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本文通过对天然气类型指标(天然气和原油、源岩的碳同位素系列、甲烷碳同位素、氢同位素和汞含量)、成熟度指标(正异构体比值)和年代指标(氩同位素)的讨论,认为塔里木盆地沙参2井天然气是来自海相源岩腐泥型母质的油型气,气源层为成熟度较高的石炭-二叠系。通过原油与油气源岩地化资料的研究,以及油田水与浓缩海水对比,结论与天然气资料一致,因而油气可能是同源的。从石油地质条件分析,海相古生界作为油气源层是有条件的,石炭-二叠系可能性最大。
Based on the discussion of natural gas type indicators (carbon isotope series of natural gas and crude oil, source rock, methane carbon isotope, hydrogen isotope and mercury content), maturity index (normal isomer ratio) and age indicator (argon isotope) Gas in Tarim 2 well of Tarim Basin is oil-gas of sapropelic parent material from marine source rock, and gas source is Carboniferous-Permian with high maturity. Through the study of the geochemical data of crude oil and oil source rocks and the comparison between oilfield water and concentrated seawater, the conclusion is consistent with that of natural gas, so the hydrocarbons may be homologous. From the analysis of petroleum geological conditions, the marine Paleozoic as a hydrocarbon source is conditional, and the Carboniferous-Permian is the most likely.