摘要
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。
Hydrocarbon component and isotope composition would be fractioned during the generation,immigration and conservation of natural gas.During the generation of natural gas,the fractionation effect is caused by the activating energy difference of base groups which could break off from parent materials and translate into hydrocarbon gas.At low maturity stage,base groups with low activating energy could break off and translate into hydrocarbon gases with light isotopic.At high maturity stage,base groups with high activating energy translated into hydrocarbon gases with weight isotopic similar to parent material.During the immigration of natural gas,the fractionation effect is caused by the differences of dissolution,adsorption and diffusion abilities among different components or same component with different isotopic molecules,corresponding to dissolving,dissociating and diffusing immigration models respectively.Microbial degradation is an important fractionation cause of natural gas in gas reservoirs.Microbial degradation process is controlled by the microbial types and kinetics mechanism.Samples of gas reservoirs with the fractionation effects of natural gas during immigration and conservation are given.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2011年第2期195-200,共6页
Natural Gas Geoscience
基金
中国博士后科学基金(编号:20090451345)
国家重点基础研究发展规划项目(编号:2001CB209102)联合资助
关键词
天然气组分
同位素组成
分馏机理
实例分析
Natural gas component
Isotopic compositions
Fractionation mechanism
Sample analysis.
