Abstract: The studied area is a 300-1 600 m deep, low temperature(25-67 ℃) geothermal system in porous deposit in Kaifeng area. Based on the data of 50 geothermal wells with depths ranging from 440-1 580 m existing in the area, the geothermal system is divided into six sub heat-reservoirs. A rational exploitation engineering scheme was used to remedy the field well distribution. Under the designed scheme, the increasing ranging of geothermal water yield from actual field single well can be increased 500-600 m³/d compared with the designed single well (80 m designed water level drawdown) in sub heat-reservoirs, except in the deepest sub heat-reservoir (14 m³/d). The geothermal water output (43 224.0 m³/d) from 49 efficient actual field wells can be increased to 150 744.0 m³/d from 110 wells. During the simulated geothermal water exploitation period (20 years), water temperatures barely change in the heat-reservoir, which means the geothermal water can be exploited sustainably within 20 years.

Key words: low temperature geothermal system, exploitation engineering scheme, Kaifeng area