摘要
地球排气过程和费-托合成反应中碳同位素分馏作用使其具有非常大的变化范围,覆盖了目前所说的有机成因气和无机成因气,要求人们重新审视目前判别无机成因气的碳同位素指标。天然气水合物中甲烷和二氧化碳较轻碳同位素值表明,无机成因天然气可以有更宽的同位素分布范围．碳同位素不是天然气成因唯一的判别方法,利用甲烷伴生气体的组分含量、天然气运移方式、赋存特征、与构造作用的关系都可以判断天然气的无机成因．
The fractionation of carbon isotopes during the earth degassing and Fischier-Tropseh synthesis results in an extraordinary variation range of carbon isotopes concentration, covering the currently so called both organic and inorganic genetic natural gas. This requires us to review the current carbon isotope index used to identify inorganic genetic natural gas. Lower carbon isotopic concentration of methane and carbon dioxide in gas hydrate indicates that inorganic genetic natural gas may have wider isotopes distribution range. Carbon isotopic concentration is not the only way to distinguish natural gas origin. Composition of associated gas of methane, natural gas migration modes, occurrence features, and relationship with tectonism can also be used as indexes.
出处
《化工矿产地质》
CAS
2006年第4期225-233,共9页
Geology of Chemical Minerals
关键词
甲烷
二氧化碳
天然气水合物
同位素
判别指标
methane, carbon dioxide, gas hydrate, isotopes, identification index
