吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (5): 1270-1284.doi: 10.13278/j.cnki.jjuese.20180155
曾文人1,2, 孟庆涛1,2, 刘招君1,2, 徐银波3, 孙平昌1,2, 王克兵1,2
Zeng Wenren1,2, Meng Qingtao1,2, Liu Zhaojun1,2, Xu Yinbo3, Sun Pingchang1,2, Wang Kebing1,2
摘要: 根据Leco(莱科)、岩石热解、GC(气相色谱)和GC-MS(气相色谱/质谱)等分析,开展了柴达木盆地北缘团鱼山地区中侏罗统石门沟组油页岩有机地球化学特征研究,探讨了油页岩的生烃潜力、有机母质来源、沉积环境及成矿差异。结果表明:石门沟组页岩段共发育3层油页岩(自下而上分别为油1、油2和油3),油页岩w(TOC)较高,平均值为8.16%,有机质类型为Ⅰ型和Ⅱ1型,整体生烃潜力较好,且油1、油2的生烃潜力高于油3;样品中检测出丰富的正构烷烃、类异戊二烯烷烃、甾类化合物、萜类化合物和芳香烃化合物,其中,正构烷烃呈单峰式分布,主峰碳数为nC23或nC27,Pr/Ph值为0.20~1.08,油1、油2的C27/C29值、芳基类异戊二烯烃、藿烷和藿烯质量分数明显比油3高,揭示油1、油2形成于强还原条件,有机母质来源以低等水生生物为主,油3形成于弱还原-还原条件,有机母质来源具有陆源高等植物与低等水生生物双重生源特征。结合油页岩特征的差异及古湖泊条件,说明较深的湖水并不是形成优质油页岩的必要条件,藻类、细菌等提供优质有机质的生物输入以及底层水的强还原条件更有利于优质油页岩的形成。
中图分类号:
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