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Geochemistry and origin of crude oils of the Yanchang formation in Jiyuan area
Author(s): 
Pages: 76-82
Year: Issue:  7
Journal: Petrochemical Industry Application

Keyword:  地球化学油源;
Abstract: 利用族组成、碳同位素、饱和烃气相色谱-质谱等方法,系统地分析了姬塬地区延长组原油与烃源岩的地球化学特征,并进行油源对比及成因分析.研究表明,原油的δ13CPDB值介于-32.79%~-30.69‰,碳同位素组成偏轻,与盆地中生界各产层湖相油型油一致.甾烷中含一定的孕甾烷、升孕甾烷和重排甾烷,αβ和βα构型甾烷丰富,原生甾烷的“V”字型分布反映了湖相油型油的特征,原油多呈五环萜烷含量高,17α(H)-C30重排藿烷(C30*)相对丰度存在显著差异,伽马蜡烷含量低的特征.油油,油源对比显示,姬塬地区延长组的原油形成于弱还原和淡水,微咸水环境,主要来自于长7油层组烃源岩.
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