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四川盆地广泛分布着储层为二迭系、三迭系的天然气藏,部分地区震旦系地层中分布有工业气藏。通过对川南和川东几十个气田天然气中氩、硫、碳同位素组成特征的研究,讨论了天然气的气源对比。一、天然气中氩同位素丰度分布特征根据60个高压钢瓶采样对氩同位素 Ar~(40)/Ar~(36)此值测量结果表明,天然气中氩同位素Ar~(40)/Ar~(36)的丰度此可以作为一项地球化学指标,用以对气层进行划分和对比。Ar~(40)/Ar~(36)比值的变化,主要决定于沉积岩年代,沉积岩中含钾量及含钾矿物所产生的 Ar~(40)由岩石脱出的程度,个别情况有来自基岩和地幔气体加入,也将对 Ar~(40)/Ar~(36)比值产生不同的影响,对四川
The Sichuan Basin is widely distributed with Permian and Triassic natural gas reservoirs. In some areas, industrial gas reservoirs are distributed in the Sinian strata. By comparing the composition of argon, sulfur and carbon isotope composition of natural gas from dozens of gas fields in south Sichuan and eastern Sichuan, the gas source comparison of natural gas is discussed. First, the natural gas isotope abundance distribution of argon According to the 60 high-pressure cylinder sampling argon Ar isotopic Ar ~ (40) / Ar ~ (36) measurements of this value shows that the natural gas Ar isotope Ar ~ (40) / Ar ~ (36 ) This can be used as a geochemical indicator to divide and contrast the gas layer. The change of Ar ~ (40) / Ar ~ (36) ratio is mainly determined by the age of sedimentary rocks, the amount of potassium in sedimentary rocks and the degree of Ar ~ (40) And the addition of mantle gas will also have different effects on the Ar ~ (40) / Ar ~ (36) ratio.