二连盆地由５０多个断陷组成，主要的烃源岩是下白垩统巴彦花群，从烃源岩的干酪根及热解等资料分析来看，生油岩母质类型以Ⅱ１－Ⅱ２型为主，是典型的混合型生油岩；而烃源岩的可溶性有机质鉴定结果发现含有大量的高等植物标志化合物，说明早白垩世断陷湖泊有机质主要来源于高等植物，分析认为这一现象是由于高等植物“腐泥化”的结果，并通过有机相综合分析，明确了断陷群不同相带的生烃潜力及成油特征，并指明断陷群的勘探前景． The Erlian Basin is composed of more than 50 faults and the main source rock is the Bayanhua group of the Lower Cretaceous. According to the analysis of the kerogen and pyrolysis data of source rocks, the parent material types of Ⅱ 11-Ⅱ 2 Type, and is a typical mixed source rock. However, the results of soluble organic matter identification of source rocks show that there are a large number of higher plant marker compounds, indicating that the organic matter mainly originated from higher plants in the Early Cretaceous fault-lacustrine lake. The analysis shows that this phenomenon Is the result of “sapropelification” of higher plants. Through the comprehensive analysis of organic phase, the hydrocarbon generation potential and oil formation characteristics of different facies belts of the fault-depression group are clearly identified, and the exploration prospect of the fault-depression group is indicated.