摘要
松辽盆地徐家围子断陷深层早白垩世发育两个大的火山喷发—沉积旋回,分别是营城组一段与营城组三段。每一喷发旋回都具有多期活动、间歇性喷发的特点,且各期次火山岩在空间上存在复杂的叠置关系。根据区内火山活动特点、火山岩相序及岩石韵律组合特征,结合喷发间歇期沉积地层与火山岩接触关系,将营城组一段和三段分别划分为3个喷发期次,自下而上依次为Yc11、Yc12、Yc13、Yc31、Yc32、Yc33。不同喷发期次的火山岩在很多方面都有所不同,表现在构造特征、岩相特征、岩性组成、储层类型、油气藏类型和富集程度的差异。营城组火山岩喷发期次的划分,对于查明区域火山岩活动规律、研究火山岩相带展布特征、油气分布及富集规律都具有重要意义。
Two large volcanic-sedimentary cycles developed in Early Cretaceous in deep Xujiaweizi Fault Depression in Songliao Basin,i.e.the first and third members of Yingcheng Formation.Each volcanic cycle features in multi-period and intermittent eruption,and the volcanic rocks of each period are overlaid spatially.According to the volcanic characteristics,volcanic phase sequence,and rock rhythm combination characteristics,combined with the correlation between sedimentary formations and volcanic rocks at the intermittent period,the first and third members of Yingcheng Formation are divided into three eruption periods,i.e.Yc11,Yc12,Yc13,Yc31,Yc32,and Yc33 from bottom to top.Volcanic rocks of different eruption periods vary a lot in structure,facies,lithological composition,reservoir types,and degree of oil and gas enrichment.The division is of great significance to the identification of the law of regional volcanic activity,the study on distribution of volcanic facies,and the oil and gas distribution and enrichment.
出处
《中国石油勘探》
CAS
2009年第2期6-13,共8页
China Petroleum Exploration
基金
中国石油天然气集团公司科技攻关项目"岩性地层油气藏富集规律与勘探技术研究"(2008B-0100)
中国石油勘探开发研究院青年创新基金项目"松辽盆地深层火山岩分布规律及火山岩岩性气藏识别技术研究"
关键词
徐家围子断陷
营城组
火山岩
火山喷发
期次
划分
意义
Xujiaweizi Fault Depression
Yingcheng Formation
volcanic rocks
volcanic eruption
period
division
significance
