Abstract:The karst geothermal reservoir in buried uplifts of basins is one of the main reservoirs for space heating in China, which is characterized by wide distribution area, high water temperature and large amount of production. It is an important renewable heat source for clean heating in North China. Taking the karst geothermal field in Heze buried uplift as an example, this paper reveals the recharge source, migration path and enrichment mechanism of karst geothermal water in the geothermal field through systematic analysis of geological structure, karst development characteristics, isotope and hydrogeochemical characteristics, spatial distribution law of geotemperature field and geothermal water dynamic field. The geothermal water comes from the infiltration of atmospheric precipitation in the bedrock mountain area of Liangshan in the northeast and Jiaxiang in the east, and mainly accumulates in the compound of interlayered karst and fault zone. According to the characteristics of heat sources and their transfer and accumulation revealed by the spatial distribution of geo- temperature field, the four- sources heat accumulation mechanism is proposed. The first source is the thermal accumulation of blanket shaped terrestrial heat flow conduction; the second source is the thermal accumulation of the high thermal conductivity diffluence in the uplift area; the third source is the belt shaped convective thermal accumulation in the deep fault zone and the contact zone between the intrusive and soluble rocks; and the fourth source is the conductive and convective thermal accumulation through the deep groundwater circulation. Based on the mechanism of thermal accumulation and geothermal water enrichment, together with the controlling elements such as the water sources, heat sources, and the spatial occurrence of geothermal water enrichment reservoir, the metallogenic mode of the karst reservoirs in the buried uplift geothermal fields of the basins was determined to be weakly open, convective- conductive, belted- layered type. This metallogenic mode reveals the renewable capacity of the hot water sources and their enrichment, the heat sources and their transfer and accumulation, and the spatial occurrence regularity of the reservoirs.