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地球学报  2007 

欧利坨子火山岩油藏原油特征及成因分析

DOI: 10.3975/cagsb.2007.04.07

Keywords: 火山岩,原油,生物标志物,碳同位素,辽河盆地

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Abstract:

火山活动可能对烃源岩的演化过程产生重要影响.通过对欧利坨子原油地球化学特征的研究,发现原油性质的差异同储集层与火山口的相对位置有着密切的关系,在火山口附近的粗面岩储集层中,原油的饱和烃及其单体碳同位素值偏轻,类异戊二烯烃的碳同位素负异常基本消失,原油的CPI和OEP值较低(平均为1.21和1.06).虽然火山岩储集层中油气显示良好,有多口井获得工业油流,但油藏的开发效果差别较大.研究表明,火山活动对火山口附近烃源岩的影响不可忽视,在埋藏深度相对较浅的粗面岩储层中,主要富集了未熟或低熟烃源岩因火山作用而快速

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