成都市浅层地热能资源调查与评价

Investigation and evaluation of shallow geothermal energy resources in key areas of Chengdu

关键词:  浅层地热能  现场试验  适宜性分区  资源评价  成都

Key words:  Shallow geothermal energy  field test  fuitability zoning  fesource evaluation  Chengdu

摘要:

在“双碳”目标背景下，浅层地热能作为节能环保能源，其勘探开发及利用力度亟须加强。基于现场热响应测试、抽水及回灌试验以及岩土体热物性测试，获取水文地质和热物性参数，采用层次分析法开展成都市浅层地热能适宜性评价，估算浅层地热能热容量、换热功率、资源潜力及环境效益。实测成都市研究区200 m以浅平均地层温度在18.59~19.76℃，地层平均导热率介于1.89~3.12 W/m·℃。成都市浅层地热能适宜采用地下水和地埋管地源热泵方式开发，地下水地源热泵方式适宜区面积占16.36%，较适宜区面积占19.72%，不适宜面积占63.92%；除原芒硝矿采空区域外，研究区均适宜及较适宜地埋管地源热泵方式开发。浅层地热能夏季制冷换热功率总量为1.19×10⁷ kW，可制冷面积达1.98×10⁸ m²；冬季供暖换热功率总量为1.48×10⁷ kW，可供暖面积达1.57×10⁸ m²。据估算，成都市开发浅层地热能每年可节省标准煤169万吨，减排各类废气污染约425万吨，节能减排效果显著。

Abstract:

In order to achieve carbon peaking and carbon neutrality, shallow geothermal energy as an energy-saving and environmental-friendly energy, its exploration and utilization should be strengthened urgently. Based on the field thermal response test and the pumping and recharging tests, hydrogeological and thermal physical parameters were obtained, and the suitability evaluation of shallow geothermal energy in Chengdu was carried out by using the analytic hierarchy process. The estimated evaluation of shallow geothermal energy heat capacity, heat exchange power and resource potential were obtained. The measured average formation temperature above 200 m in the study area of Chengdu is 18.59-19.76℃, and the average thermal conductivity of the formation is between 1.89-3.12 W/m·℃. The shallow geothermal energy in Chengdu is suitable for the development of groundwater and ground source heat pump system. The area of suitable area accounts for 16.36%, the relatively suitable area accounts for 19.72%, and the unsuitable area accounts for 63.92. Except for the abandoned Mangniu Mine area, all areas are suitable and relatively suitable for the development of ground source heat pump system. The total cooling power of shallow geothermal energy in summer is 1.19×10⁷ kW, and the cooling area is 1.98×10⁸ m². The total heating power in winter is 1.48×10⁷ kW, and the heating area is 1.57×10⁸ m². It is estimated that the development of shallow geothermal energy in Chengdu can save 1.69 million tons of standard coal per year, and reduce the emission of various types of waste gas pollution by about 4.25 million tons. The effect of energy saving and emission reduction is remarkable.