北京大学学报(自然科学版)

四川西部沉积物中饱和烃单体烃碳同位素研究及其环境意义

王玉斌1,关平1,刘文汇2   

  1. 1北京大学地球与空间科学学院,北京,100871,E-mail: pguanl@pku.edu.cn;2中石化石油勘探开发研究院,北京,100083
  • 收稿日期:2004-04-06 出版日期:2005-07-20 发布日期:2005-07-20

Single Molecule Carbon Isotope of n-Alkane from Sediments and Its Application to Environments, Western Sichuan

WANG Yubin1, GUAN Ping1, LIU Wenhui2   

  1. 1School of Earth and Space Sciences, Peking University, Beijing, 100871, E-mail: pguanl@pku.edu.cn; 2Exploration and Production Research Institute, SINOPEC, Beijing, 100083
  • Received:2004-04-06 Online:2005-07-20 Published:2005-07-20

摘要: 通过对四川盆地西部湖泊沉积物样品的单体烃碳同位素值的分析,发现短链烷烃的单体烃碳同位素值与海拔有一个较好的关系:海拔升高,短链烷烃的单体烃碳同位素值升高。通过对数据的分析,认为这种关系是由于大气中二氧化碳分压、温度、降水量等几个环境因素协同作用的结果。另一方面,检验了过去人们对于长链烷烃的认识,随着海拔的升高,长链烷烃单体烃碳同位素值变小。这两方面的对比可以更好地预测海拔变化和环境变化。

关键词: 短链烷烃, 长链烷烃, 单体烃碳同位素, 海拔, 环境

Abstract: The data of n-alkane of lacustrine sediments in west of Sichuan prove the connection between the value of δ(13C) of C17-C22 n-alkane and the altitudes. The δ(13C) values of C17-C22 n-alkane increase along with the elevated altitude. According to the δ(13C) data, The relationship results from three key associated factors: partial pressure mospheric carbon dioxide p(CO2), temperature and precipitation. The results also support the opinion that the δ(13C) value of C26-C33 n-alkane decrease along with the elevated altitude. Thus, comparing two aspects (n-alkane of longer and shorter train) mentioned above, it could be better to estimate the change of the altitude and the environment during the past time.

Key words: shorter train n-alkane, longer train n-alkane, single molecule carbon isotope, altitude, environment

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