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金湖凹陷原油族组成具典型未熟-低熟油的特征,普遍检出热稳定性低的化合物,碳优势指数、奇偶优势与藿烷成熟度参数体现成熟特征,但甾烷成熟度参数存在明显变化,原油来自4个不同成熟度的运聚场,定量计算了不同地区的未熟油混合比例。盐城凹陷凝析油具与湖相原油和海相原油相似的混源特征,轻质组分反映一种高成熟演化特征,中等组分体现出未熟-低熟的特征,重组分反映达到或超过了主要生油演化阶段,下生上储成藏模式使高成熟天然气对成熟原油进行了气洗作用,造成了凝析油的“特殊”特征。
The composition of the crude oil in the Jinhu depression is characterized by the characteristics of typical under-ripened and low-mature oil, and the compounds with low thermal stability are generally detected. The carbon predominance, parity and hopane maturity parameters reflect the maturity characteristics, but there are obvious maturity parameters Changes, the crude oil from the four different maturity of the Yun Chang, quantitative calculation of different parts of the miscure oil mixing ratio. The Yancheng sag has similar mixed-source characteristics with the lacustrine oil and marine oil. The light fraction reflects a high-maturity evolution characteristic. The middle fraction shows the characteristics of immature-low maturity. The heavy fraction reflects or exceeds The main oil evolution stage, the next generation of reservoir accumulation mode so that high-mature natural gas mature gas was air-washing effect, resulting in condensate “special ” characteristics.