Abstract: Based on the seismic and drilling data and the provenance-supply mode, the sedimentary sequence, provenance features and oil-gas exploration prospects are analyzed. The study area has the typical double-layer geologic structure of rift-depression, and has double provenance supply in the north and south. The provenance supply in rifting period was mainly from the southern Darwin shelf, and was also from the northern Sahul Platform, while the provenance supply in depression period was mainly from the southern Darwin shelf. In the rifting period, the southern sediment formed a large-scale progradation body, and encountered the delta formed by the northern provenance in the central depression; in the depression period, large-scale neritic deposits developed in Cretaceous, and relatively large-scale platform limestone developed in Sahul Platform and its surroundings in the study area. The seismic data and basin data indicate that, the multi-stage reservoirs of delta, fan delta and shore of Jurassic-Cretaceous could be the good exploration targets