Abstract: As exploration activity in Damintun has entered into middle- late stage, basement hydrocarbon reservoir will be the main target for further exploration. By means of fluid heterogeneity inversion on hydrocarbon filling direction, high - waxy oil in Damintun depression is mainly considered to come from Anfutun sag and Shengdong sag, and Anfutu sag is the primary hydrocarbon kitchen. Dam-ingtun depression can be divided into six petroleum migration and accumulation units according to the tectonic feature, reservoir distribution and hydrocarbon filling direction. The comprehensive evaluation shows that other five units have great exploration potential except Shongsheng-pu sag unit and Santaizi sag unit.