| 南海北部琼东南盆地BD-2井中新世有孔虫生物地层及沉积环境 |
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| 作者单位： | ;1.中海油能源发展股份有限公司工程技术分公司;2.中国科学院资源地层学与古地理学重点实验室(中国科学院南京地质古生物研究所);3.中国科学院大学;4.中海石油(中国)有限公司湛江分公司 |
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| 摘 要： | 南海北部琼东南盆地BD-2井中新世地层沉积连续,是琼东南盆地中新统较典型的钻井剖面之一。该井中新世地层中含丰富的有孔虫化石,共鉴定有孔虫62属98种,其中浮游有孔虫13属41种,底栖有孔虫49属57种。根据有孔虫标志种及螺旋浮游有孔虫旋向优势度的变化,对该井的有孔虫生物地层进行了详细划分,从早中新世至晚中新世共识别出11个有孔虫化石带或联合化石带。探讨了下中新统与中中新统,中中新统与上中新统界线的有孔虫划分标志。依据有孔虫丰度、分异度及组合特征,讨论了BD-2井从早中新世至晚中新世沉积环境演化特征。
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| 关 键 词： | 有孔虫 生物地层 沉积环境 中新世 琼东南盆地 南海北部 中国 |
MIOCENE FORAMINIFERA STRATIGRAPHY AND PALAEOENVIRONMENT OF WELL BD-2 IN THE QIONGDONGNAN BASIN,NORTHERN SOUTH CHINA SEA,CHINA |
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| Affiliation: | ,CNOOC Energy Technology & Services Limited,Engineering Technology Branch,Key Laboratory of Economic Stratigraphy and Palaeogeography,Chinese Academy of Sciences(Nanjing Institute of Geology and Palaeontology),University of Chinese Academy of Sciences,Zhanjiang Branch of CNOOC Ltd.,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Zhanjiang Central Laboratory of CNOOC Energy Technology & Services Limited,Eng |
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| Abstract: | Well BD-2is one of the typical Miocene section in the Qiongdongnan Basin,northern South China Sea.Abundant foraminifera are found in the well.98 foraminiferal species referred to 62 genera were identified,of which41 species in 13 genera belong to planktonic foraminifera,57 species in 49 genera belong to benthic foraminifera.Eleven zones or combine zones are recognized based on planktonic foraminifera events and coiling change of the spiral foraminifera.The boundaries of the Lower Miocene to Middle Miocene and Middle Miocene to Upper Miocene are discussed.The evolution of sedimentary environments at the bore hole from the Early to Late Miocene is also discussed in detail according to the statistics of foraminiferal abundance and diversity,percentage of planktonic foraminiferal and foraminiferal assemblage characteristics. |
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| Keywords: | Foraminifera stratigraphy palaeoenvironment Miocene Qiongdongnan Basin northern South China Sea China |
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