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North Slope Basin Essay

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Brown, Jacob E., The North Slope Basin, Alaska The North Slope is a foreland basin that spans the entire width of Northern Alaska. The northern boundary of the basin is just off shore of the Coastal Plain Province where it meets the Beaufort Sea (Figure 1). The Barrow Arch, a subsurface passive high margin, is the boundary between the North Slope Basin and the Canada Basin that extends north into the Artic Sea. The southern boundary is Brooks Range, a thrust-fault mountain belt that extends from the Rocky Mountains of Canada. The western boundary of the basin extends into the Chukchi Sea and ends at the U.S.-U.S.S.R. boundary. The eastern portion of the basin ends at the Canada-U.S. boundary at the coastal edge. The entirety of the North Slope Basin is approximately 1000 km (600 mi) long, 50 to 350 km (30 to 215 mi) wide, and covers an area of about …show more content…

The Prudhoe Bay field is a deltaic high quality sandstone reservoir that is about 500 feet thick with porosity in the 15-30%. The Permian to Triassic age horizon is the largest producing in the field and is referred to as the Ivishak reservoir. The reservoir is made up of a series of clasitc near-shore marine deposits as well as sandstones and conglomeratic braided-stream deposits (Erikson, Sneider 1997). The reservoir is a structural stratigraphic trap by faulting in the north and south. It is bounded in the north and south by major faulting in the the Barrow Arch and Brooks Range mountains (Figure 5). The east is a truncated Cretaceous horizon that separates it from the Canadian basin. The Prudhoe Bay field is 225 square miles and was discovered in 1968 but because of how remote and undeveloped that area was at the time, exploration did not begin until 1977. Since then it has developed into the largest oil and gas play in North America (Figure 6). Figure 7 highlights the source/reservoir rocks and the types of ongoing and potential

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