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Natural Gas Geoscience ›› 2003, Vol. 14 ›› Issue (2): 92-96.doi: 10.11764/j.issn.1672-1926.2003.02.92

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MATHEMATIC MODELS OF STABLE CARBON IS OTOPE COMPOSITION OFCOAL-DERIVED METHANE AND THEIR APPLICATIONS

ZOU Yan-Rong, SHUAI Yan-hua, KONG Feng, PENG Ping-an   

  1. （The State Key Laboratory of Organic Geochemistry, Guangzhou Institu te of Geochemistry,Chinese Academy of Sciences, Guangzhou 510640, China）
  • Received:2003-02-12 Revised:2003-03-20 Online:2003-04-20 Published:2003-04-20

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Abstract:

 In this paper different mathematic models are discussed, including the relations hip models connected the stable carbon isotope composition with source rock matu ration, distillation models based on Rayleigh expression and kinetic models, and  a relationship diagram between instantaneous and accumulation carbon isotope co mposition linked to source bed maturity is proposed on the basis of other resear chers, which can be used to roughly estimate the accumulation/loss history of co al-derived gas pool. Applicable extents of different models are illustrated. The  gas accumulation/loss history of Kela 2 gas pool in the Kuqua depression of Tar im Basin, the biggest gas field of China, is restructured as an example by using  isotope kinetic model and others. The results suggest that the natural gas of K ela 2 pool, with the carbon isotopic value of -27.78‰~-27.73‰, cumulated fro m early stage of gas generation to about 2.0 Ma, which was hardly lost during th e source rock maturation and gas generation because of coalbeds with strong abso rbability. However, the late generated gas was not filled into this pool due to  the overpressure development starting at about 2.0 Ma, which is supported by non -hydrocarbon components in this gas pool.

Key words: Coal, derived gas, Stable carbon isotope composition, Relationship model, Distillation model, Kinetic model.

CLC Number: 

  • TE122.1+13

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