铀对(Ⅱ型)低熟烃源岩生烃演化的影响Ⅱ
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国家重点基础研究发展计划(973计划),国家自然科学基金项目(面上项目,重点项目,重大项目)


Effects of uranium on the hydrocarbon generation of source rocks containing kerogen type Ⅱ
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    摘要:

    在油、气、煤、铀多种能源矿产形成演化富集成藏(矿)过程中,有机-无机相互作用是普遍存在的,在有机质的强大吸附作用及其所提供的还原环境为铀的富集成矿起促进作用的同时,铀也改变了烃源岩的生烃演化进程。本文在Ⅱ型低熟烃源岩中加入碳酸铀酰溶液的条件下进行了生烃模拟实验,对比无铀-加铀样品生烃模拟实验产物的相关参数,以探讨油气生成过程中无机铀所起的作用。从实验结果可以看出,铀可以使产物中不饱和烃向饱和烃转化;促进长链烃的裂解,促进低分子量烃类的产生,从而使CH4的含量提高,使生成的烃类的干气化程度增加。铀可以在低温阶段促进有机质的成熟度,降低烃源岩的生烃门限,使低熟烃源岩早期生成烃类;同时在高温阶段阻止有机质过度成熟,利于所生成烃的保存。因而铀可能是未熟-低熟油气生成可能的无机促进因素之一。

    Abstract:

    Organic-inorganic interaction is ubiquitous in the process of formation, evolution, concentration and accumulation of multi-energy resources of oil, gas, coal and uranium. Uranium also alter the process of hydrocarbon generation and evolution of hydrocarbon source rocks while that organic matter accelerate concentration and mineralization of uranium by the strong adsorption and reduction environment from the organic matter. Hydrocarbon- generating simulation experiment is proceeded using hydrocarbon source rock containing kerogen type Ⅱ with uranium (UO2CO3 solution) added to study the effects of uranium on the hydrocarbon generation of hydrocarbon source rocks by comparative study of relevant parameters of experiment products. Experiment results show that uranium can facilitate unsaturated hydrocarbons changing to saturated hydrocarbons, promoting the breaking of long-chain hydrocarbons, the low molecular weight hydrocarbons generating, as a result the content of CH4 increased, the degree of dry gas increased. Uranium can promote the maturity of organic matters, reduce the hydrocarbon generation threshold values and advance the generation of the hydrocarbons of immature hydrocarbon source rocks at low temperature, while delay the over mature of organic matter that benefit to the preservation of hydrocarbons at high temperature. It means that uranium in hydrocarbon source rocks is maybe one of the inorganic accelerating factors of the hydrocarbon generation.

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毛光周,刘池洋,张东东,邱欣卫,王建强,刘宝泉,刘静江,曲少东,张参,邓煜,王飞飞.2012.铀对(Ⅱ型)低熟烃源岩生烃演化的影响Ⅱ[J].地质学报,86(11):1833-1840.
MAO Guangzhou, LIU Chiyang, LIU Baoquan, ZHANG Dongdong, QIU Xinwei, WANG Jianqiang, LIU Jingjiang, QU Shaodong, ZHANG Can, DENG Yu, WANG Feifei.2012. Effects of uranium on the hydrocarbon generation of source rocks containing kerogen type Ⅱ[J]. Acta Geologica Sinica,86(11):1833-1840.

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  • 收稿日期:2012-03-26
  • 最后修改日期:2012-09-16
  • 录用日期:2012-09-25
  • 在线发布日期: 2012-11-13
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