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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。昌德气藏和昌德东气藏中的天然气成因有一定的差别。昌德气藏中天然气重烃含量相对较低 ,出现重碳同位素和负碳同位素系列 ,可能有无机烃类气体的混入。昌德东气藏除有机成因的煤型气外 ,还发现有幔源成因的高纯二氧化碳气藏。非烃气体在纵向上的分布以登娄库组以下地层的营城组火山岩系地层含量最高。在平面上高含量非烃气体的分布常与深大断裂的走向一致 ,主要为无机成因
By analyzing the chemical composition and carbon isotope of natural gas in Changde gas field, it is found that the genetic type of natural gas in this area is very complicated, including both organic gas and inorganic gas. The causes of natural gas in Chand and Chand East gas reservoirs are different. In Changde gas reservoir, the heavy hydrocarbon content of natural gas is relatively low with heavy carbon isotopes and negative carbon isotopes series, and inorganic hydrocarbon gas may be mixed in. In addition to organic coal gas, Chandhon East gas reservoir also found a high-purity carbon dioxide gas reservoir with mantle origin. Longitudinal distribution of non-hydrocarbon gas in Denglouku group below Yingcheng Formation volcanic rock strata is highest. The distribution of high-content non-hydrocarbon gases in the plane is often consistent with that of deep faults, mainly because of inorganic origin