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(yü-mŭn), city, NW Gansu prov., China. It was long one of China's leading petroleum centers, with oil fields and refineries, but output has steadily declined since the 1960s. Yumen, on the Old Silk Road to Xinjiang, is named for an ancient gateway in the nearby Great WallGreat Wall of China,
series of fortifications, c.3,890 mi (6,260 km) long (not including trenches and natural defensive barriers), winding across N China from Gansu prov. to Liaoning prov.
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. It is on the railroad that connects Lanzhou and Xinjiang.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also Laochiinmiao), a city in Northwest China, in Kansu Province. Yiimen is served by the Lan-Shin (Lanchou-Urumchi) Railroad. An oil-field center since 1939, the city is linked to Lanchou by an oil pipeline and has two refineries. After new oilfields, such as Tach’ing, were developed in Northeast China in the 1960’s, Yümen lost its importance as the chief center of the petroleum industry of the People’s Republic of China.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
[39] China state Department of Environmental Protection, Environmental impact assessment report publicity: Environmental impact assessment report on Yumen East Town 50MW thermal oil PT-CSP project [Internet], China state Department of Environmental Protection, c2017, http://www.docin.com/ p-1871037172.html.
Ten checkpoints have been set up around Yumen and Chijin.
Yumen is a small city in western Gansu province, which borders Xinjiang.
The National Health and Family Planning Commission has sent disease prevention and control specialists to Yumen to prevent the plague from spreading.
Reports said Yumen is in critical condition and has to be transferred to the Southern Philippines Medical Center in Davao City for further treatment.
Yumen Pass, situated 75 kilometers northwest of Dunhuang, is a history-loaded famous sightseeing area in China.
Yumen was built as a safe guard in the early Han Dynasty when the Huns ceaselessly invaded the Han's area.
Yumen Pass was also a strategic passage of the famous Silk Road in ancient China.
The mention of the Yumen in the poem has made the pass all the more famous.
of Singapore) looks at how the equipment, infrastructure, and trained labor force of the Fushun oil shale industry, developed in Japanese occupied Manchuria during the 1930s, and the Yumen oil field in Western China contributed to China's efforts to discover and exploit the Daqing oil field in Northeast China.
Take one injection-production unit of Yaerxia oilfield in Yumen for the case study; the parameters of reservoir and fluid properties are listed in Table 1, and the relative permeability curves are plotted in Figure 3.