--> Abstract: Petroleum Prospectivity in Precambrian and Early Paleozoic Basins, Australia, by B. A. Goldstein; #91004 (1991)

Datapages, Inc.Print this page

Petroleum Prospectivity in Precambrian and Early Paleozoic Basins, Australia

GOLDSTEIN, BARRY A, Bridge Oil Ltd., Sydney, Australia

Proterozoic to Devonian age strata with some potential for petroleum accumulations are known from sedimentary basins covering approximately 1,870,000 sq km onshore Australia Portions of these very old basins have not sustained the deleterious effects of deep burial. Explorers with vision continue to target these very old rocks in the MacArthur/ South Nicholson, Amadeus, Canning, Adavale, and Bonaparte basins. Approximately 429,000 sq km of these basins remain under license for petroleum exploration.

The oldest known oil in Australia is reservoired within and sourced from the mid-Proterozoic in the McArthur basin. Marine shales of the Arenigian-Llanvirnian, Frasnian, and Tournaisian have significant petroleum source potential in parts of these old basins.

The Early Ordovician Pacoota Sandstone of the Amadeus basin is the oldest formation commercially exploited for oil and gas in Australia. Oil is produced from Fammennian fringing algal reef and superposed, draped oolitic facies at Blina field in the Canning basin.

Significant discoveries awaiting development include Dingo (gas in the Proterozoic Arumbera Sandstone, Amadeus basin), Pictor (oil and gas in dolomitized Llanvirnian-Llandeilian algal mat facies, Canning basin), and Gilmore (gas in the Middle Devonian Lissoy Sandstone, Adavale basin).

The Tern gas field trap in the Bonaparte basin is related to a salt diapir; the salt probably being Silurian-Devonian in age. Salt probably of the same age has formed diapirs in the Canning basin, too. Cambrian and Proterozoic salt-bearing strata are likewise the cause and core of some anticlinal and diapiric structures in the Amadeus basin.

Minor oil shows have been reported from the Cambrian of the Officer basin. The Warburton, Pedirka, Arrowie, Ord, Wiso, Georgina, and Ngalia basins contain Proterozoic and early Paleozoic sedimentary rocks but are ascribed only limited petroleum prospectivity at this time.

 

AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)