天然气地球科学 ›› 2020, Vol. 31 ›› Issue (1): 6172.doi: 10.11764/j.issn.1672-1926.2019.10.001
张迈1,2(),刘成林1,2(),田继先3,庞皓4,曾旭3,孔骅3,杨赛1,2
Mai ZHANG1,2(),Cheng-lin LIU1,2(),Ji-xian TIAN3,Hao PANG4,Xu ZENG3,Hua KONG3,Sai YANG1,2
摘要:
柴达木盆地西部地区(简称柴西)新生界蕴藏着十分丰富的油气资源,勘探前景良好。根据原油和烃源岩中的生物标志物组成特征,对柴西原油的成熟度、沉积环境及生物来源等进行了探讨,从而进行原油成因类型划分以及油源对比。研究发现柴西原油显示出低成熟—成熟原油的特征且形成于水体盐度较高的还原性环境,有机质来源为混合源,低等水生植物输入量较大。根据原油的沉积环境、母质来源和成熟度特征,柴西原油可划分为4类:Ⅰ类来自于狮子沟—跃进地区,伽马蜡烷含量高,姥植比低,具有C27甾烷优势,有“翘尾”现象;Ⅱ类来自于切克里克—扎哈泉及南翼山—油泉子一带,伽马蜡烷含量较Ⅰ类低,具有C27甾烷优势,无“翘尾”现象;Ⅲ类来自于大风山、黄瓜峁等地区,具有C29甾烷优势,无“翘尾”现象;Ⅳ类来自于开特米里克地区,伽马蜡烷含量较前3类低,具有C27甾烷优势,无“翘尾”现象。油源对比结果表明,柴西原油主要来自E3和N1烃源岩。
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