摘要
为了探讨扩散引起的天然气组分及其碳同位素的分馏效应与岩石物性之间的关系,建立了相应的扩散分馏作用地质模式。通过自行设计的天然气成藏物理模拟仪,选择了不同物性的岩芯及其组合进行了天然气组分及其碳同位素扩散分馏作用模拟实验。实验研究结果表明:岩石的孔隙度和渗透率越低,扩散运移引起的分馏效应越明显;乙烷以上的重烃碳同位素几乎不发生分馏作用,但其组分组成仍存在一定程度的分馏现象。利用天然气组分及其碳同位素的上述变化规律,可以追踪天然气的运移路径,也可用于气源对比研究。
Based on the equipment designed and developed by ourself, the experiment has been conducted to investigate on the carbon isotope fractionation of methane during gas migration by diffusion through sedimentary rocks with different chacracteristics. The study indicated, the lower the porosity and the permeability,the higher the fractionation. As for C\-\{2\++\}, no measurable fractionation was observed while the composition fractionation somewhat exsited. It is very significant not only for investigation on the path of gas migration but also for research of gas\|correlation.
出处
《天然气地球科学》
EI
CAS
CSCD
2003年第6期463-468,共6页
Natural Gas Geoscience
基金
国家重点基础研究发展规划项目(编号:2001CB20913)资助.
关键词
天然气
组分
碳同位素
扩散
分馏
模拟实验
Natural gas
Carbon isotope
Diffusion
Fractionation
Simulation.
