岩性油气藏 ›› 2020, Vol. 32 ›› Issue (3): 104114.doi: 10.12108/yxyqc.20200310
山鑫杰1,2, 王飞宇1,2, 刘念1,2, 冯伟平1,2, 江涛1,2, 杜喜1,2, 程志强1,2, 李思嘉1,2, 李月1,2
SHAN Xinjie1,2, WANG Feiyu1,2, LIU Nian1,2, FENG Weiping1,2, JIANG Tao1,2, DU Xi1,2, CHENG Zhiqiang1,2, LI Sijia1,2, LI Yue1,2
摘要: 呼仁布其凹陷位于二连盆地西部的巴音宝力格隆起中段,前期勘探已发现优质烃源岩和较好的油气显示,但凹陷南洼烃源岩的研究还比较薄弱。通过对呼仁布其凹陷南洼烃源岩测井地球化学评价以及烃源岩和原油样品的有机地球化学对比,揭示了其下白垩统烃源岩有机相分布、烃源岩地球化学特征和油源关系。结果表明:呼仁布其凹陷南洼下白垩统烃源岩主要分布于南洼漕东部,发育阿尔善组、腾一段和腾二段等3套烃源岩,其中阿尔善组烃源岩处于低成熟—成熟阶段,腾一段烃源岩处于低成熟阶段,腾二段烃源岩处于未成熟—低成熟阶段。呼仁布其凹陷南洼下白垩统3个层段均发育C相和D/E相烃源岩,其中,C相烃源岩主要分布于腾一段,厚度为300~400 m,初始氢指数为400~800 mg(/g TOC),显微组分多为腐泥组、壳质组和镜质组,母质来源主要为藻类等低等水生生物,形成于微咸水—半咸水、还原环境;D/E相烃源岩主要分布于阿尔善组,厚度为100~200 m,初始氢指数为200~400 mg(/g TOC),显微组分多为壳质组、镜质组和惰质组,母质来源主要为陆源高等植物,形成于淡水—微咸水、弱还原环境。油源对比认为:阿尔善组的成熟原油来源于阿尔善组烃源岩,腾一段成熟度较低的原油来源于腾一段烃源岩,而腾二段的原油可能来源于腾一段烃源岩。
中图分类号:
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