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苏里格石盒子组天然气常规组成中烷烃气含量一般在90%以上,其中甲烷含量占绝对优势。天然气干燥系数(C1/C2+)变化范围较大,在5～140之间,并且随深度的增加呈现升高的趋势。二氧化碳含量普遍小于3%。烷烃气碳同位素具有典型煤成气的特征,但是部分样品乙烷碳同位素偏轻,有少数出现单项性碳同位素倒转。根据煤成气碳同位素与镜质体公式,计算出天然气的成熟度明显低于其C-P源岩的成熟度。综合分析认为,苏里格地区石盒子组天然气组成显示出具有多期成藏的特征,成熟早期充注的天然气仍然具有较好的保存。
The conventional gas composition of natural gas in the Sulige Stone Box Sub-Group is generally above 90%, of which the methane content is predominant. Natural gas drying coefficient (C1 / C2 +) varies widely, ranging from 5 to 140, and shows an increasing trend with increasing depth. Carbon dioxide content is generally less than 3%. Alkane gas carbon isotopes are typical coal-formed gas characteristics, but some of the samples have light carbon isotopes and a few carbon isotope inversion events. According to the carbon isotopic composition of anthropogenic gas and vitrinite, the maturity of natural gas is calculated to be significantly lower than the maturity of its C-P source rock. According to a comprehensive analysis, the natural gas composition of Shihezi Formation in the Sulige area shows the characteristics of multi-period accumulation, and the natural gas filled in the early mature period still has good preservation.