original_query: What is the level of uncertainty regarding the size and quality of oil resources in ANWR?
query: What is the level of uncertainty regarding the size and quality of oil resources in ANWR?
answer: The Department of Energy reports considerable uncertainty about the underlying resource base in ANWR.  Estimates are based largely on neighboring State lands' oil productivity, which continues into ANWR.  Therefore, there's significant uncertainty regarding both the size and quality of oil resources.  This uncertainty is also due to the use of extremely low price per barrel figures in the estimates of technically recoverable oil.