岩性油气藏 ›› 2021, Vol. 33 ›› Issue (5): 2233.doi: 10.12108/yxyqc.20210503
马博1,2,3, 吉利明1,2,3, 张明震1,2, 金培红1,2, 苑伯超4, 龙礼文5
MA Bo1,2,3, JI Liming1,2,3, ZHANG Mingzhen1,2, JIN Peihong1,2, YUAN Bochao4, LONG Liwen5
摘要: 对酒西盆地下白垩统烃源岩的生烃潜力缺乏系统认识,并对其沉积古环境的认识也存在争议。通过对红柳峡地区下沟组烃源岩的孢粉相和元素地球化学的系统分析,研究烃源岩有机质母质来源、生烃潜力及其沉积古环境特征。结果表明红柳峡地区下沟组发育孢粉相A(植物碎屑-无定形组合),B(无定形组合)和C(植物碎屑组合)3类孢粉相,并且以孢粉相C为主;孢粉有机质整体以陆源高等植物来源的植物碎屑为优势成分,有机质类型主要为Ⅲ型,显示较差的生油潜力,其中下段和上段中的部分层位无定形含量较高,有机质为Ⅱ2型,具有一定的生油潜力;下沟组沉积期为半潮湿-潮湿的气候,且具有晚期逐渐变潮湿的趋势,主要为氧化且生产力较低的微咸水-咸水环境,仅下段和上段中的部分层段表现为较深水的贫氧-缺氧沉积环境;红柳峡地区下沟组以近源冲积扇-三角洲和滨浅湖亚相沉积为主,其中早期和晚期沉积期水体稳定,发育部分较好的烃源岩,中期则发育近源氧化的三角洲-滨浅湖亚相沉积和较差的烃源岩。
中图分类号:
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