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采用数学统计法和对井功率法两种地热供暖潜力的估算方法,分别计算北京市10个地热田的地热资源量,用来重新估算北京市地热能的供暖潜力。估算结果表明:在抽灌井间距为300 m的条件下,对井抽灌系统的热影响范围为36×10~4m~2,每平方公里热田范围内可容纳的地热井抽灌系统约2.78个;在地热水100%回灌条件下,采用对井抽灌方式,抽灌井间距为300 m时,利用统计法计算的北京市10个地热田(面积为2 760 km~2)的可供暖潜力为2.75×10~8m~2,利用对井功率法计算的北京市地热供暖潜力为3.01×10~8m~2;采用地热梯级利用,结合其他辅助清洁能源调峰方式,全市热田面积内可供暖面积为8.60×10~8m~2。采用对井系统供暖可大大提高布井密度,有助于推进北京甚至全国范围内地热供暖的发展。
Using the methods of mathematical statistics and well power method to estimate the potential of geothermal heating, the geothermal resources of 10 geothermal fields in Beijing were calculated respectively to re-evaluate the geothermal energy potential in Beijing. The estimation results show that the thermal impact range of well pumping system is 36 × 10 ~ 4m ~ 2 under the conditions of pumping and well spacing of 300 m, and the geothermal well pumping system per square kilometer of thermal field 2.78; under the conditions of 100% recharge of geothermal water, 10 geothermal fields in Beijing (area of 2 760 km ~ 2) were calculated by statistical method when the pumping method was used for well pumping and the interval between pumping wells and wells was 300 m. The potential for heating is 2.75 × 10 ~ 8m ~ 2. The geothermal heating potential in Beijing calculated by the well power method is 3.01 × 10 ~ 8m ~ 2. Using geothermal cascade utilization, combined with other auxiliary clean energy peak shaving methods, The heating area in the field is 8.60 × 10 ~ 8m ~ 2. The use of well system heating can greatly improve the well density, contribute to the promotion of geothermal heating in Beijing and even the development of the country.