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在有机质热演化成烃作用的同时,其成烃产物通过岩石吸附、成岩矿物的包裹等作用被记录在沉积岩石中,酸解烃指被成岩碳酸岩、铝硅酸盐等矿物包裹的C_1—C_5,气态烃,在样品粉碎和真空条件下,游离烃已大部分被解析,兼之酸解烃较岩石吸附烃又高出3个量级.其化学组成和同位素组成的变化则应与相应层段生成的天然气地球化学特征相一致,因此可通过源岩酸解气和天然气同位素组成的对比,追索烃源岩,这种气-源对比较前人的工作更直接一些.本文通过鄂尔多斯盆地城川一井酸解烃组成的垂向变化及古生界烃源岩酸解气和天然气碳同位素对比研究,探讨了酸解烃的来源及利用烃源岩酸解气与天然气同位素组成,进行气-
While organic matter is thermally evolved into hydrocarbon, its hydrocarbon-forming products are recorded in sedimentary rocks through rock adsorption and diagenetic mineral inclusions. Acid-induced hydrocarbon refers to the C 1 - C_5, gaseous hydrocarbons, most of the free hydrocarbons have been analyzed under the conditions of sample crushing and vacuum, and the amount of acid-hydrolyzed hydrocarbons is three orders of magnitude higher than that of rock adsorbed hydrocarbons.The chemical composition and isotopic composition change should be related to the corresponding layer Therefore, the source rocks can be traced by contrasting the source rocks and the isotopic composition of natural gas, which is more direct than the predecessor’s work.In this paper, through the analysis of the geochemical characteristics of natural gas in the Ordos Basin Vertical change of the composition of acid-dissolved hydrocarbon in a well, and the comparison of the palaeo-source hydrocarbon acid gas and natural gas carbon isotopes, the source of acid-dissolved hydrocarbon and the isotopic composition of acid gas and natural gas by source rock are discussed,