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Basal Oligocene channelling, Barrow Sub-Basin, Carnarvon Basin, Western Australia

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Basal Oligocene channelling, Barrow Sub-Basin, Carnarvon Basin, Western Australia

 

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Publication Name: The Sedimentary Basins of WA

Authors: J.D. Gorter, D.J. Hearty, J.P. Rexilius & S.L. Powell

Publication Volume: 3

Date Published: December 2002

Number of Pages: 37

Reference Type: Book Section

Abstract:

In the area east of the Woollybutt Oil Field in the northern Barrow Sub-basin of the Carnarvon Basin, Australian North West Shelf, channels are dearly defined on 2D and 3D seismic profiles, and by isochrons within mostly
carbonate middle Tertiary strata. Woollybutt 2A intersected the seaward extension of one of these channels, and coarsegrained porous sandstone was encountered. Microfossils indicate that in6ll of this channel occurred during the early Early Oligocene. These data suggest a mechanism for basinward transport of coarse-grained clastics to where they may form viable petroleum traps below sealing marls and fine-grained carbonates of the Oligo-Miocene Mandu Formation progradational facies. In addition, in6ll facies velocities grade laterally from west to east with significant pull-up of the Base Tertiary seismic horizon.

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