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二连裂谷系由５０多个断陷组成。主要的烃源层是下白垩统巴彦花群。在相同的区域构造作用下，断陷群既有相似的构造发展史，又有独立的沉积单元和明显的外在可分性。裂谷期后的区域抬升作用导致烃源岩的成熟度偏低，并且各断陷之间有机质的热演化程度相差悬殊。通过区域地温场的对比和大量的有机地化资料分析研究，明确了各断陷有机质热演化特征，建立了断陷群烃源岩有机质的热演化生烃模式，总结归纳出二连裂谷系三种类型断陷烃源岩的成油带长度及生油气潜力，指出Ⅰ类断陷为含油断陷，是二连裂谷断陷群中最有勘探前景的断陷。
The second rift system consists of more than 50 faults. The main hydrocarbon source is Lower Cretaceous Bayan flower group. Under the same regional tectonics, the fault depressions have similar tectonic history, independent sedimentary units and obvious external separability. The regional uplift after the rifting period led to the low maturity of the source rocks and the great difference in the thermal evolution of organic matter between the rifts. Based on the comparison of regional geothermal field and a large amount of organic geochemical data, the thermal evolution characteristics of organic matter in each faulted depression were clarified, and the thermal evolution hydrocarbon generation model of organic matter in source rocks was established. Finally, It is pointed out that the type Ⅰ fault depression is an oil-bearing fault, which is the most prospective fault in the Erlian rift faulted group.