The suspected sabotage attack took place in the Do?ubeyaz?t district, some 15 kilometers from the border with Iran, the Anadolu news agency quoted Turkish Energy Minister Taner Y?ld?z as saying in a statement late on Monday.
No one has immediately claimed responsibility for the blast but some local media say the outlawed Kurdistan Workers' Party (PKK) is behind the attack.
"The explosion caused a fire breakout; however, in a short time we managed to extinguish it. After repairing it, the gas flow will resume," Y?ld?z said.
He added that necessary measures would be taken to meet the areas natural gas demand until the pipeline is repaired.
Iran is Turkeys second-biggest gas supplier after Russia.
Earlier in the day, a paramilitary police commander was shot dead in a mainly Kurdish region of Mus province in eastern Turkey.
"The commander was subjected to an armed attack around 2100 local time (1800 GMT)," a Turkish hospital source said, adding that the policeman succumbed to his injuries after being rushed to hospital and that some members of his immediate family also sustained injuries in the attack.
No one has claimed responsibility for the killing but Ankara usually blames the PKK for such incidents in the region.
Turkey launched a military campaign against PKK positions in Syria last week, following an ISIL attack in the southwestern Turkish town of Suru, which claimed the lives of at least 32 people, on July 20.
By Press TV
