杨亚南1,2,周世新1,李靖1,李成成1,2,李源遽1,2,马瑜1,2,陈克非1,2
Yang Ya-nan1,2,Zhou Shi-xin1,Li Jing1,Li Cheng-cheng1,2,Li Yuan-ju1,2,Ma Yu1,2,Chen Ke-fei1,2
摘要:
对鄂尔多斯盆地南缘延长组长6—长9段烃源岩、油砂岩心样品进行了系统的采集,利用热解分析、TOC含量测定、有机碳同位素分析、GC/MS/MS测试等分析手段,对烃源岩生烃特征、沉积环境及油砂的油源特征进行了研究。结果表明:长6—长9段烃源岩均已达到成熟阶段,其中长73层为最好烃源岩层,其TOC含量平均为13.99%,干酪根类型主要为Ⅰ型;长62层次之,TOC含量平均为4.12%,干酪根类型主要为Ⅰ+Ⅱ1型;长9段烃源岩TOC含量平均为2.85%,有机质类型主要为Ⅱ1+Ⅱ2型。长6—长9段烃源岩样品形成于典型的淡水湖泊环境,长8—长9段沉积时期Pr/Ph>1,沉积水体较浅,为亚氧化_强氧化沉积环境,以陆源有机质输入为主;长6—长7段沉积时期Pr/Ph<1为还原环境,沉积水体较深,有机质来源为低等水生生物和陆源高等植物混源。研究区长6—长9段烃源岩生烃特征与其沉积环境息息相关,沉积环境还原性越强,陆源有机质输入越少,烃源岩生烃特征越好。聚类分析油源对比结果显示:研究区长7—长8段油砂样品的油源主要为长73层烃源岩。
中图分类号:
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