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柴达木盆地北缘东段中下侏罗统孢粉相及生烃潜力

, PP. 1268-1273

Keywords: 孢粉相,生烃潜力,中下侏罗统,柴达木盆地北缘东段

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Abstract:

孢粉相是反映沉积物及其成岩作用环境的沉积有机质组合。为了评价柴达木盆地北缘东段中下侏罗统烃源岩生烃潜力,对中下侏罗统孢粉相进行了详细研究,基于有机质组份的鉴定和统计,将中下侏罗统划分为5个孢粉相带第Ⅰ孢粉相带为煤质—具结构陆生质有机质组合,分布在小煤沟组;第Ⅱ孢粉相带为无定型有机质组合,分布在大煤沟组1段;第Ⅲ孢粉相带为煤质—草质有机质组合,分布在大煤沟组2~4段。第Ⅳ孢粉相带为无定型—草质有机质组合,分布在大煤沟组5段;第Ⅴ孢粉相带为无定型—半无定型—结构水生质有机质组合,分布在大煤沟组第7段。大煤沟组第1段、第7段烃源岩孢粉相带有机质类型最好,是最有利的生油气层段,其次是大煤沟组第5段,其它层段生烃潜力差。

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