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Figure 1. Map of Northern Alaska showing boundaries of the six assessment units (AUs) in the National Petroleum Reserve in Alaska (NPR-A) and adjacent areas. Assessment units include State waters. Older AUs assessed in 2010 are not shown. (ANWR, Arctic National Wildlife Refuge; H, Horseshoe; P, Pikka; S, Smith Bay; U, Umiat; W, Willow) Introduction Recent exploration drilling has resulted in significant oil discoveries in the Cretaceous Nanushuk and Torok Formations in and near the National Petroleum Reserve in Alaska (NPR-A). These new discoveries have spurred exploration activity in the region and have increased demand for enhanced information regarding the oil-resource potential of these formations. New U.S. Geological Survey (USGS) estimates of undiscovered, technically recoverable oil and gas resources in conventional accumulations across the entire onshore and State-waters extent of the Nanushuk and Torok Formations update previous assessments for these two formations (Bird and others, 2005; Houseknecht and others, 2010). This fact sheet also includes a summary of 2010 assessment results for older rocks in the NPR-A; no updated assessment was conducted as those rocks have not been penetrated by exploration drilling since 2010, and thus no new information is available about their oil and gas potential.

fact sheet

Assessment of undiscovered oil and gas resources in the Cretaceous Nanushuk and Torok Formations, Alaska North Slope, and summary of resource potential of the National Petroleum Reserve in Alaska, 2017