陕北地区延长组长10油层组油源对比研究

Research on Oil Source Correlation of Changl0 Oil Reservoir Group of Yanchang Formation in Northern Shaanxi Area

陕北地区长10油层组为鄂尔多斯盆地石油勘探发现的含油新层系。本文采用地质与地球化学相结合的方法，通过长10原油地球化学特征分析与长7和长9两套烃源岩地球化学特征对比．根据长10储层流体包裹体均一温度分布特征与长7烃源岩供烃层位储层流体包裹体均一温度分布特征的差异，结合长10油层组钻孔含油显示与两套烃源岩分布关系等手段，对长10油层组油源进行综合判识。研究结果表明，长10油层组的油源主要为长9烃源岩，长7烃源岩有贡献，但作用有限。

Changl0 oil reservoir group in Northeru Shaanxi is a hydrocarbon-bearing formation series newly found in oil exploration of Ordos Basin. In this paper, the oil source of Chang10 oil reservoir group is comprehensively identified, by adopting the combination of geological and geochemical methods, through analysis of geochemical characteristics of crude oil from Changl0 reservoirs and contrast of geochemical characteristics of two sets of source rock of Chang7 and Chang9, according to the difference between fluid inclusion homogenization temperature distribution in Changl0 reservoir and hydrocarbon supplying horizons of Chang7 source rock, and combined with oil-bearing show by drilling in Changl0 oil group and distribution relationship between two sets of source rocks. The research resuhs show that the oil source of Changl0 oil group is mainly Chang9 source rock; with some contribution from Chang7 source rock, but limited.