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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2004  >  26(5): 484-487
XIONG Yong-qiang, ZHANG Hai-zu, GENG An-song. VARIATION OF CARBON ISOTOPIC COMPOSITION OF KEROGEN DURING THERMAL EVOLUTION[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2004, 26(5): 484-487. doi: 10.11781/sysydz200405484
Citation: XIONG Yong-qiang, ZHANG Hai-zu, GENG An-song. VARIATION OF CARBON ISOTOPIC COMPOSITION OF KEROGEN DURING THERMAL EVOLUTION[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2004, 26(5): 484-487. doi: 10.11781/sysydz200405484
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VARIATION OF CARBON ISOTOPIC COMPOSITION OF KEROGEN DURING THERMAL EVOLUTION

doi: 10.11781/sysydz200405484

  • State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China

  • Received Date: 2004-01-18
  • Rev Recd Date: 2004-07-26
  • Publish Date: 2004-09-25
    Abstract
  • Purpose of this study is to reveal the variation characteristics of kerogen during thermal evolution by determining the residual rate of kerogen and the carbon isotopic composition of residual kerogen at (different thermal) (evolution) stages, thus providing evidence of carbon isotope for quantitative identification and assessment of effective gas source rock. The result indicates that, at the early stage of methane (generation) (Ro1.5%), kerogen (obviously) enriches in 13C with the increasing of thermal evolution, up to 3.8‰. However, when Ro reaches 1.5%-2%, δ13C values of residual kerogen display a trend of slight depletion in 13C, varying within about 2‰. When the thermal maturity is higher (Ro2%), the variation of carbon isotopic composition is less than 0.8‰ for residual kerogen.

     

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