含油气盆地油气同位素地球化学研究概述

以气体地球化学国家重点实验室工作为主，简要概述了对我国含油气的同位素地球化学研究。1．烃气的同位素地球化学：讨论了天然气成因新模式与气藏烃气同位素组成的关系，低演化阶段天然气同位素分馏的二阶段模式，云南中小盆地天然气低演化系列同位素特征及用储层解析气作油气源对比。2．稀有气体同位素地球化学：阐述了^3He/^4He值与中国构造分区，幔源氮的复合成藏和幔源甲烷问题以及气源对比等。3．液态烃同位素地球化学：简述了轻烃碳氢同位素特征及氢同位素作为判别古沉积介质盐度的指标，概述了未熟一低熟油同位素特征及在自然剖面上油和源油抽提物碳同位素分馏特征及其机理。

A Review of Isotope Geochemical Researches on Oil and Gas in Oil and Gas Bearing Basins

Based mainly on the research results of the State Key Laboratory of Gas Geochemistry, a brief review was given out on the isotope geochemical researches of oil and gas bearing basins in China. 1. Isotope geochemistry of hydrocarbon gases :Discussed the relationship between new genetic model of natural gases and isotopic compositions of hydrocarbon gases in the gas reservoirs, the two stage model of isotopic fractionation of natural gases in the low mature stage, the isotopic characteristics of natural gases of low mature series in the medium and small basins in the Yunnan province and the oil (gas) source rock correlations by using resolved gases from reservoir strata. 2. Isotope geochemistry of noble gases :Expounded the relations of 3 He/ 4He ratio and the classification of tectonic regions in China, the composite storage of mantle helium, the controversy of mantle methane and the gas source rock correlation. 3. Isotope geochemistry of liquid hydrocarbons:Expounded carbon and hydrogen isotopic characteristics of light hydrocarbons, hydrogen isotope as an index for distinguishing the salinity of paleodepositional medium, the isotopic characteristics of immature and low mature oils and the characteristics and mechanisms of carbon isotopic fractionations of oil and source rock exstracts in the natural sections.