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碳酸盐岩有别于碎屑岩的成岩机理和过程决定了其含有多种赋存状态的有机质.大量碳酸盐岩样品的有机岩石学观察和有机地球化学分析均证实了不同赋存状态有机质的存在.通过对热模拟实验样品中不同赋存状态可溶有机质的产率、地球化学特征研究及其对比,表明不同赋存状态有机质在不同演化阶段对成烃的贡献不同,由此提出了碳酸盐烃源岩的“三段式”生烃模式,即早期的生物大分子解聚生烃阶段、中期的干酪根热降解生烃阶段以及高演化阶段碳酸盐告包裹体有机质的大量生烃阶段.
The diagenetic mechanism and process of carbonate rocks, which are different from clastic rocks, determine their organic matter with multiple occurrences. The organic petrological and organic geochemical analyzes of a large number of carbonate rocks confirm that different occurrences Organic matter.According to the yield, geochemical characteristics and comparison of soluble organic matter in different existent states in the thermal simulation experiment samples, it is shown that the contribution of organic matter in different occurrence states to hydrocarbon generation is different in different evolution stages, The “three-stage” hydrocarbon generation mode of carbonate source rocks, ie, the early stage of depolymerization and hydrocarbon generation of biological macromolecules, the middle stage of thermal degradation and hydrocarbon generation of kerogen and the large amount of organic matter of carbonate inclusion in the high evolution stage Hydrocarbon phase.