All Title Author
Keywords Abstract

环境科学  2006 

On-line Method for Measurement of the Carbon Isotope Ratio of Atmospheric Methane and Its Application to Atmosphere of Yakela Condensed Gas Field
大气甲烷碳同位素测试方法及其在雅克拉凝析气田上方大气中的应用

Keywords: atmospheric methane,on-line method for measurement of the(13C)/(12C) ratio of methane,Yakela condensed field,identification of source
大气甲烷
,稳定碳同位素在线分析,雅克拉凝析气田,源示踪

Full-Text   Cite this paper   Add to My Lib

Abstract:

An on-line method for measurement of the 13C/12C ratio of methane by a gas chromatography/high-temperature conversion/ isotope ratio mass spectrometry (GC/C/MS) technique was developed. This method is less laborious, more rapid (45 min), of high precision (+/- 0.4 x 10(-3)) and by using a small amount of sample (about 200 mL of atmosphere). Its application to isotopic characterization, and hence methane source identification, was demonstrated by examination of atmosphere sample collected in Yakela condensed gas field, China. The average 13C/12C ratio of atmospheric methane in Yakela field was -45.0 x 10(-3) heavier by 1.2 x 10(-3) -2.0 x 10(-3) than the global average. This is caused by seepage and diffusing of methane from Yakela condensed gas reservoir. The concentrations of atmospheric methane in daytimes are found to be lower than those in nighttimes, and the corresponding 13C/12C ratios in daytimes are lighter compared to those in nighttimes, a phenomena probably caused by the fact that a small part of methane from Yakela condensate reservoir is consumed in soil's surface under sunlight.

Full-Text

comments powered by Disqus

Contact Us

service@oalib.com

QQ:3279437679

微信:OALib Journal