6 seismic data lines were acquired by Esso Australia Ltd from the Outer Ex mouth of Barrow Subbasin of Perth Australia the data was interpreted for possible oil or gas production. The analysis was carried out using the Dug Insight software. The main events picked were the sea floor at a depth of 1371m, Base Tertiary at a depth of 1826m, Cretaceous at a depth of 2170m and Triassic at a depth of 2403m with some minor events. Two distinct areas where found to have been productive and the porosities of the two areas are 31.5% and 31.2% with shale volumes of 0.25256 and 0.11687 having thicknesses of 4.0metres and 1.1metres respectively. The basin is characterized by tectonic effects which produce potential structures for both movement, escape with small accumulation as well as traps. The Triassic Limestone formation forms the source rock, the Lower Cretaceous Sandstone forms the reservoir while the Upper Cretaceous Limestone forms the seal. The huge 3D seismic data acquired over the area of the margin has not resulted in large exploration successes. This is because of the simple effective traps at base regional seal level being beneath the amplitude floor, however, some quantity of gas reserves remains undeveloped, together with some potential condensate reserves.