According to an analysis of geochemical field in Qianjiadian sag, the authors revealed the intrinsic relationship between geochemical anomalies and the migration-enrichment of hydrocarbon. It is pointed out the future work should rely on the hydrocarbon and reservoir-forming conditions on the slope belt of the Hulihai depression to further determine and close the sand bodies in the favorable geochemical zone from Hulihai depression to east Xiboyingzi depression, with the near-source place as the major exploration target.