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The Sângeorgiu de Pădure gas field natural gas field is located near Sângeorgiu de Pădure in Mureș County, Romania. It was discovered in 1920 and developed by Romgaz. It began production in 1925 and produces natural gas and condensates. The total proven reserves of the Sângeorgiu de Pădure gas field are around 871 billion cubic feet (25 km³), and production is slated to be around 55 million cubic feet/day (1.55×106m³) in 2010.

Framework
Romania has important quantities of methane gas reserves, especially in the Transylvanian Depression, south and north of the Mureș River, at Puini, Zau de Câmpie, Luduș, Șincai, Bazna, Nadeș, etc, where about 75% of the 0.1 e12m3 of the country's natural gas reserves are located. The gas fields in Mureș County alone (the main ones being at Sărmașu, Sărmășel, Ulieș, Sânmărtin, Crăiești, Zau de Câmpie, and Luduș) provide 60% of the total extracted in Romania. The Transylvanian Basin is the geological unit with the largest and most natural gas reserves in Romania; it is the single sediment basin in the country and among the few in the world where only gas accumulations, mainly methane, have been discovered.

In 1970, Romania ranked fourth in the world and second in Europe in the size of its natural gas deposits; by 2016, it ranked third in Europe after the Netherlands and the United Kingdom. The United States Geological Survey's 2000 World Energy assessment ranked the Transylvanian Basin region as the 56th largest in the world (exclusive of the United States), with 0.2% of the world's oil and gas resources, based on volume of reserves plus cumulative production.

History
The gas deposits in Romania have a very long history of exploitation, almost unique at the level of Europe and among the few such old fields that are still in production in the world. The oldest deposits exploited by Romgaz are in Mureș County, where gas has been extracted since 1913. Deposits of methane gas occur in three main areas; the first are is in the northwest and includes the Sărmașel, Zau de Câmpie, and Șincai gas fields. The North Group contains 31 gas fields located to the north of the Mureș River. These are found under the form of dome traps. Representative for this group are the Sărmașel, Grebenișu de Câmpie, Zau de Câmpie, and Țaga gas fields.

The first natural gas deposit in Romania was discovered in 1909, in Sărmașel, about 22 km north of Zau de Câmpie. In 1913, the first production of methane gas was recorded, of 113000 m3, from the drilling site at the Sărmașel gas field. That year, the local Greek Catholic priest announced to the Zau de Câmpie community that they will start "to dig for gas, in the form of the one from Sărmașel," on a 2400 m2 plot of land belonging to the church. Besides Sărmășel and Zau de Câmpie, other gas fields developed in the area were the ones at Deleni, Nadeș, Bazna, and Șincai, followed later by those at Bogata, Ilimbav, Miercurea Nirajului, Tăuni, Teleac, and Filitelnic.

The first geological study of the Zau de Câmpie gas dome (in connection with the classification of mud volcanoes and salt mines in the Transylvanian Plain) was done by Augustin Vancea in his 1929 Ph.D. dissertation. According to a CIA report from 1948 (quoting an article from the communist party organ Scînteia), the Zau de Câmpie gas field was under geological study since 1935, and exploration was begun in 1948, when an important deposit of gas was discovered at a depth of 633 m. Concomitantly, the Ceanu Mare–Cluj pipeline was being constructed, with the Zau de Câmpie wells due to supply natural gas to the city of Cluj.

Current production and reserves
The gas produced at Zau de Câmpie and in the surrounding area is considered to be the purest one; it consists of dry gases, usually made of 99% methane, with the rest hydrocarbons (ethane, propane, and butane). It currently uses a type C 25.1 Thomassen compressor unit to compress the gas extracted in the field.

In 2009, the total proven reserves of the Zau de Câmpie gas field were around 416 billion cubic feet (12 km³), and production was slated to be around 3.6 million cubic feet/day (0.1×105 m³) in 2010. By January 2017, there were 62 active drilling rigs at the site; the reserves of the Zau de Câmpie–Șăulia gas field were estimated at 2.47 e9m3, and were slated to be depleted by 2029. In July 2018, the Romanian Romanian Agency for Mineral Resources announced that the Romgaz lease of the gas field has been extended until 2027.