【摘要】 根据天然气的地球化学特征、烃源岩的热演化和气势演化探讨柴达木盆地南八仙气田的气派，认为其天然气并非来自于赛什腾凹陷，而是主要来自于西侧的伊克雅汝乌凹陷。伊克雅汝乌凹陷是重要的煤成气生气中心，煤成气生气中心对气田的分布有明显的控制作用，处于伊克雅汝乌生气中心或生气中心附近的有效圈闭是煤成气聚集的有利场所，因此伊克雅汝乌、冷湖构造带东南段和马海—南八仙地区具有良好的天然气勘探前景。图3表3参5（赵林摘）更多还原

【Abstract】 Based on the analysis of geochemical features, thermal evolution degree of Jurassic coal measures and gas potential evolution, this paper discusses the source of Nanbaxian gas field. δ13C1 value and △(δ13C2 -δ13C1 ) of natural gas show that thermal degree of natural gas in Nanbaxian gas field is higher than that of Jurassic coal measures in Nanbaxian and surrounding areas such as Saishiteng sag and Beilingqiu sag, but corresponds to that of Jurassic coal measures in Yikeyaruwu sag. According to the evolution of gas potential of Jurassic rerervoirs, natural gas of Nanbaxian-Mahai is derived from Yikeyaruwu sag which is an important gasgenerating center. Thus the southeastern Lenghu structure belt, Eboliang Ⅲ structure and Nanbaxian-Mahai which are nearby Yikeyaruwu sag are favorable areas for gas exploration.更多还原