| Torok Formation | |
|---|---|
| Stratigraphic range: Cretaceous | |
| Type | Formation |
| Location | |
| Region | Alaska |
| Country | United States |
The Torok Formation is a geologic formation in the National Petroleum Reserve in Alaska (NPR-A). It preserves fossils dating back to the Cretaceous period.
The Torok Formation lies 2,000–4,000 feet deeper than the Nanushuk Formation. They form a huge wedge of sediment deposited in a deep water basin and stretch from north of the Brooks Range beneath the Alaska North Slope to the adjacent offshore. It contains reservoirs in turbidite sandstone and is very porous. The USGS found large-scale folds and faults in the South of the formation and evidence, that the rocks have been heated to temperatures at which oil is converted to natural gas. [1]
The Torok Formation was deposited on the floor of the Alaska North Slope basin. [1]
In 2016, oil discovery in the deeper Torok Formation of more than 1,000 MMBO was announced at Smith Bay, less than 1 mile offshore from the NPR-A. [1] It came at the same time as ConocoPhillips discovery of Willow project, which at 300 MMBO is less than a third of the size. [1]
The Campos Basin is one of 12 coastal sedimentary basins of Brazil. It spans both onshore and offshore parts of the South Atlantic with the onshore part located near Rio de Janeiro. The basin originated in Neocomian stage of the Cretaceous period 145–130 million years ago during the breakup of Gondwana. It has a total area of about 115,000 square kilometres (44,000 sq mi), with the onshore portion small at only 500 square kilometres (190 sq mi).
The Alaska North Slope is the region of the U.S. state of Alaska located on the northern slope of the Brooks Range along the coast of two marginal seas of the Arctic Ocean, the Chukchi Sea being on the western side of Point Barrow, and the Beaufort Sea on the eastern. With the exception of the highway connecting Fairbanks to Prudhoe Bay, the region is disconnected from the rest of the Alaskan road system and relies mostly on waterways and small airports for transportation due to the Brooks Range secluding the region from the rest of the state.
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The Nanushuk Formation or NanushukGroup is a geologic group in Alaska in westernmost National Petroleum Reserve in Alaska (NPR-A). Petroleum in these rocks likely was generated beneath Western Alaska North Slope and migrated northeastward into NPR-A. The formation preserves fossils dating back to the Albian-Cenomanian ages of the Cretaceous period. Its thickness varies from about 1500 to about 250 metres. Underneath the Nanushuk lies the Torok Formation.
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The Alaskan North Slope (ANS) is a foreland basin located on the northern edge of the Brooks Range. The Alaska North Slope is bounded on the north by the Beaufort Sea and runs from the Canadian border to the maritime boundary with Russia in the west. The western edge extends into the Chukchi Sea and Chukchi platform where the basin is at its widest. As the basin moves east it narrows towards the Canadian border. The basin is 1000 km long, 600 km at its widest, and covers a total area of 240,000 km2.
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