 BP acquired the Outer Continental <unk> lease of Keathley Canyon block 102 reference <unk> , <unk> station <unk> , on October 22 , 2003 , in Phase 2 of the Western Gulf of Mexico ( <unk> / <unk> ) Sale 187 . Lower Tertiary rock formations are some of the oldest and most technically challenging offshore rock formations currently drilled for oil , dating to between 23 and 66 million years ago . The plan of exploration was filed in June 2008 . 
