千米桥东潜山天然气地球化学特征及成因探索

通过地化分析，结合地质条件等，对千米桥东潜山天然气地球化学特征进行了剖析，并对其气藏的形成进行了探索，结果认为：千米桥东潜山天然气为无机二氧化碳、偏腐殖型有机气，腐泥型有机气的复合气，主源为东部歧口凹陷沿岩带深层（偏）腐殖型气，烃类气体聚集时间晚，为更新世明化镇沉积时其，而无机二氧化碳聚集时间早于烃类气体；与千米桥凝析气藏不同的是该气藏CO2含量高。

Gas geochemical characteristics and genesis approach in east buried hill of Qianmiqiao

Through geochemical analysis, with consideration of geological conditions, this paper analyzes gas geochemical characteristics of east buried hill of Qianmiqiao, and probes gas reservoir genesis. The result is that natural gas in east buried hill of Qianmiqiao is a compound of inorganic CO-2, humic prone organic gas, and sapropelic organic gas, with deep humic prone gas in coastal belt of east Qikou depression as its source; hydrocarbon gases accumulated in Minghuazhen sedimentary period of Pleistocene, while inorganic CO-2 accumulated earlier than hydrocarbon gases; this gas reservoir has high CO-2 content, which is different from Qianmiqiao condensate gas reservoir.