The Chukchi Borderland is both a stand-alone petroleum province and assessment unit (AU) that lies north of the Chukchi Sea. It is a bathymetrically high-standing block of continental crust that was probably rifted from the Canadian continental margin. The sum of our knowledge of this province is based upon geophysical data (seismic,gravity, and magnetic) and a limited number of seafloor core and dredge samples.
As expected from the limited data set, and the basin’s petroleum potential is poorly known. A single assessment unit,the Chukchi Borderland AU, was defined and assigned an overall probability of approximately a 5 percent chance of at least one petroleum accumulation >50 million barrels of oil equivalent (MMBOE). No quantitative assessment of sizes and numbers of petroleum accumulations was conducted for this AU.
Source: usgs.gov