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通过对徐家围子地区天然气组分、同位素资料以及气体包裹体资料的综合分析认为 ,该地区存在无机成因天然气。烃类气体中具有重碳同位素异常 ( >- 2 0‰ )和负碳同位素系列(δ13C1>δ13C2 >δ13C3)的同位素分布特征 ,表现出无机成因烃类气体的特点。高含量的无机CO2 气体和幔源氦的发现 ,指示着该区无机成因天然气主要来自于地球的深部。地幔热柱上升在地壳不同圈层中引起的岩浆火山活动是无机天然气的主要来源 ,而由此形成的地壳“网状”结构和基底大断裂是无机气上升运移至浅部聚集成藏的主要运移通道。构造活动间歇期和活动期分别以渗流方式和幕式涌流方式向上运移可能是深部流体运移的两种主要方式。古隆起带、岩浆侵入带以及基底大断裂带是无机成因天然气的有利聚集带。
Based on the comprehensive analysis of natural gas composition, isotopic data and gas inclusions in the Xujiaweizi area, it is considered that there is inorganic gas in this area. Hydrocarbon gases have the characteristics of isotopic anomalies (> -20 ‰) and negative carbon isotopic series (δ13C1> δ13C2> δ13C3), showing the characteristics of inorganic hydrocarbon gases. The discovery of high-level inorganic CO2 gas and mantle-derived helium indicates that the inorganic origin of natural gas in this area mainly comes from the deep part of the earth. The volcanic activity of magma caused by the rise of mantle plume in different layers of the crust is the main source of inorganic gas, and the crustal “network” structure and basement faults formed by this are the uplifting of inorganic gas to shallow accumulation The main transport channel. The upward movement of the tectonic activity between the intermittent phase and the active phase respectively by seepage and curtain inrush currents may be the two main modes of deep fluid migration. Paleo uplift, magmatic intrusive belt and basement big fault zone are favorable agglomeration belts of inorganic genetic gas.