| Title | Assessment of the Beijing Geothermal Prospect (P.R. China) |
|---|---|
| Authors | Hochstein, M.P., McKibbin, R. and Yang Yutang |
| Year | 1984 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | Warm water (40 to is produced from two deep dolomite aquifers depth) beneath the city of Beijing; the aquifers occur near the top of the Sinian basement which forms a 3.5 deep and about 50 wide depression (Beijing Graben). The aquifers have been explored by 45 deep wells covering an area of about LOO one aquifer is probably coherent throughout the whole prospect. The transmissivity of the aquifers is high (about 150 to 300 darcymeters). About 4 x of water is presently abstracted per year. Since no re-injection takes place, there is a continuous pressure drop in the aquifers (total drop up to 2 to 3 bars over the last 10 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 10 for a 25 yr period) but pressure drops can be stablised by reinjection; natural recharge 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 comparable with present-day heating costs using coal. The reservoir could also be used for injection of waste heat during the summer, thus increasing its production potential for space heating in the winter. |