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Experimental simulation study on the influence of diagenetic water medium on sedimentary n-alkanes and their respective hydrogen isotopes

机译：成岩水介质对沉积正构烷烃及其氢同位素影响的实验模拟研究

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摘要

In order to understand the influence of the diagenetic water medium on the hydrogen isotope of sedimentary n-alkanes, thermal simulation experiments were carried out involving the initial peat under the addition of alkaline saltwater, acidic freshwater and peat alone condition. The generated n-alkanes were analyzed in terms of molecule composition and hydrogen isotopic composition of individual n-alkanes. The results show that the addition of water had a significant effect on n-alkane nC(21)(-)C(22)(+) ratio, ACL value and Pr/Ph ratio. The n-alkanes display significant heavier hydrogen isotopic composition from the alkaline saltwater added experiments, but obvious lighter hydrogen isotopic composition from the acidic freshwater added experiments. The difference of the average delta D value of n-alkanes between the saltwater and freshwater experiments ranged from 6 parts per thousand to 73 parts per thousand, and maximum difference occurred from the experiments of 350 degrees C. The exchange of inorganic hydrogen in water and organic hydrogen was more intensive in the acidic freshwater experiments than that in the alkaline saltwater experiments. The average dD value of n-alkanes generated under the participation of saltwater and freshwater media appear to be higher heavier along with the increase in experimental temperature. Also, the average dD value of n-alkanes generated from the saltwater added experiments was always higher than that from the freshwater added experiments. The correlations among the dD composition of n-alkanes generated under different condition were established. These results provide information to understand of the genesis of sedimentary n-alkanes formed under the participation of diverse diagenetic water media at various stages of maturity.
机译：为了了解成岩水介质对沉积正构烷烃氢同位素的影响，在添加碱性盐水，酸性淡水和单独使用泥炭的条件下，进行了涉及初始泥炭的热模拟实验。根据单个正构烷烃的分子组成和氢同位素组成分析了生成的正构烷烃。结果表明，添加水对正构烷烃nC（21）（-）/ nC（22）（+）比率，ACL值和Pr / Ph比率具有显着影响。从添加碱性盐水的实验中，正构烷烃显示出明显更重的氢同位素组成，而从添加酸性淡水的实验中，显示出明显更轻的氢同位素组成。盐水实验和淡水实验之间正构烷烃的平均δD值差异介于千分之六至73千分之三，最大差异发生于350摄氏度的实验中。在酸性淡水实验中，有机氢比在碱性盐水实验中的氢强度更高。随着实验温度的升高，在盐水和淡水介质的参与下生成的正构烷烃的平均dD值似乎更高。而且，从添加盐水实验中产生的正构烷烃的平均dD值始终高于从添加淡水实验中获得的正构烷烃的平均dD值。建立了在不同条件下生成的正构烷烃的dD组成之间的相关性。这些结果提供了信息，以了解在不同成熟阶段的各种成岩水介质参与下形成的沉积正构烷烃的成因。

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  • 来源
    《Fuel》 |2020年第jul15期|117704.1-117704.8|共8页
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  • 作者单位

    Chinese Acad Sci Northwest Inst Ecoenvironm & Resources Lanzhou 730000 Peoples R China|Gansu Prov Key Lab Petr Resources Lanzhou 730000 Peoples R China|Changan Univ Sch Earth Sci & Resources Xian 710054 Peoples R China;

    Shaanxi Ctr Mineral Geol Survey Xian 710068 Peoples R China;

    Chinese Acad Sci Northwest Inst Ecoenvironm & Resources Lanzhou 730000 Peoples R China|Gansu Prov Key Lab Petr Resources Lanzhou 730000 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Herbaceous peat; Hydrous and anhydrous pyrolysis; n-Alkane hydrogen isotope; Isotope exchange; Diagenesis;

    机译：草本泥炭;含水和无水热解;正构烷烃氢同位素;同位素交换;成岩作用;

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