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以四川盆地高石梯—磨溪大气田为例,对震旦系灯影组、寒武系龙王庙组天然气稀有气体进行全组分含量和同位素检测,并判别其成因。高石梯—磨溪大气田天然气中稀有气体He含量高于大气中He含量1~2个数量级,其中灯二段天然气中He平均含量为512×10-6,达到工业利用标准;而Ne、Ar、Kr、Xe含量相对较低,低于大气含量值。稀有气体全组分含量总体由震旦系灯二段、灯四段至寒武系龙王庙组逐渐降低。高石梯—磨溪大气田天然气中稀有气体3He/4He值总体为10-8量级,40Ar/36Ar值总体为1 024~9 559,132Xe相对过剩而129Xe相对亏损,表明He、Ar、Xe均为典型壳源成因,且气田深部没有活动性强的深大断裂和通幔断裂,构造活动较为稳定。图5表1参32
Taking the Gaoshiti-Moxi gas field in Sichuan Basin as an example, the authors investigated the composition and isotope of gas from the gas reservoirs of the Sinian Dengying Formation and the Cambrian Longwangmiao Formation, and determined their causes. The content of rare gas in natural gas from Gobi-Moxi gas field is 1 ~ 2 orders of magnitude higher than that in the atmosphere, of which He average content is 512 × 10-6, which meets the industrial standard. Ne and Ar , Kr, Xe content is relatively low, lower than the atmospheric content value. The content of all components of rare gas in general by the Sinian Department of light two, four sections of the light to the Cambrian Longwangmiao gradually reduce. The 3He / 4He value of rare gas in the gas from Moguchi Gas Field is generally 10-8, and the values of 40Ar / 36Ar are generally 1 024 ~ 9 559 and 132Xe, while the relative loss of 129Xe indicates that He, Ar and Xe are all The origin of the typical crust is that there is no active deep deep faults and Tong Mantai faults in the deep gas field, and the tectonic activities are relatively stable. Figure 5 Table 1 Reference 32