张强凹陷七家子洼陷沙海组烃源岩地球化学特征

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七家子洼陷是张强凹陷南部地区的生油洼陷,其主要生油层位是沙海组,分为Ⅰ、Ⅱ油组,七家子洼陷沙海组烃源岩主要是暗色泥岩。厚度大、质地纯、分布面积广。有机质类型主要为腐殖一腐泥型、腐泥一腐殖型。通过对烃源岩样品的有机碳、氟仿沥青“A”、总烃、生烃潜量及烃转化率等丰度指标进行分析,表明该区烃源岩有机质丰度高,是品质较好的生油岩,为南部地区的各类圈闭提供了充足的油源。
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