert
Wufeng Formation
Longmaxi Formation
geochemistry
Wuxi area
Sichuan Basin
作者简介
邱振(1984-),男,博士,工程师,研究方向:地球化学、沉积学、石油地质学.E-mail:qiuzhen316@163.com.
