天然气地球科学 ›› 2010, Vol. 21 ›› Issue (1): 139–143.doi: 10.11764/j.issn.1672-1926.2010.01.139

• 天然气地球化学 • 上一篇    下一篇

含水饱和度对灰岩热解生成CO2气产率和碳同位素的影响

杨立国, 田辉, 申家贵, 肖贤明, 黄保家   

  1. 1.中国科学院广州地球化学研究所,有机地球化学国家重点实验室,广东 广州 510640;
    2.中国科学院研究生院,北京 100049;
    3.中海石油(中国)湛江分公司,广东 湛江 524057
  • 收稿日期:2009-07-10 修回日期:2009-08-29 出版日期:2010-02-10 发布日期:2010-02-10
  • 通讯作者: 杨立国shenxianylg@sina.com. E-mail:shenxianylg@sina.com.
  • 作者简介:杨立国(1980-),男,河北迁安人,硕士研究生,从事油气地球化学研究.
  • 基金资助:

    中国科学院知识创新工程(编号:KZCX2-YW-Q05-03-|01);中国科学院有机地球化学国家重点实验室专项(编号:SKLOG2008A01)联合资助

Influence of Water Saturation on Generation of CO2 and Its Carbon Isotope Fractionation from Limestone Pyrolysis

 YANG  Li-Guo, TIAN  Hui, SHEN  Jia-Gui, XIAO  Xian-Ming, HUANG  Bao-Jia   

  1. 1. State Key Laboratory of Organic Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China;2. Graduate School of Chinese  Academy of Sciences,Beijing 100049,China;3.CNOOC Ltd.,Zhanjiang 524057,China
  • Received:2009-07-10 Revised:2009-08-29 Online:2010-02-10 Published:2010-02-10

摘要:

以琼东南盆地的前第三系1块基底灰岩样品为替代样品,应用热模拟实验方法,进行了一系列不同含水条件下的热解实验,并对实验产物CO2的产率和碳同位素进行了分析,探讨了莺歌海盆地基底灰岩的生气情况。结果表明,水的存在与否、含水量的多少均对灰岩热解生成CO2有重大影响。水可以促进灰岩热解生成CO2气体,并能够极大地降低灰岩的热解温度。与无水条件相比,含水条件下灰岩热解产物CO2的碳同位素明显变轻。通过与前人钙质泥岩热解实验对比,并结合莺歌海盆地实际地质资料,研究认为莺歌海盆地CO2气藏可能主要来源于中新统海相钙质泥岩,而前第三系基底灰岩的贡献很少。

关键词: 莺歌海盆地, 灰岩, 含水热解, <, sub>

Abstract:

A pre -Tertiary limestone sampled from the Qiongdongnan basin,South China Sea,was pyrolyzed under conditions of different water saturations to compare their differences in carbon dioxide generation and carbon isotope fractionation. The result shows that the presence of water and its amount significantly affect the generation of thermogenic carbon dioxide. Water not only improves carbon dioxide formation,but also reduces the temperature of limestone decomposition. With comparison of no water in pyrolysis,water causes the isotopically lighter carbon of CO2 from limestone decomposition. Combined with the previous pyrolysis results of calcareous shales and the geological and geochemical data of Yinggehai basin,these suggest that the inorganic carbon dioxide would mainly originate from the lower Miocene calcareous shales and the contribution of pre -Tertiary limestone was less important.

Key words: Yinggehai basin, Limestone, Pyrolysis water, Carbon dioxide.

中图分类号: 

  • TE122.2

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