魏强1,2,李贤庆1,2,孙可欣1,2,李瑾3,肖中尧4,梁万乐1,2,张亚超1,2
Wei Qiang1,2,Li Xian-qing1,2,Sun Ke-xin1,2,Li Jin3,Xiao Zhong-yao4,Liang Wan-le1,2,Zhang Ya-chao1,2
摘要: 利用天然气组分定量、稳定碳同位素组成、流体包裹体显微测温和生烃动力学实验数据,对塔里木盆地库车坳陷克深大气田深层天然气的地球化学特征及成因、储层流体包裹体特征与均一温度、油气充注时间及成藏过程进行研究。结果表明:库车坳陷克深大气田深层天然气以烷烃气为主,甲烷含量占87.30%~98.33%,重烃(C2+)含量占0~0.66%,干燥系数达0.99%~1.0%;δ13C1值、δ13C2值分别为-29.3‰~-26.4‰、-21.4‰~-16.1‰,属于过成熟的煤成气。克深大气田白垩系巴什基奇克组储层发育2期烃类包裹体:第Ⅰ期为发蓝白色荧光的液态烃包裹体,指示早期轻质油充注;第Ⅱ期为无荧光的气态烃包裹体,与其共生的盐水包裹体均一温度为145~160℃,为晚期天然气充注。克深大气田主要经历了库车组沉积期末(约2.5Ma)以来的天然气大量充注,气源主要来自克深井区和拜城凹陷生气中心的侏罗系煤系烃源岩,为深埋快速生烃、强源储压差作用下晚期聚集成藏。
中图分类号:
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