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Six third-order sequences in Paleogene Hunchun Formation and Neogene Tumenzi Formation in the northern depression of Dunhua Basin have been identified�� By extracting the wavelets through multi-channel seismic statistical method and making synthetic seismic record of DC1 well��the authors completed the horizon calibration�� Using the high-resolution inversion data volumes got from model-based well constraint in sequence stratigraphic framework��the authors depicted the plane distribution characteristics of sand content and sand thickness of the target layer�� The contour maps of sand content showed that the provenance was mainly from the southeast of the sag during the deposition of the SH1 �� ST2 �� Throughout the Cenozoic sedimentary period��the supply directions of provenance did not change much��but the intensity gradually strengthened�� The low-value areas of sand content��the high-value areas of the mudstone thickness��the high-value areas of the stratigraphic thickness and the high-value areas of tectonic subsidence were coincident in each sequence unit��indicating that the fractures had strong controlon the deposition�� The high-value areas of mudstone thickness were the main developmental areas for the mudstone�� where were mainly semi-deep lake-deep lake deposits��thus��it can be preliminary predicted that these areas would be the most potential areas of hydrocarbon source rocks��