【摘要】 由于生物化学作用、热降解作用和构造活动等的共同影响,不同成因天然气易在含油气盆地浅层聚集在同一气藏内形成浅层混源天然气藏。论述了浅层原生天然气(生物成因气和低温热成因气)及浅层次生天然气(次生运移天然气和微生物改造天然气)的组分组成及碳同位素组成的分布特征,讨论了影响浅层混源天然气碳同位素组成的主要因素,分析了浅层混源天然气判识的地球化学指标。更多还原

【Abstract】 Because of the co\|effects of the bio\|chemical degradation, the thermal degradation and the tectonic activity, natural gases of various origins tend to accumulate in one shallow reservoir and form mix\|sourced shallow gas reservoirs in the oil and gas\|bearing basins. In this paper, the component and carbon isotopic distribution characteristics of the original shallow gases (i.e., biogenic gas and low\|temperature thermolgenic gas) and the secondary originated shallow gases (i.e., secondary migrated gas and bio\|degraded gas) have been expounded, the main factors which affect the carbon isotopic compositions of the mix\|sourced shallow reservoir gases have been discussed, and the geochemical indicators for the differentiation of natural gases in the mix\|sourced shallow gas reservoirs have been analyzed.更多还原