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XI Bin-bin,SHI Wei-jun,JIANG Hong,QIAN Yi-xiong.Synthesis of N2-CH4 and N2-CO2 Gas Mixtures as an Online Standard and Determination of Their Raman Quantification Factors of CH4 and CO2[J].Rock and Mineral Analysis,2014,33(5):655-660
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Synthesis of N2-CH4 and N2-CO2 Gas Mixtures as an Online Standard and Determination of Their Raman Quantification Factors of CH4 and CO2
Received:December 09, 2013  Revised:July 28, 2014
DOI:
Key words: gas mixture  Laser Raman Microprobe  Raman quantification factor
Author NameAffiliation
XI Bin-bin Wuxi Research Institute of Petroleum Geology, Key Laboratory of Petroleum Accumulation MechanismsSINOPEC, Wuxi 214151, China 
SHI Wei-jun Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214151, China 
JIANG Hong Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214151, China 
QIAN Yi-xiong Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214151, China 
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Abstract:
      Organic and/or inorganic gas composition can be measured quickly and accurately by using a Laser Raman Microprobe with an online standard of gas mixtures. The accuracy of the standard sample plays an important role in this method, but the commercial standard mixed gas cylinders are expensive with fixed composition that cannot be modified arbitrarily. A new method to synthesize the gas mixtures in different compositions under different pressures has been developed. The N2-CH4 and N2-CO2 gas mixtures with varied N2 mol contents of 30%, 50% and 70% were synthesized. The pressure of these gas mixtures were increased to 5 and 10 MPa. Both the synthesized and commercial gas mixtures of 70% N2 and 30% CO2 have similar relative peak heights and peak areas of N2 and CO2. The error of this method is less than 4%. The Raman quantification factor of CH4 and CO2 are determined. In this study, the Raman quantification factor is insensitive to composition and pressure under 5 MPa and 10 MPa. This new method is relatively simple, easy and accurate, and only two or more kinds of pure gas cylinders are used to synthesize gas mixtures with different composition and under different pressure, which provides a new way for laser Raman calibration and gas composition measurement in situ.