Abstract: The hydrocarbons in Australia northwest shelf are mainly concentrated in the Mesozoic plays, which can be divided into Triassic play, Jurassic play and Cretaceous play. The source rocks originated from the shales of Triassic, Jurassic and Cretaceous. The regional cap rocks are mainly a set of the Cretaceous shale. The trap type is dominated by structural trap, including fault block trap and horst trap. Peak of hydrocarbon generation was taken place in the Jurassic and Cretaceous, while peak of gas generation was mainly in the Cenozoic, and the northern part was earlier than the southern part. The fault was important channels for oil and gas migration in it