热演化过程中干酪根碳同位素组成的变化

熊永强; 张海祖; 耿安松

doi:10.11781/sysydz200405484

热演化过程中干酪根碳同位素组成的变化

doi: 10.11781/sysydz200405484

中国科学院, 广州地球化学研究所, 有机地球化学国家重点实验室, 广东, 广州, 510640

基金项目: 国家"十五"科技攻关项目(2001BA605A-04-04);中国科学院知识创新工程重大项目(KCZX1-SW-18-03).

详细信息

作者简介:
熊永强(1967- ),男(汉族),江西南昌人,研究员,主要从事油气地球化学研究.

中图分类号: TE135
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出版历程
- 收稿日期: 2004-01-18
- 修回日期: 2004-07-26
- 刊出日期: 2004-09-25

VARIATION OF CARBON ISOTOPIC COMPOSITION OF KEROGEN DURING THERMAL EVOLUTION

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

摘要

摘要: 通过测定一个Ⅰ型干酪根在不同热演化阶段的残余率和残余部分的碳同位素组成,揭示其在热演化过程中的变化规律,从而为有效气源岩的定量判识与评价提供同位素方面的依据。研究表明,在产甲烷早期(R_o<1.5%),干酪根的碳同位素组成变化较明显,可达3.8‰;当R_o达到1.5%～2%时,随着热演化程度的增加,残余干酪根的δ¹³C略微呈现出逐渐贫¹³C的趋势,变化幅度约为2‰;当热演化程度较高(R_o>2%)时,干酪根的碳同位素组成则变化不大,变化幅度小于0.8‰。
- 甲烷生成率 /
- 碳同位素组成 /
- Ⅰ型干酪根
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) (R_o1.5%), kerogen (obviously) enriches in ¹³C with the increasing of thermal evolution, up to 3.8‰. However, when R_o 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 (R_o2%), the variation of carbon isotopic composition is less than 0.8‰ for residual kerogen.
- methane generating yield /
- carbon isotopic composition /
- type Ι kerogen

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参考文献(10)

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