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鄂尔多斯盆地及邻区中元古代整体处于地壳伸展的构造背景,沉积了巨厚的中元古界蓟县系海相地层。为落实该盆地西南缘蓟县系油气的勘探潜力,对该区蓟县系的地层特征、沉积特征、岩石地球化学和有机地球化学特征进行了分析。结果表明:该区蓟县系形成于碳酸盐潮坪沉积环境,风暴沉积序列广泛发育;该区具有大陆边缘性质,蓟县系硅质岩为生物成因背景。结论认为,从蓟县系可能烃源岩的有机质丰度、类型及有机质成熟度等方面来评价了其生烃潜力,认为其生烃能力较差。
The Mesoproterozoic in the Ordos Basin and its adjacent area is in the tectonic setting of the extensional crustal crust, with a thick sedimentary marine facies in the Jixian system of the Middle Proterozoic. In order to implement the exploration potential of Jixian oil and gas in the southwestern margin of the basin, the stratigraphic features, sedimentary characteristics, lithogeochemistry and organic geochemistry of the Jixian system in this area were analyzed. The results show that the Jixian system formed in the carbonate tidal flat depositional environment and the sequence of storm deposits developed extensively. The area is continental margin and the Jixian silicalite is the biologic genesis background. The conclusion is that the hydrocarbon potential of the source rocks in Jixian might be evaluated by their organic matter abundance, type and organic matter maturity, which are considered as poor hydrocarbon generation ability.