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文章通过对四川盆地震旦系—侏罗系含气层系中天然气的烃类组成、非烃组成及碳氢同位素组成资料的分析，探讨了天然气的成因类型、成熟度、运移和混合作用等。四川盆地天然气的组成特征不仅受母质类型的影响，而且受成熟度的影响。根据碳氢同位素组成，可以将四川盆地的天然气划分为侏罗系“浅层”油伴生腐泥型气、上三叠统热成因腐殖型气及中三叠统—震旦系“深层”油裂解腐泥型气等三大类型。根据分析资料推断，川西侏罗系、川东卧龙河上三叠统及石炭系的天然气为运移次生成因。三叠系嘉陵江组、二叠系和石炭系的天然气普遍具有同位素倒转现象，认为这是由于天然气混合作用的结果。
By analyzing the hydrocarbon composition, non-hydrocarbon composition and hydrocarbon isotopic composition of natural gas in the Sinian-Jurassic gas-bearing strata in the Sichuan Basin, the paper discussed the genetic types, maturity, migration and mixing of natural gas Wait. The compositional features of natural gas in the Sichuan Basin are not only affected by the type of parent material, but also affected by the degree of maturity. According to the composition of hydrocarbon isotopes, natural gas in the Sichuan Basin can be divided into Jurassic shallow oil-associated sapropelic gas, Upper Triassic thermophilic humus gas and Middle Triassic-Sinian deep layer Oil cracking sapropel gas three major types. According to the analysis, it is inferred that natural gas in Upper Jurassic, western Sichuan Wolonghe Upper Triassic and Carboniferous is the secondary cause of migration. Triassic Jialingjiang Formation, Permian and Carboniferous natural gas generally have isotope inversion phenomenon, which is considered as a result of natural gas mixing.