Based on new theories and methods of petroleum geology, the relationship between tectonics and sedimentary history was researched using comprehensive exploration achievements and geological data. Most structural lithologic traps were found in the relatively steep slope positions of the hanging wall of the principle boundary faults and its major co\|rotating adjustment faults, while most structural traps were found in the relatively slow slope positions. The control of sand body distribution and physical property characteristics on oil\|gas migration and accumulation are very important. The sandbodies in Es₂ and Es₃ which were so thick and widely spread, contacting directly with the hydrocarbon source rocks in the sag, were great oil\|gas migration channels and traps; the thick sandbodies in Es₄ which were also contacting with hydrocarbon source rocks, were also the oil\|gas migration channels and traps, though they were basically distributed at the edge of the depression. The subaqueous fan and turbidite fan in the area were surrounded by oil source rocks, so oil and gas could enter the sandbodies directly. The main power for oil\|gas migration was from overpressure environment in the deep sag. After generation, oil and gas migrated to shallow and lateral parts in the conducting system composed by oil source faults, reservoir sandbodies and unconformity surface, thus various reservoirs were formed. During migration, pathways were complicated because of secondary faults and heterogeneity of sandstones.