The SR-71 tech notes describe it as having a delta wing (Ogee applies to an S shaped wing) where the outboard portion has negative conical camber to move the centre of lift inboard to relieve loading on the nacelle carry through structure. Also improves the max lift characteristics of the outboard wing at high angles of attack and enhances crosswind landing capability.
The chines improve directional stability at increasing angles of attack at all speeds, but their primary purpose is to provide a substantial proportion of the total lift at high supersonic speeds and eliminate the need for canards or special nose up (drag producing) trimming devices.