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从分类、成因、分布、生烃能力及主生气期等方面对四川盆地震旦系—下古生界的沥青进行了系统分析。主要分布在泥页岩中的原生—同层沥青和在碳酸盐岩储集层中的后生—储层沥青,按全岩光片形态及光性特征可分为5种类型。在层系上以灯影组沥青含量较丰富,在区带上以乐山—龙女寺古隆起分布多,从坳陷带(0.41%)、斜坡带(0.93%～1.13%)、隆起部(2.4%～5.41%)沥青含量逐渐升高;沥青在古风化面含量最高,向下沥青含量相对降低。震旦系灯影组沥青形成于中侏罗世,主生气在早白垩世,晚于干酪根,生烃能力强力,可形成中型气田规模。
The bitumen of the Sinian-Lower Paleozoic in the Sichuan Basin was systematically analyzed from the aspects of classification, genesis, distribution, hydrocarbon generation ability and main gas period. The primary-strata bitumen, mainly distributed in shale, and the epigenetic-reservoir bitumen in carbonate reservoirs can be classified into five types according to the shape and phototropism of the whole rock sheet. In the strata, the Group of Asphalting has more bitumen content, and is distributed mainly in the Leshan-Long Nun Temple paleo-uplift in the belt, ranging from the depression zone (0.41%), the slope zone (0.93% -1.13%), the bulge % ~ 5.41%) asphalt content gradually increased; bitumen in the ancient weathered surface content is highest, down asphalt content is relatively reduced. Sinian Dengying formation bitumen formed in the Middle Jurassic, the main gas in the Early Cretaceous, later than kerogen, strong hydrocarbon generation, can form a medium-sized gas field scale.