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The three assessment units in the greater Taranaki Basin and East Coast Basin of New Zealand. USGS map.
The estimate
Using a geology-based assessment method, the U.S. Geological Survey estimated the undiscovered, technically recoverable conventional oil and gas in three assessment units of the greater Taranaki Basin and the East Coast Basin of New Zealand. Here the greater Taranaki Basin takes in what are locally called the Taranaki Basin, the Western Platform, the Deepwater Taranaki Basin and the Deepwater Northland Basin.
| Resource | Mean | Range (F95–F5) |
|---|---|---|
| Oil | 806 million barrels (0.8 billion) | 249 to 1,892 million barrels |
| Gas | 16,950 billion cubic feet (17.0 trillion) | 7,894 to 31,163 billion cubic feet |
| Natural gas liquids | 367 million barrels (0.4 billion) | 177 to 656 million barrels |
F95 means a 95-percent chance of at least the amount shown; F5 is defined the same way. All results are fully risked.
The petroleum systems
- Mesozoic–Cenozoic Composite: source rocks range from Late Cretaceous to Eocene coal beds and carbonaceous shales to Paleogene organic-rich marine shales.
- Taranaki Mesozoic–Cenozoic Reservoirs: oil and gas from coal and shale sources are thought to have migrated into sandstones laid down by rivers, alluvial fans, deltas, the shelf and deep water, and into platform-margin carbonate reservoirs.
- Deepwater Taranaki–Northland Reservoirs: reservoirs beyond the shelf edge, where oil and gas mainly from coal beds and Paleogene marine shales migrated into rocks ranging from rift-era river and delta sandstones to slope-channel and basin-floor fan sandstones.
- East Coast Basin Mesozoic–Cenozoic: oil and gas generated within an accretionary prism and trapped in convergent margin reservoirs. Its one unit, the East Coast Basin Convergent Margin Reservoirs, includes possible sandstone reservoirs in the forearc basin and accretionary prism, with oil and gas generated from Paleogene marine shales and gas of biogenic origin.
Results by assessment unit
| Assessment unit | Oil in oil fields, mean (million barrels) | Gas in gas fields, mean (billion cubic feet) |
|---|---|---|
| Taranaki Mesozoic–Cenozoic Reservoirs | 45 | 5,243 |
| Deepwater Taranaki–Northland Reservoirs | 716 | 5,901 |
| East Coast Basin Convergent Margin Reservoirs | 45 | 3,861 |
| All units (gas includes gas found with oil) | 806 | 16,950 |
Sources
Based on the USGS, "Assessment of Undiscovered Conventional Oil and Gas Resources of the Greater Taranaki Basin and East Coast Basin of New Zealand, 2020," Fact Sheet 2021–3059, May 2022, U.S. Geological Survey; a work of the United States government in the public domain. The import had scrambled the fact sheet's text; its text, map and results are taken from the PDF.
Lizenz: CC0 1.0 (gemeinfrei) · Bearbeitet nach pubs.usgs.gov
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