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- W2356224354 abstract "The isotopically heavier carbon for CO2 in the associated gases from the Daqing Placanticline is observed in China, and the δ13CCO2 values rang from +3.65‰ to +11.81‰, more positive than those from thermal decomposition of carbonate with δ13CCO2= 0±3‰. According to the identification of the carbon isotopic composition of CO2 and symbiotic CH4 in the associated gas and shallow gases in the Songliao basin, the heavier δ13CCO2 is caused by bacteria reduction. Meanwhile, based on numerical modeling, the δ13CCO2 value changes fast for residual gas from the higher fractionation than from the lower during the bacteria reduction from CO2 to CH4. If the reduced CO2 has the similar δ13C values to the present gas, the proportions of the reduced CO2 from the thermal degradation of organic matter and carbonate decomposition are up to 40% and 6%, respectively. Obvious change of gas composition in the associated gas in the Daqing Placanticline would happen if the CO2 compound were derived from organic matter. Therefore, the thermal decomposition of carbonate is the main source of CO2 in the associated gas of the Daqing Placanticline." @default.
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- W2356224354 date "2008-01-01" @default.
- W2356224354 modified "2023-09-28" @default.
- W2356224354 title "Discussion about the CO_2 Origin in Associated Gas from Daqing Placanticline,Songliao Basin" @default.
- W2356224354 hasPublicationYear "2008" @default.
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