Editor's note: This material was presented at the 17th ASEG Geophysical Conference and Exhibition.

A series of oil and gas fields have been discovered since 1979 in the Early Cretaceous Flag Sandstone in the Barrow Sub-basin of Western Australia's Carnarvon Basin. The Flag Sandstone is a lowstand complex of gravity flow sandstones deposited beyond the shelf edge of the Barrow delta. Figure 1 shows a stratigraphic chart. The permeable Flag Sandstone forms a consistent, high-quality reservoir that is capped by the impermeable Muderong shale. In the area immediately adjacent to and south of Varanus Island, the main trapping mechanism is...

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