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Using a method based on geology, the U.S. Geological Survey estimates that the Cooper Basin of Australia holds, on average, 482 million barrels of oil and 29.8 trillion cubic feet of gas in continuous (unconventional) accumulations that could be recovered with current technology.
The geology
The Cooper Basin lies within what the USGS calls the Eromanga Basin Province. The assessment defines a Cooper-Eromanga Composite Total Petroleum System whose main source rock for oil and gas is Permian coal. Its geological models:
- Tight gas: gas generated from the coals (or from cracking of oil) builds up pressure and migrates into tight sandstones, saturating them regionally; the model also allows for deep coalbed gas.
- Coal oil: some of the oil or condensate generated in the coals stays in them, a self-sourced reservoir.
- Coalbed gas in the Weena Trough is gas that stayed in the coal beds.
The seven assessment units of the Cooper Basin, around the corner of Queensland, South Australia and New South Wales. USGS map, on a National Park Service base.
Drainage areas, recovery per well and success rates came from U.S. shale-gas and shale-oil analogs.
The results
| Assessment unit | Oil, mean (million barrels) | Gas, mean (billion cubic feet) | Natural gas liquids, mean (million barrels) |
|---|---|---|---|
| Patchawarra Trough Tight Gas | — | 2,259 | 8 |
| Nappamerri Trough Tight Gas | — | 14,781 | 22 |
| Queensland Troughs Tight Gas | — | 9,926 | 15 |
| Patchawarra Trough Coal Oil | 113 | 531 | 8 |
| Nappamerri Trough Coal Oil | 134 | 886 | 12 |
| Queensland Troughs Coal Oil | 235 | 1,102 | 15 |
| Weena Trough Coalbed Gas | — | 299 | 0 |
| Total | 482 (0 to 1,444) | 29,784 (7,803 to 58,965) | 80 (11 to 205) |
Totals show the range from a 95 percent to a 5 percent chance. About half the gas is expected in the Nappamerri Trough Tight Gas unit. Known conventional resources in the basin's rocks are about 42 million barrels of oil and 5.5 trillion cubic feet of gas, so the continuous resources are significant — though the oil estimates carry considerable geological uncertainty, and some of the "oil" may turn out to be condensate.
The sheet gives the mean gas total as 29,784 billion cubic feet in one sentence and 29,781 in another; its table adds up to 29,784.
Sources
- Cooper Basin Assessment Team (Christopher J. Schenk, Marilyn E. Tennyson, Tracey J. Mercier, Timothy R. Klett, Thomas M. Finn, Phuong A. Le, Michael E. Brownfield, Stephanie B. Gaswirth, Kristen R. Marra, Sarah J. Hawkins and Heidi M. Leathers-Miller), Assessment of Continuous Oil and Gas Resources of the Cooper Basin, Australia, 2016, USGS Fact Sheet 2016–3050. https://doi.org/10.3133/fs20163050
- Results: USGS Energy Resources Program, http://energy.usgs.gov
Licença: CC0 1.0 (domínio público) · Adaptado de pubs.usgs.gov
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