| 松辽盆地海侵事件——松科1井钙质超微化石新证据 |
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| 引用本文： | 曹文心,席党鹏,黄清华,程祎,屈海英,高莲凤,万晓樵.松辽盆地海侵事件——松科1井钙质超微化石新证据[J].地质通报,2016,35(6):866-871. |
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| 作者姓名： | 曹文心 席党鹏 黄清华 程祎 屈海英 高莲凤 万晓樵 |
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| 作者单位： | 1. 中国地质大学(北京)生物地质与环境地质国家重点实验室, 北京 100083;2. 中国科学院南京地质古生物研究所现代古生物学与地层学国家重点实验室, 江苏 南京 210008;3. 大庆油田勘探开发研究院, 黑龙江 大庆 163712;4. 华北理工大学矿业工程学院, 河北 唐山 063009 |
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| 基金项目： | 国家重点基础研究发展计划项目(编号:2012CB822002)、国家自然科学基金项目(批准号:41302008、41172015、41172037)、中国地质调查局项目(编号:1212011120145)和现代古生物学与地层学国家重点实验室开放基金项目(编号:2011011) |
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| 摘 要： | 松辽盆地作为中国最大的陆相含油气盆地,是否发生过海水侵入一直存在争议,化石能为该科学问题提供直接解释。在松科1井嫩江组一、二段发现了少量的钙质超微化石,初步鉴定出Calculites obscurus,Calculites ovalis,Quadrum sp.,Micula sp.等属种。上述钙质超微化石广泛分布于晚白垩世海相地层中,通过与国际标准海相化石的对比,将嫩江组一段中、下部的时代限定为Turonian晚期—Maastrichtian期。松辽盆地嫩江组一、二段下部的钙质超微化石保存总体一般,有一定的多样性,具有海相钙质超微化石的特征。松科1井钙质超微化石的分布、古生态及其与有孔虫化石的对应关系表明,松辽盆地嫩江组一段中-下部、二段下部沉积期湖泊水域广阔,全球海平面较高,间歇性的海水侵入事件导致西北太平洋中的钙质超微浮游生物和有孔虫等海洋生物被带入松辽盆地。
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| 收稿时间： | 5/1/2015 12:00:00 AM |
Seawater incursion event in Songliao Basin: New evi-dence from calcareous nannofossils of SK-1 |
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| CAO Wenxin,XI Dangpeng,HUANG Qinghu,CHENG Yi,QU Haiying,GAO Lianfeng and WAN Xiaoqiao.Seawater incursion event in Songliao Basin: New evi-dence from calcareous nannofossils of SK-1[J].Geologcal Bulletin OF China,2016,35(6):866-871. |
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| Authors: | CAO Wenxin XI Dangpeng HUANG Qinghu CHENG Yi QU Haiying GAO Lianfeng and WAN Xiaoqiao |
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| Institution: | 1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences(Beijing), Beijing 100083, China;2. State Key Laboratory of Palaeobiology and Stratigraphy, Chinese Academy of Sciences, Nanjing 210008, Jiangsu, China;3. Exploration and Development Research Institute of Daqing Oil Field Company, Daqing 163712, Heilongjiang, China;4. College of Mining Engineering, North China University of Science and Technology, Tangshan 063009, Hebei, China |
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| Abstract: | The Songliao Basin is the largest non-marine oil-bearing basin in China. Due to the absence of sufficient evidence, the hypothesis of seawater incursion(s) into the Songliao Basin remains controversial. Marine fossil materials can provide direct explana-tions. More recently, a few calcareous nannofossils were discovered from units 1 and 2 of the Nenjiang Formation in drill hole SK-1. In these fossils, some taxa have been positively identified, namely Calculites obscurus, Calculites ovalis, Quadrum sp., and Micula sp. They were distributed in marine environment of the Cretaceous. Based on comparisons of the calcareous nannofossil assemblages from global records, the age of units 1 of the Nenjiang Formation seems to have spanned from the latest Turonian to Maastrichtian. The nannofossils from the Songliao Basin have the marine origin, characterized by common diversity and abundance. The distribu-tion and paleoecology of the calcareous nannofossils as well as the co-existing foraminifera in the SK-1 provide further evidence for seawater incursion events in the Songliao Basin. The authors hold that periodical seawater incursion(s) brought calcareous nannofossils and foraminifera into the Songliao Basin during sedimentation of units 1 and 2 of the Nenjiang Formation, when both lake and sea were at high level. |
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| Keywords: | calcareous nannofossils seawater incursion Songliao Basin SK-1 Nenjiang Formation Cretaceous |
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