松辽盆地无机成因烃类气藏的幔源贡献

MANTLE SOURCE CONTRIBUTION OF INORGANIC GENETIC HYDROCARBON GAS RESERVOIR IN SONGLIAO BASIN

幔源氦对氦含量的贡献值不能完全代表其它组分的幔源贡献。依据松辽盆地的地质条件和勘探成果并通过筛选该盆地实际气藏组分的混合模拟结果 ,得到了松辽盆地昌德、肇州西和升深 2井等 3个气藏无机成因的贡献大于 80 %的结论 ,说明松辽盆地无机成因的气源是非常巨大的。同时指出 ,松辽盆地有机成因与无机成因甲烷碳同位素的判别界限定为 - 30‰比较合适 ,天然气样品中单独的3He 4

The contribution volume of mantle source He to He content cannot completely represent the mantle source contribution of other components. Based on the geologic condition and exploration results in Songliao Basin and the mixed analog results sieving of the actual gas reservoir components in this basin, we conclude that the inorganic genetic contribution in 3 gas reservoir, Changde, Zhaozhou and Shengshen 2 well, is above 80%. This proves that the inorganic genetic gas resource in Songliao Basin is significant. It is also pointed out in this paper that the suitable diagnostic limit of organic genetic CH\-4 isotope and inorganic genetic one in Songliao Basin is -30‰. The contribution volume of mantle source He obtained according to the index of\+3He/\+4He cannot represent the mantle source contribution of inorganic genetic hydrocarbon gas in gas reservoir.