【摘要】 酒西盆地主力烃源岩为下白垩统下沟组和赤金堡组暗色半深湖相-深湖相的白云质泥岩和泥质白云岩,是典型的湖相碳酸盐岩烃源岩。通过对酒西盆地下白垩统二百多块湖相碳酸盐岩烃源岩详细的有机岩石学研究,解剖了湖相碳酸盐岩烃源岩中有机质的赋存形式,揭示了藻纹层为有机质纹层的主要发育形式,其与富泥晶白云石纹层和富粘土纹层构成湖相碳酸盐岩烃源岩特有的"三元式纹层"沉积结构,系统总结了各显微组分的光性、成因、生烃性及分布规律,提出了以全岩和干酪根为基础的湖相碳酸盐岩有机显微组分分类方案,首次鉴定出对酒西盆地油气有贡献的主要生烃组分为腐泥无定形体、腐殖无定形体以及浮游藻类体、孢粉体、壳屑体五种有机显微组分。更多还原

【Abstract】 The typical lacustrine carbonate source rocks include dark dolomitic mudstone and argillaceous dolomite of Chijinpu and Xiagou formations of Lower Cretaceous,which represent major petroleum source rocks in Jiuxi basin,NW China.Over 200 samples were selected from Lower Cretaceous lacustrine carbonate source rocks in Jiuxi basin for a detailed organic petrology analysis.Organic laminae has been recognized which is mainly algal laminae and "three-layer" structure is unique for lacustrine carbonate source rocks,which consists of algal laminae,micrite dolomite laminae and clay laminae.A petrographic classification of macerals in lacustrine carbonate source rocks has been suggested on the basis of whole rock and kerogen analysis.The discussion has also been carried out on the origins,the optical properities,hydrocarbon generation potential and geological distribution of macerals in these lacustrine carbonate source rocks.Five major hydrocarbon-generating macerals contributed to petroleum resources are firstly identified which are sapropelic amorphogen,humic amorphogen,alginite,sporopollenite and liptodetrinite in Jiuxi basin.更多还原