If foreign investment doesnt come, state owned enterprises must step in. The same like Indonesia when we see stall investment in one of our big gas block, Jokowi asked Pertamina to step in. That is order from President.
Any way, in oil and gas business, there is specialization. If Pakistan doesnt have the necessary technology and human resources in oil and gas sector, Pakistan can hire foreign workforce like the way Turkey hire Indonesian expert on their new found oil and gas block. Pakistan can also hire foreign drilling specialized company to do exploration drilling.
Why Pakistan dont do thing like that ? Budget constrain. This is why I stress many time that Pakistan should decrease its defense spending from around 4 % of GDP into 1 % of GDP, and use that money for strategic investment, infrastructure development, and education