THE RESEARCH OF THE ORIGIN OF CARBON DIOXIDE IN ASSOCIATED GAS OF DQAING PLACANTICLINE
Received date: 2005-11-10
Revised date: 2005-12-30
Online published: 2006-02-20
The content of CO2 in associated gas of Daqing placanticline has increased greatly after the 90s of 20th century.The CO2 content of the whole amount of associated gas reached 2.87%(V/V)in 2003,the content of CO2 today is about ten times higher than that of in 80s of last century and it’s increasing trend is obvious.By analysing δ13CCO2 of the CO2 in associated gas,the values of three samples are all higher than +3‰.The figure indicates that the origin of this CO2 is the pyrolysis of carbonate.The origin of this CO2 perha ps associate with the pyrolysis of carbonate rock in Permo-Carboniferous.
Key words: Daqing placanticline; Associated gas; Carbon isotope; Origin; Metamorphism.
GUO Zhan-qian; WANG Lian-sheng;LIU Li; MA Zhi-hong;CHI Dong-hui . THE RESEARCH OF THE ORIGIN OF CARBON DIOXIDE IN ASSOCIATED GAS OF DQAING PLACANTICLINE[J]. Natural Gas Geoscience, 2006 , 17(1) : 48 -50 . DOI: 10.11764/j.issn.1672-1926.2006.01.48
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