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The five conventional assessment units in four geologic provinces of Western Australia. USGS map.
The estimate
Using a geology-based assessment method, the U.S. Geological Survey estimated the undiscovered, technically recoverable conventional oil and gas of four geologic provinces of Western Australia — the Perth Basin, NW Shelf, Browse Basin and Bonaparte Gulf Basin — with fully risked means of:
| Resource | Mean | Range (F95–F5) |
|---|---|---|
| Oil | 906 million barrels (0.9 billion) | 594 to 1,300 million barrels |
| Gas | 132,837 billion cubic feet (132.8 trillion) | 76,942 to 203,932 billion cubic feet |
| Natural gas liquids | 2,508 million barrels (2.5 billion) | 1,436 to 3,877 million barrels |
F95 means a 95-percent chance of at least the amount shown; F5 is defined the same way.
Of the gas, about 81 percent — 108,393 billion cubic feet — is estimated to lie in the NW Shelf Province.
The geology
The source rocks along Australia's western continental margin reflect its tectonic history: Permian lake and marine shales, Permian coals and carbonaceous shales, Triassic marine shales, Jurassic coals and carbonaceous shales, and Cretaceous marine shales. Buried under as much as 6 kilometers of sediment along the margin, most of them now lie in the thermal gas window — though maturity, thickness and quality vary in complex ways across this vast, structured margin.
Because the geology varies and the geochemistry of the several possible source rocks is unevenly understood, the USGS defined five composite total petroleum systems in the four provinces, with five assessment units drawn to take in that variability.
Results by assessment unit
| Assessment unit | Oil in oil fields, mean (million barrels) | Gas in gas fields, mean (billion cubic feet) |
|---|---|---|
| Perth Upper Paleozoic–Mesozoic Reservoirs | 109 | 15,288 |
| NW Shelf Mesozoic–Cenozoic Reservoirs | 322 | 71,316 |
| Browse Upper Paleozoic–Cenozoic Reservoirs | 173 | 32,962 |
| Bonaparte Petrel Upper Paleozoic–Mesozoic Reservoirs | 43 | 2,921 |
| Bonaparte Mesozoic–Cenozoic Reservoirs | 259 | 8,940 |
| All units (gas includes gas found with oil) | 906 | 132,837 |
Sources
Based on the USGS, "Assessment of Undiscovered Conventional Oil and Gas Resources of the Perth Basin, NW Shelf, Browse Basin, and Bonaparte Gulf Basin Provinces of Western Australia, 2020," Fact Sheet 2021–3060, May 2022, U.S. Geological Survey; a work of the United States government in the public domain. The map and the unit-by-unit results are taken from the fact sheet's PDF.
Licencia: CC0 1.0 (dominio público) · Adaptado de pubs.usgs.gov
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