Why did the five major cities in Heilongjiang not have Daqing in the early days of liberation?

In the early days of liberation, there was no oil in Daqing. After liberation, in order to get rid of China's oil-free hat, Li Siguang discovered oil in a certain area of ??Heilongjiang and developed it. It was later named Daqing, which means to celebrate China's getting rid of its oil-free hat. That seems to be the meaning. I am also talking nonsense. If there is any similarity, it is a coincidence.