合肥盆地钻井地层的同位素测年与地层划分  

ISOTOPIC DATING AND STRATIGRAPHIC DIVISION OF THE STRATA ENCOUNTERED BY BOREHOLES IN THE HEFEI BASIN

作　　者：徐春华 [1] 朱光 [2] 刘国生 [2] 谢成龙 [2] 王勇生 [2] 李长城 [2] 

机构地区：[1]中国地质大学(武汉)研究生院,湖北,武汉,430074,胜利油田有限公司勘探项目管理部,山东,东营,257001 [2]合肥工业大学资源与环境工程学院,安徽,合肥,230009

出　　处：《安徽地质》2005年第4期251-255,共5页Geology of Anhui

摘　　要：合肥盆地内部中、新界地层大面积被第四系覆盖,其地层的时代与划分主要依赖已有的6口深井地层资料.由于缺乏可靠的化石记录,这6口深井地层时代与划分一直存在着很大的分歧,制约了对该盆地的油气勘探与远景评价.本文利用这6口深井泥岩类岩屑中自生伊利石,在其结晶度分析基础上,进行了K-Ar同位素测年,成功地获得了不同深度上的地层形成时代.据此地层年龄,文中对这6口深井所钻遇的地层进行了重新的划分.Meso-Cenozoic strata are largely covered with Quaternary strata in the Hefei basin. Ages and divisions of the strata mainly depend on stratigraphic data from 6 deep drill-holes in the basin. These ages and divisions have been in debate for a long time due to lack of reliable fossil records, thus restricting hydrocarbon prospecting and evaluation for the basin. After illite crystallinity analysis, authigenic illite samples from mudstone chips in the deep drill-holes were used for K-Ar dating, stratigraphic ages for the different depths were successfully obtained. On the basis of these isotopic ages, new stratigraphic divisions were proposed for the strata met by 6 deep drill-holes.

关 键 词：钻井 自生伊利石 K-AR 同位素年龄 地层划分 合肥盆地 

分 类 号：R597[医药卫生—内科学]