High production of industrial oil and gas has been obtained in Well AH12 for the first time，which opens a new exploration field in high-efficiency reservoirs in Maxi slope. The hydrocarbon accumulation conditions and rules in the Badaowan Formation of Maxi slope are unclear，and the oil and water relations are complex，resulting in the failure of several exploratory wells. A large amount of data of geology，seismic，engineering and laboratory test were comprehensively applied to analyze the reservoir type，accumulation characteristics and patterns of reservoirs in the Badaowan Formation，and the exploration directions were pointed out. The results show that the oil and gas of the Badaowan Formation were mainly migrated from the source rock in the Permian Fengcheng Formation. The high-quality sand bodies of subaqueous distributary channel in the braided river delta of the first member of Badaowan Formation are favorable reservoirs；while the top lacustrine mudstones of the formation act as the cap rock. On this basis，a favorable reservoir-seal assemblage was formed.Two types of high-effective carrier system，the straight-through type and the relay type，were built at the high angle faults that formed during the Hercynian-Indosinian and the Indosinian-Yanshan periods. The oil reservoir types in the study area are fault-block type and fault-lithologic type，which are controlled by inherited nosing structure，lithofacies and effective layouts of faults and sand bodies. The model of hydrocarbon reservoir formation is characterized by“source rock supplying hydrocarbon，faults providing migration paths through strata，hydrocarbon accumulation in nosing structure and faults and lithology controlling reservoirs”. The middle-shallow layer hydrocarbon exploration should be based on the structural background，and more attention should be paid on effective oil-migrating faults and zones of fault nose and uplift. Reservoirs which are covered by the flooding shale in the Karamay，Badaowan and Sangonghe Formation are the most favorable zone.