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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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天然气中n2的成因与富集
, PP. 23-27
Keywords: 天然气,氮,成因,聚集,沉积(地质),有机质,铵,粘土矿物,裂解,变质作用
Abstract:
？研究天然气中n2的成因与富集有助于了解含油气盆地烃源岩的热演化阶段和天然气成藏史,有助于了解盆地的油气资源潜力,以便指导油气资源评价和降低勘探风险.地下n2的潜在来源很多,每种来源对天然气的可能贡献量都不尽相同.天然气中n2的主要成因有:①沉积有机质在过成熟阶段高温裂解产生的n2;②沉积岩中铵粘土矿物变质作用释放出n2;③沉积有机质在成熟阶段经热氨化作用形成的n2;④沉积有机质在未成熟阶段经微生物氨化作用形成的n2;⑤大气源的n2;⑥地壳超深部和上地幔来源的原生n2;⑦蒸发盐岩中硝酸盐经化学还原作用和微生物反硝化作用生成的n2.天然气中n2富集的原因可能是:①富n2和富ch4是不同源的,或同一源但不同阶段所形成的,它们在运移、聚集和保存过程中没有混合;②低n2气经过运移,n2和ch4发生了有效的地质色层分异作用.
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