BACKGROUND, HISTORY AND STATUS OF GEOTHERMAL USE IN BEIJING
The City of Beijing is rich with low-temperature geothermal resources, and the area identified with geothermal potential is 2,760km2, divided into 10 geothermal fields, including the one in the southeastern part of the urban area and the one at Xiaotangshan. The geothermal reservoir is made of limestone or dolomite that is karsted. The production temperature is 38-89°C. Geothermal explorations started in the 1950s and large-scale geothermal development started in the early 1970s in Beijing. After that, the number of geothermal wells has been ever increasing, and in 1985 the annual production of geothermal water has increased to more than 10 million m3, causing a fast decline of the water level in the geothermal wells. Although the amount of geothermal water production was decreased, and the annual drawdown of the water level became smaller, the water level continued to decline. At present, there have been about 400 geothermal wells, and the annual geothermal water production is 7-9 million m3. The geothermal water, containing components good for human health, is used for various direct purposes, including space heating, bathing, greenhouses, fish farming, health spa and recreation, bringing great economical, environmental and social benefits. In 2005, the geothermal water production was 7.7 million m3. The related economical profit was about 1.1 billion YUAN (about 110 million EURO); the energy used accounts for 85.8 thousand tons of coal; the CO2 emission reduction is about 204.7 thousand tons. The water level of most geothermal wells is still declining often l-2m annually, because of the production of geothermal water is still more than the recharge of the geothermal systems, while reinjection is still not very much. Therefore, it is essential to control the production and expand the scale of reinjection. It is also very important to strengthen the monitoring and modelling of the geothermal system, especially to set up detailed numerical models in the most developed geothermal fields.
Liu Jiurong
Beijing Institute of Geological Engineering No.90, Beiwa Road Beijing 100037 CHINA
国际会议
Workshop for Decision Makers on Direct Heating Use of Geothermal Resources in Asia(亚洲地热资源直接利用国际研讨会)
天津
英文
110-119
2008-05-11（万方平台首次上网日期，不代表论文的发表时间）