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天然气组分、同位素的分馏伴随其生成、运移及保存的整个过程,生成过程中组分、同位素分馏效应由反应基团活化能的差异引起,表现为随成熟度升高,产物同位素组成逐渐接近母质;天然气运移过程中的分馏机制与运移方式有关,以溶解相、游离相和扩散相运移的天然气,其组分、同位素分馏分别由组分或同组分不同同位素分子的溶解、吸附及扩散能力差异引起,均可用动力学理论进行解释;除扩散作用外,微生物降解是天然气藏内天然气组分、同位素分馏的重要机制,其过程受微生物种类及动力学过程控制。在此基础上,对国内外天然气运移、保存分馏实例进行了分析。
The fractionation of natural gas components and isotopes is accompanied by the formation, migration and preservation of components. The components in the process of formation and the isotopic fractionation effect are caused by the differences in the activation energy of the reactive groups. The isotope composition is gradually increased with increasing maturity Close to the parent material. The mechanism of fractionation in natural gas migration is related to the migration mode. The natural gas transported by the dissolved phase, the free phase and the diffusive phase is fractionated by the dissolution of the components or different isotopes of the same component , Adsorption and diffusion ability caused by the difference, can be used to explain the kinetic theory; in addition to diffusion, microbial degradation of natural gas components in gas reservoirs, isotope fractionation is an important mechanism, the process is controlled by the species and dynamics of microorganisms. On this basis, the examples of natural gas migration and storage at home and abroad are analyzed.