黔北习科1井五峰组―龙马溪组黑色页岩的地层划分与对比  

STRATIGRAPHIC SUBDIVISION AND CORRELATION OF THE WUFENG AND LUNGMACHI BLACK SHALES FROM XIKE-1 DRILLCORE IN NORTHERN GUIZHOU PROVINCE, SOUTH CHINA

作　　者：武学进 陈清[1] 李关访[3] 樊隽轩 李超 张元动[1,5] 王媛 杨娇[4] 孙宗元 WU Xue-jin;CHEN Qing;LI Guan-fang;FAN Jun-xuan;LI Chao;ZHANG Yuan-dong;WANG Yuan;YANG Jiao;SUN Zong-yuan(State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment,Chinese Academy of Sciences,Nanjing 210008;University of Science and Technology of China,Hefei 230026;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023;University of Chinese Academy of Sciences,Beijing 100049;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation(Chengdu University of Technology),Chengdu 610059;Institute of Sedimentary Geology,Chengdu University of Technology,Chengdu 610059)

机构地区：[1]中国科学院南京地质古生物研究所和生物演化与环境卓越创新中心,现代古生物学和地层学国家重点实验室,江苏南京210008 [2]中国科学技术大学,安徽合肥230026 [3]中国科学院地质与地球物理研究所,北京100029 [4]南京大学地球科学与工程学院,江苏南京210023 [5]中国科学院大学,北京100049 [6]油气藏地质及开发工程国家重点实验室(成都理工大学),四川成都610059 [7]成都理工大学沉积地质研究院,四川成都610059

出　　处：《地层学杂志》2020年第1期1-11,共11页Journal of Stratigraphy

基　　金：国家重大专项(2017ZX05035002-001、2017ZX05036001-004);国家自然科学基金(U1562213、41972162、41725007);地质调查项目(DD20190009)联合资助;“IGCP653”项目(奥陶纪生物大辐射的启动过程)系列成果之一。

摘　　要：习科1井是位于黔北习水县良村镇的一口科研勘探井,该钻井由志留系石牛栏组钻至奥陶系涧草沟组。通过对习科1井五峰组-龙马溪组黑色页岩中的笔石进行系统鉴定和生物地层划分,判断该井奥陶纪-志留纪之交地层序列完整连续。该钻井五峰组中可识别出Paraorthograptus pacificus带(WF3),之上见富含腕足类的观音桥层,再向上为龙马溪组黑色页岩,其中自下而上可识别出Metabolograptus?persculptus-Akidograptus ascensus带(LM1-LM2)、Parakidograptus acuminatus带(LM3)、Cystograptus vesiculosus带(LM4)、Coronograptus cyphus带(LM5)和Demirastrites triangulatus带(LM6)。习科1井奥陶纪-志留纪之交笔石生物地层序列基本完整,可与桐梓凉风垭、韩家店对比;而与桐梓红花园、戴家沟不同,后两者缺失了Metabolograptus?persculptus带至Parakidograptus acuminatus带。同时其龙马溪组顶界符合从桐梓向北经习水-綦江,至四川华蓉山依次升高的规律,进一步验证了黔渝地区龙马溪组黑色页岩的"阶段性渐进展布模式"。Xike-1 drillcore is a scientific research and exploration well in Liangcun Town,Xishui County,northern Guizhou Province,which was drilled from the Silurian Shiniulan Formation to Ordovician Jiancaogou Formation.By systematic identification of the graptolites in the black shale and biostratigraphic division,the complete sequence of the Ordovician-Silurian transition in this area was determined.With the identification and analysis of the graptolites from the Xike-1 drillcore,Paraorthograptus pacificus zone(WF3)in Wufeng Formation,Kuanyinchiao Bed rich in brachiopods above the Wufeng Formation,Metabolograptus?persculptus-Akidograptus ascensus zone(LM1-LM2),Parakidograptus acuminatus zone(LM3),Cystograptus vesiculosus zone(LM4),Coronograptus cyphus zone(LM5)and Demirastrites triangulatus zone(LM6)in the Lungmachi Formation were recognized.Graptolite biostratigraphic sequence through the Ordovician and Silurian boundary in the Xike-1 drillcore is complete and continuous,which correspond to the Liangfengya section and Hanjiadian section in Tongzi County,but differs from the Honghuayuan section and the Daijiagou section,both of which miss Metabolograptus?persculptus zone-Parakidograptus acuminatus zone.On the other hand,from south to north,from Tongzhi,Xishui,Qijiang to Huayingshan,the top boundary of the Lungmachi Formation rises progressively,which conforms with the"Stage-progressive distribution pattern"of black shale in Guizhou and Chongqing area.

关 键 词：笔石 奥陶系 志留系 生物地层 页岩气 地层分布 

分 类 号：P534.42[天文地球—古生物学与地层学] P534.43[天文地球—地质学]