Study on Geochemical Characters and Origin of Deep Natural Gas in Volcanic Rock Reservoir, Songnan Gas Field of Southern Soliao Basin

• 责任者：Jiao Lili (Institute of Planning and Designing ; Subsidiary Company of East China ; SINOPEC ; Najing 210031 ; China) ; Luo Xiaoping
• 刊名：Journal of Mineralogy and Petrology
• 出版年：2010
• 卷期：30(2)
• 关键词：天然气成因 ; natural gas origin ; 松辽平原 ; Songliao Plain
• 页码：p.103-110
• 图表：5 illus., 6 tables, 18 refs.
• 分类号：1003
• issnNo：ISSN1001-6872
• isbnNo：CN51-1143/TD

 Analysis of natural gas compositions, carbon isotopes and isotopic characteristics of inert gas in the volcanic reservoirs of Yingcheng and Denglouku Formation in the Yingcheng fault depression reveals that the hydrocarbons in the natural gas are mainly composed of methane, containing a very small amount of heavy hydrocarbons with a drying coefficient about 0.99（dry gas）. The facts that methane isotope is slightly heavy（-18.3‰ ~^-26.5‰） and the carbon isotope sequence is negative（δ¹³C₁> δ¹³C₂> δ¹³C₃） indicates that the gas is characteristics of inorganic origin. Analysis of characteristics of CO₂ isotopes and high ³He/⁴He ratio in the Yingcheng formation demonstrate that the gas is inorganic in origin with a mixing of ³He/⁴He from crust.