Abstract

Changes in the elemental composition of asphaltenes in organic matter (OM) of different origin, with particular focus on their evolution from proto- to mesocatagenesis, were analyzed in samples of Devonian bituminous shales and brown coals from the Kuznetsk Basin and samples of Cenozoic brown coals and clays from the Middle Amur Basin. The composition of asphaltenes (protoasphaltenes) of different origin is shown to be differentiated as early as the stage of sedimentation: terrestrial asphaltenes are enriched in carbon and hydrogen, while sapropelic asphaltenes contain more oxygen (heteroelements). It is discovered that the formation of the two evolutionary catagenetic branches of asphaltene compositions corresponds to the onset of protocatagenesis. Both sapropelic and terrestrial OM undergo different transformations during diagenesis (at the sediment–protocatagenesis interface), with sapropelic OM subjected mainly to drastic carbonation with parallel hydrogenation, while redistribution of oxygen and hydrogen concentrations associated with a dramatic loss of the latter observed in the terrestrial OM (if the of carbon concentration level is constant). Further changes in the composition of asphaltenes within these branches take place during the mesocatagenesis through apocatagenesis, during which the evolutionary branches converge again.

中文翻译：

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低热成熟度有机质中沥青质的地球化学

摘要

在库兹涅茨克盆地泥盆系沥青页岩和褐煤样品以及新生代褐煤样品中分析了不同来源的有机质（OM）中沥青质元素组成的变化，特别是从原催化到中催化的演化。和阿穆尔中部盆地的粘土。显示出不同来源的沥青质（原沥青质）的组成早在沉积阶段就已被区分：陆地沥青质富含碳和氢，而腐泥质沥青质包含更多的氧（杂元素）。发现沥青质组合物的两个进化催化分支的形成对应于原催化的开始。在成岩过程中（沉积物-原催化作用的界面），腐泥土和陆地OM都经历了不同的转变，腐泥土OM主要经历了剧烈的碳酸化作用，同时发生了平行氢化作用，而氧气和氢气的重新分布与在陆地上观测到的氧和氢的浓度急剧下降有关。 OM（如果碳浓度水平恒定）。这些支链中的沥青质组成的进一步变化发生在中生催化到脱辅催化的过程中，在此期间进化分支再次收敛。而氧气和氢气浓度的重新分配与在地面OM中观察到的后者的急剧损失有关（如果碳浓度水平恒定）。这些支链中的沥青质组成的进一步变化发生在中生催化到脱辅催化的过程中，在此期间进化分支再次收敛。而氧气和氢气浓度的重新分配与在地面OM中观察到的后者的急剧损失有关（如果碳浓度水平恒定）。这些支链中的沥青质组成的进一步变化发生在中生催化到脱辅催化的过程中，在此期间进化分支再次收敛。