摘要
通过岩心观察、薄片鉴定、测井和录井等资料分析,结合地震资料解释,对准噶尔盆地西北缘中拐凸起—五、八区石炭系、二叠系的火山岩岩相进行了研究,在单井相分析、剖面相分析的基础上,作出了研究区石炭系和二叠系佳木河组下亚组的岩相分布平面图:石炭系主要是火山岩,在东北部、中部和西南角为安山岩,东部广大区域和南部为凝灰岩,西南部为火山-沉积岩,西北部为安山岩、凝灰岩、火山-沉积岩等多种岩性,火山角砾岩和玄武岩零星分布于西部偏北部位。二叠系佳木河组下亚组分为2段,从下到上,岩性与石炭系虽然有一定的继承性,但其上段岩相表现为火山-沉积岩增多而凝灰岩减少、安山岩增多而玄武岩减少,可能是火山活动趋于减弱和停止的缘故。
The core observation,slices appraisal,well-logging and logging data analysis are conducted for study of volcanic lithologies of Carboniferous and Permian from Zhongguai swell to District-5 and District-8 in northwestern margin of Junggar basin,combining with seismic data interpretation.On the basis of single well facies and section facies analyses,the plane distribution map of lithofacies of Carboniferous and sub-group of Jiamuhe formation of Permian is plotted.The Carboniferous in this area is dominated by volcanic rocks,with some andesites in the northeast,central and southwest;tuff in vast east area and the south,volcanic-sedimentary rocks in the southwest,these multi-rocks in the northwest,and volcanic breccia and basalt scattered near the west.The sub-group of Jiamuhe is also divided into two sections,from bottom to top,the rocks has some continuity with Carboniferous,but the lithofacies of upper section shows increase of andesite and volcanic-sedimentary rocks,and decrease of basalt and tuff,which may owing to volcanic activity tending to diminish and cease.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2011年第1期7-10,共4页
Xinjiang Petroleum Geology
基金
国家科技重大专项(2008ZX05008-003-04)
关键词
准噶尔盆地
西北缘
中拐凸起
石炭系
二叠系
火山岩
Junggar basin
northwestern margin
Zhongguai swell
Carboniferous
Permian
volcanic rock
