It depends on the situation of the state.
In at least the short/medium term, Pakistan won't be exporting the oil and gas, but meeting its own needs. This will have the effect of shaving $12 billion off Pakistan's imports and, in turn, bring the trade deficit down.
I just hope Pakistan avoids the trap of exporting oil, gas, minerals, etc without a plan to use the profits to bolster the manufacturing industries. The long-term ForEx drivers should be machines, electronics, steel, composites, and engineering services, not natural resources. The natural resources should just be a stopgap or cushion.
@Khafee @Oscar @JamD My fear is that we short-cut like Nigeria, Venezuela, etc did, e.g., export natural resources, get cash, import like nuts.