库车坳陷克拉苏构造带超高压大气田天然气地球化学特征  

Geochemical Characteristics of Natural Gas in Overpressured Large Gas Field of Kelasu Tectonic Belt in Kuqa Depression

作　　者：冯松宝[1] 汪宏志[2] 

机构地区：[1]宿州学院地球科学与工程学院,安徽宿州234000 [2]安徽煤田地质局第三勘探队,安徽宿州234000

出　　处：《天然气地球科学》2013年第4期784-789,共6页Natural Gas Geoscience

基　　金：国家油气科技重大专项(编号:2011ZX05007-02);博士科研启动基金项目(编号:2013JB03);宿州学院创新团队建设计划资助项目(编号:2013KYTD01)联合资助

摘　　要：库车坳陷克拉苏构造大气田天然气地球化学特征的研究对于天然气的成因类型和气源对比具有重要的意义。通过研究克拉苏构造带超高压大气田的天然气组分和碳同位素特征,分析了天然气的成熟度。研究结果表明,研究区天然气以烃类气体占绝对优势,甲烷含量大于95%的占统计样品的78%。δ13C1值从-33.1‰～-25.1‰,主频率分布在-32‰～-28‰之间,δ13 C2值从-28.1‰～-16.8‰,主频率分布在-20‰～-18‰之间,δ13C3值从-25.1‰～-15.7‰,主频率分布在-20‰～-18‰之间。总的来说,研究区超高压大气田烷烃气组分碳同位素组成普遍较重,组分偏干。研究结果对超高压大气田的形成具有重要的指示意义。The geochemical characteristics of natural gas play an important part in the research of accumula-tion mechanism. The characteristics of gas component and its carbon isotope in Kelasu tectonic zone were discussed, and the maturity of the natural gas was analyzed. It is indicated that natural gas in this large gas field is dominated by hydrocarbon, and the content of methane accounts for more than 90%. The dryness coefficient is over 97% ,which indicates the natural gas is dry gas. The value of δ^13C1 is from -33.1‰ to -25. l‰,and the main distribution interval is from -32‰ to -28‰. The value of δ^13C1 is from -28.1‰ to -16.81‰,and the main distribution interval is -20‰ to -18‰. In general, natural gas in the over-pressured large gas field from Kelasu tectonic zone is typical dry gas with high carbon isotope of methane and ethane. Our research result has important designative meaning for accumulation of overpressure large gas field.

关 键 词：大气田 超高压 地球化学 克拉苏构造带 

分 类 号：TE122.113[石油与天然气工程—油气勘探]