I guess ill be nice then
While this is one cavity of oil it does not generally affect any other cavities. The earth is not all linked. Sure it might be linked to a couple others. If this just keeps going it may make a tiny dent in the world oil volume but not much.
and yeah generally it would just leak out but with most oil wells they pump it up to keep volume force. There isn't any real telling how the pressure here will be affected over time. (how long it takes for some of the pressure to be gone and slow down the seepage)