Based on analysing the chemical composition and carbon isotopes of natural gases,mult-genetic gases have been founded in Changde gas field,such as organic gases and inorganic gases.

• 通过对昌德气田中天然气的化学组分和碳同位素的分析发现，该区天然气的成因类型很复杂，既有有机成因天然气，又有无机成因天然气。