How many years of oil exploitation in Tianjin Dagang?

At present, there are many newly discovered reserves while exploiting crude oil every year, which can be exploited for a long time until all the discovered reserves are lit up. This time may be 10 years or 30-50 years. As early as 10 years ago, it was said that Dagang's oil could be exploited for another 20 years, but there is no sign of resource exhaustion so far. With the establishment of Nangang Heavy Chemical Industry Zone, Tianjin's crude oil processing capacity far exceeds the supply capacity of Dagang Oilfield, and it will mainly import crude oil in the future. As an old oil field in the east, Dagang plays a stable role in the supply of crude oil in the Bohai Rim region, and is no longer the main oil field.