Carbon Isotope Characteristics and the Influencing Factors of the Oils from Lunnan and Hadexun Oil Fields
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摘要: 轮南地区与哈得逊地区20个原油的全油碳同位素和正构烷烃单体烃碳同位素的分析结果表明:轮南地区原油的全油碳同位素均大于-32‰,而哈得逊地区原油的全油碳同位素一般小于-32‰;原油正构烷烃单体烃碳同位素也表现出轮南地区重于哈得逊地区的特征。两地区原油碳同位素的这种特征是由于两地区油气成藏过程的差异造成的,轮南地区原油碳同位素比哈得逊地区的原油碳同位素重的主要原因是由于来源于寒武系降解原油的混入,而非油源不同造成的。Abstract: The analytical results of the whole and the monomer paraffin hydrocarbons carbon isotope of the 20 oils from Lunnan and Hadexun oil fields show that the whole carbon isotope of the oils from Lunnan area is more than 32‰, and that of the oils from Hadexun area is less than 32‰, the carbon isotope of monomer paraffin hydrocarbons of the oils from Lunnan area is also heavier than that of the oils from Hadexun area. That the carbon isotope of oils from Lunnan area heavier than that of oils from Lunnan area caused the difference between the oil pools formation in the two areas. The main factor resulted in the carbon isotope of oils from Lunnan area heavier than that of oils from Hadexun area is the mixture between the degraded oil from the Cambrian source rock and the oils from MiddleUpper Ordovician source rock, instead of the different source rocks of the oils.
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