. fsp no . fas 19-1 2013 effective january 1 , 2005 , marathon adopted fsp no . fas 19-1 , 2018 2018accounting for suspended well costs , 2019 2019 which amended the guidance for suspended exploratory well costs in sfas no . 19 , 2018 2018financial accounting and reporting by oil and gas producing companies . 2019 2019 sfas no . 19 requires costs of drilling exploratory wells to be capitalized pending determination of whether the well has found proved reserves . when a classification of proved .