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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。
Organic-inorganic interactions are ubiquitous in the formation of evolution-rich reservoirs (mines) of various energy and mineral resources of oil, gas, coal and uranium. The strong adsorption of organic matter and the reduction environment provided by it are rich in uranium While integrated mineral plays a catalytic role, uranium also changes the process of hydrocarbon generation and evolution of source rocks. In this paper, the hydrocarbon generation simulation experiment was carried out under the condition of uranyl carbonate solution added to Ⅱ type low maturization source rock, and the relative parameters of the hydrocarbon generation simulation experiment without uranium-plus-uranium sample were compared to explore the relationship between the inorganic uranium Play a role. It can be seen from the experimental results that uranium can convert the unsaturated hydrocarbons in the product to saturated hydrocarbons, accelerate the cracking of long-chain hydrocarbons and promote the production of low-molecular hydrocarbons, so as to increase the content of CH4 and make the produced dry gas Degree of increase. Uranium can promote the maturity of organic matter in the low temperature stage, lower the hydrocarbon generation threshold of source rocks, and make hydrocarbon generation in early maturity source rocks. At the same time, it can prevent the organic matter from over-maturing during the high temperature, which is beneficial to the preservation of generated hydrocarbons. Thus uranium may be one of the possible inorganic promoters of immature-low-maturity oil and gas generation.