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Sulphur-radical control on petroleum formation rates

机译:硫自由基对石油形成速率的控制

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摘要

Most petroleum is formed through the partial decomposition of kerogen (an insoluble sedimentary organic material) in response to thermal stress during subsurface burial in a sedimentary basin. Knowing the mechanisms and kinetics of this process allows the determination of the extent and timing of petroleum formation, which, in turn, are critical for evaluating the potential for petroleum occurrences within a sedimentary basin. Kinetic models of petroleum generation are derived mainly from pyro-lysis experiments, in which it is usually assumed that formation rates are controlled by the strength of the bonds within the precursor compounds: this agrees with the observation that petroleum formation rates increase with increasing sulphur content of thermally immature kerogen, C-S bonds being weaker than C-C bonds. However, this explanation fails to account for the overall composition of petroleum. Here I argue, on the basis of pyrolysis experiments, that it is the presence of sulphur radicals, rather than the relative weakness of C-S bonds, that controls petroleum formation rates. My findings suggest that the rate of petroleum formation depends critically on the concentration of sulphur radicals generated during the initial stages of thermal maturation. The proposed mechanism appears to provide a realistic explanation for both the overall composition of petroleum and the observed variation in formation rates.
机译:大部分石油是由干酪根(一种不溶性沉积有机物质)的一部分分解而形成的,该干酪根是响应沉积盆地地下埋藏期间的热应力而形成的。知道该过程的机理和动力学,就可以确定石油形成的程度和时间,这反过来对于评估沉积盆地中发生石油的可能性至关重要。石油生成的动力学模型主要来自热解实验,在该实验中,通常假定形成速率受前体化合物内键的强度控制:这与以下观察结果一致:石油形成速率随硫含量的增加而增加热未成熟的干酪根,CS键比CC键弱。但是,这种解释未能说明石油的总体组成。在此,根据热解实验,我认为控制石油形成速率的是硫自由基的存在,而不是C-S键的相对弱势。我的发现表明,石油形成的速率主要取决于热成熟初期产生的硫自由基的浓度。所提出的机制似乎为石油的总体组成和所观察到的地层速率变化提供了现实的解释。

著录项

  • 来源
    《Nature》 |1998年第6663期|p.164-166|共3页
  • 作者

    Michael D. Lewan;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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