I mean you're kinda leaving out the part where companies deliberately transfer assets then go out of business to avoid cleaning up their wells. That's often how they've become orphaned.

Conventional oil is legacy at this point in Alberta though -- the broader concern is how much we can expect oil sands facilities to be properly decommissioned and closed up once it becomes uneconomical to sell the stuff in 30-40 years. That has a rather more concerning footprint.