Whiting’s proved reserves
At the end of 2015, Whiting Petroleum’s (WLL) proved reserves were ~821 million boe (barrels of oil equivalent), as compared to 780.3 million boe at the end of 2014.
Reserve replacement ratio
Whiting’s reserve replacement ratio in 2015 was 168%, as compared to ~917% in 2014. Remember, reserve replacement ratio indicates the number of barrels of oil equivalent that a company adds to its reserve base in relation to the amount of oil and gas it produces.
By comparison, upstream peers Newfield Exploration (NFX), Hess (HES), and Apache (APA) had reserve replacement ratios of -141%, -148%, and -308%, respectively, in 2015. These companies together make up 3.6% of the Energy Select Sector SPDR ETF (XLE).