Stratigraphic and Tectonic Controls on the Distribution and Architecture of Fluvial Oil and Gas Reservoirs
Significant volumes of oil and gas are trapped in fluvial sandstones. Major reservoirs include the Statfjord Formation (Triassic-Jurassic) of the North Sea Basin, the Sadlerochit Group (Permian-Triassic) of Prudhoe Bay on the Alaskan North Slope, the Lower Cretaceous reservoirs of the giant Daqing field of the Songliao Basin, China, the heavy-oil sands of the Cretaceous Athabasca and related deposits in Alberta, Canada, and numerous large to small fields in mature areas such as the Alberta Basin (Mannville fields, Cretaceous-age reservoirs), the southern Midcontinent (Cherokee fields, Pennsylvanian), and Gulf Coast (Cretaceous Tuscaloosa and Travis Peak fields, and Oligocene Frio fields). The tectonic setting and reservoir geometries of these and other fluvial reservoirs are varied, but this chapter demonstrates that oil and gas fields in fluvial sandstones fall into three broad classes, on the basis of two major descriptive criteria. An extensive review of fields around the world is drawn upon to illustrate this classification.
KeywordsForeland Basin Ordo Basin Songliao Basin Forearc Basin Sandstone Body
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