天然气地球科学 ›› 2022, Vol. 33 ›› Issue (9): 14761484.doi: 10.11764/j.issn.1672-1926.2022.04.011
王杰1,2(),贾会冲3,孙晓3,陶成1,2,张毅1,2,马亮帮1,2,王付斌3,姜海健1,2
Jie WANG1,2(),Huichong JIA3,Xiao SUN3,Cheng TAO1,2,Yi ZHANG1,2,Liangbang MA1,2,Fubin WANG3,Haijian JIANG1,2
摘要:
近年来,鄂尔多斯盆地南部(简称鄂南)古生界天然气勘探取得重要进展,展示了良好的勘探前景,但鄂南古生界天然气成因及气源研究相对薄弱,直接制约了下一步的勘探部署。为此通过系统开展富县古生界天然气组分、烷烃气碳氢同位素、稀有气体组分和同位素等地球化学分析,查明了鄂南富县古生界天然气中甲烷占绝对优势,含有一定量的重烃,非烃气CO2、N2含量相对较高,显示其为过成熟阶段生成的干气。鄂南富县古生界天然气以典型油型气为主,煤型气为辅,甲烷和乙烷的碳同位素组成存在倒转现象可能为油型气与煤型气的混合造成,上古生界天然气烷烃气碳同位素组成普遍比下古生界天然气偏重,可能混有相对较多的煤型气。综合运用烃源岩干酪根碳同位素—岩石脱附气碳同位素—天然气乙烷碳同位素、天然气甲烷氢同位素、稀有气体Ar同位素定年等综合地球化学手段,推断出鄂南富县古生界天然气可能主要来源于下古生界马家沟组烃源岩。
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