Proceedings of the 6th New Zealand Geothermal Workshop 1985. Assessment of the Beijing geothermal prospect : P.R. China. New Zealand Geothermal Workshop [7-9 Nov. 1984, New Zealand].

Hochstein, M.P. Mckibbin, R. Yang, Yutang.

[1984]

171
CIENA

0-86869-056-2

Warm water - 40 to 70°C - is produced from two deep dolomite aquifers - 500-2500m depth - beneath the city of Beijing; the aquifers occur near the top of the Sinian basement which forms a 3.5 km deep and about 50 km wide depression - Beijing Graben -. The acquifers have been explored by 45 deep wells covering an area of about 100 km2; one aquifer is probably coherent throughout the whole prospect. The transmissivity of the acquifers is high - about 150 to 300 darcymeters -. About 4 x 10 6 m3 of water is presently abstracted per year. Since no re-injection takes place, there is a continuous pressure drop in acquifers - total drop up to 2 to 3 bars over the last 10 yrs). The warm water is being used in a few industrial and heating pilot schemes. Analysis of simple reservoir models has shown that the energy potential of the resource is limited - about 2.5 to 10MW -thermal-/Km2 for a 25 yr period - but pressure drops is also limited. If geothermal fluids are to be used in future heating schemes, the annual heat load curve and economic considerations indicate that boosting by existing boilers has to be considered. Overall heating costs are compared with present-day heating costs using coal. The reservoir could also be used for reinjection of waste heat during the summer, thus increasing its production potential for space heating in the winter.

Presenta gráfs.

CHINA; ENERGIA GEOTERMICA; EXPLORACION GEOTERMICA; INGENIERIA DE RESERVORIO; ASPECTOS GEOLOGICOS;