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Y盆地天然气中普遍含有非烃N_2和CO_2,且N_2含量与无机CO_2总体呈相互消长关系,而与CH_4为主的烃类气正相关。非烃N_2依据其含量可划分为低含N_2(N_2<10％)、含N_2(N_2=10％～15％)和富(高)N_2天然气(N_2>15％)等三类,而N_2成因则根据其地质地球化学特征及伴生稀有气体同位素特点,可将其综合判识为大气成因、壳源有机成因及壳源有机—无机混合成因等三种成因类型。N_2总体分布特征多具有平面上分区分块、剖面上集中富集于400～1600m的浅层或超浅层的特点。N_2与CO_2及烃类气的共生组合关系,常常具有有机成因的富N_2天然气与低含量有机CO_2及高含量CH_4为主的烃类气伴生,而有机—无机混合成因的低含N_2、含N_2天然气则多与高含量无机CO_2及部分CH_4为主烃类气并存的组合特征。很显然,这种共生组合关系决定了N_2的成因及气源构成特点。因此,基于N_2成因类型及与CO_2及烃类气的共生组合关系和分布特征,结合地质地球化学的综合分析研究,可以综合判识N_2气源。
Natural gas in the Y basin generally contains non-hydrocarbon N 2 and CO 2, and the content of N 2 and total amount of inorganic CO 2 show a negative correlation with each other, while the CH 4 -based hydrocarbon gas is positively correlated. According to the content of non-hydrocarbon N_2, N_2 (N_2 <10%), N_2 (N_2 = 10% ~ 15%) and N_2> 15% According to their geo-geochemical characteristics and associated rare gas isotopic characteristics, they can be synthetically identified as the genesis of the genesis, the organic origin of the crust, and the organic-inorganic hybrid origin of the crust. The general distribution features of N 2 are mostly divided into blocks on the plane, and concentrated in the superficial and shallow superficial layers of 400-1600 m. The symbiotic relationship between N_2 and CO_2 and hydrocarbon gas is that organic nitrogen rich natural gas is often associated with hydrocarbon gas with low content of organic CO_2 and high content of CH_4 and low content of organic nitrogen with inorganic nitrogen such as N_2 Natural gas is more with high content of inorganic CO 2 and part of CH 4 -based hydrocarbon combination of characteristics. Obviously, this symbiotic relationship determines the formation of N2 and gas source characteristics. Therefore, based on the type of N 2 formation and the symbiotic relationship and distribution characteristics with CO 2 and hydrocarbon gas, combined with the comprehensive analysis of geo-geochemistry, the N 2 gas source can be comprehensively identified.