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The main island of Tutuilla and the 3-island Manu’a group are volcanic while Swains island and Rose Atoll are coral reefs, all within oceanic crust of the Pacific tectonic plate.
The Samoan volcanic island chain probably arose as the Pacific tectonic plate moved from east to west over a mantle plume known as the Samoa hotspot. The volcanic islands and seamounts further away from the Samoa hotspot should be progressively older however, Savai'i, the most western of the Samoan islands (part of the country of Samoa), erupted relatively recently.
The Tonga Trench lies just to the south of the island group and it is possible that the volcanoes have a mixed origin associated with both the hotspot and the subduction event along this collision boundary.
Consequently Globalshift regards American Samoa to have no oil and gas potential onshore and offshore.