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准噶尔盆地南缘地区发育40多个背斜构造、5套有效烃源岩,大多数背斜构造发现了油气或存在油气苗,原油性质呈现多样性变化,长期以来对该地区不同构造原油的来源存在多种观点。在南缘地区典型原油地球化学特征与油源对比的基础上,选择了南缘地区具有代表性的典型背斜构造油藏,对其原油油源进行了深入细致的解剖研究。结果表明,南缘地区绝大多数背斜构造油藏原油为单一烃源来源,不同时代烃源岩生成原油混合现象并不普遍,只有少数油藏存在混源油。不同区域背斜构造原油油源存在较大差异,原油来源严格受控于有效烃源岩的分布:二叠系来源的原油主要分布于南缘中部以东的山前构造,侏罗系来源的原油主要分布于南缘西部及南缘东部构造,白垩系来源的原油仅分布于南缘中部构造,古近系来源的原油仅分布于南缘西部构造;齐古油田侏罗系油藏原油为二叠系与侏罗系原油的混合,各自的贡献约占50%。
There are more than 40 anticlines and 5 effective hydrocarbon source rocks in the southern margin of the Junggar Basin. Most anticlinal structures have found oil and gas or oil and gas, and the nature of crude oil shows diversity. For a long time, the source of different structural crude oil in this area There are many points of view. On the basis of the geochemical characteristics and oil source of the typical crude oil in the southern margin, a representative typical anticline structural reservoir in the southern margin has been selected and its crude oil source has been studied thoroughly and carefully. The results show that most of the anticline oil reservoirs in the southern margin are single hydrocarbon source, and the generation of crude oil from different source rocks is not common. Only a few reservoirs have mixed source oil. The source of crude oil is controlled strictly by the distribution of available source rocks: the Permian source crude oil is mainly distributed in the piedmont structure to the east of the central southern margin, and the Jurassic source The crude oil is mainly distributed in the western part of the southern margin and the eastern part of the southern margin. The crude oil of Cretaceous origin is only distributed in the central part of the southern margin. The crude oil of Paleogene origin is only distributed in the western part of the southern margin. The crude oil of the Jurassic reservoir of Qigu Oilfield is Permian and Jurassic mixed crude oil, each contributing about 50%.