Characteristics and potential evaluation of geothermal resources in Anhui of Yangtze River Economic Zone
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摘要:
研究目的 安徽长江经济带地热资源储量丰富，未来开发利用前景好，对该区域进行地热资源评价可为安徽省能源结构优化及地热资源可持续开发利用提供科学依据。
研究方法 在分析研究区地质构造、地层岩性、地热流体水化学类型等地质与水文地质条件的基础上，揭示了安徽长江经济带地热资源概况及分布特征，探讨了隆起山地对流型和沉积盆地传导型地热资源的赋存特征，并对其储量及开发利用潜力进行评价。
研究结果 安徽长江经济带地热资源热储主要赋存在巢湖—和县基岩隆起区、大别山隆起区、沿江基岩隆起区、江南隆起等隆起山地及定远断陷盆地、肥东断陷盆地、霍山—九井盆地、庐枞断陷盆地、安庆断陷盆地、宣城断陷盆地等沉积盆地。前者隆起区热储类型为带状，岩性以断裂破碎带中花岗岩为主，后者断陷盆地热储类型为层状及层状兼带状，岩性以砂岩和碳酸盐岩为主。带内热储主要为偏硅酸·氟热矿水，隆起山地型地热流体水化学类型主要为SO4、HCO3型水，沉积盆地型地热流体水化学类型主要为HCO3型水。通过潜力评价可知，隆起山地型地热资源潜力较小，且处于开发利用状态的地热田基本处于超采状态；沉积盆地型地热资源潜力相对较大，其中潜力大、中和小的盆地分别有4处、6处和10处。
结论 安徽长江经济带区域内地热资源潜力分布不均，地热资源需要分区规划利用，并且需要考虑高氟、高矿化度热矿水利用造成的地表水环境污染。
Abstract:This paper is the result of geothermal resource survey engineering.
Objective The geothermal resources in Anhui of Yangtze River Economic Zone are abundant, which has good prospects for city development and utilization. The evalution of geothermal resources can provide a scientific basis for the optimization of energy structure, sustainable development and utilization of geothermal resources in this area.
Methods Through analyzing the geological and hydrogeological conditions, e.g., geological structure, formation lithology, and hydrochemical composition of geothermal fluids, this study reveals the distribution characteristics of geothermal resources in Anhui of Yangtze River Econmic Zone, discusses the storage feature of geothermal resources in uplift mountain convective area and conductive-type sedimentary basins, and evaluates its reserves, development, and utilization potential.
Results The geothermal resources mainly occurred in the uplift mountain including the Chaohu-Hexian bedrock, the Dabie mountain, the bedrock along the Yangtze River, the Jiangnan, and at the sedimentary basin including the Dingyuan, the Feidong, the Huoshan-Jijing, the Luzong, the Anqing, and the Xuancheng, etc. The thermal storage of the former uplift mountain is zonal-type, dominated by granite in the fractured zone of the area. The thermal storage of the latter sedimentary basin is layered and layered-zonal type, dominated by lithologic sandstones and carbonate rocks. The thermal storage is mainly metasilicic acid-fluorine thermal mineral water. The hydrochemical type of the geothermal fluid in uplift-mountain type are mainly SO4 and HCO3 type. The hydrochemical type of geothermal fluid in sedimentary-basin type is mainly HCO3 type. According to the potential evaluation results, the utilization potential of geothermal resources in uplift mountain type is relatively small and is basically in over-exploitation situation while that in sedimentary-basin type is relatively large. There are 4, 6, and 10 basins with big, medium, and small potential in sedimentary-basin type geothermal resources.
Conclusions The potential distribution of geothermal resources in Anhui of Yangtze River Economic Zone is uneven, and the geothermal resources need to be planned and utilized in different zones. It is necessary to consider the surface water pollution caused by the utilization of high fluoride and high salinity hot mineral water.
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表 1 安徽长江经济带地热流体水化学成分
Table 1. Hydrochemical composition of geothermal fluids in Anhui of Yangtze River Economic Zone
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表 2 安徽长江经济带地热田稳定同位素(δD和δ18O)测定值
Table 2. Stable isotope (δD and δ18O) values of geothermal fields in Anhui of Yangtze River Economic Zone
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表 3 盆地地热流体资源量估算参数
Table 3. Estimation parameters of geothermal fluid resources in the basin
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表 4 部分盆地内地热流体资源估算
Table 4. Estimation of thermal fluid resources in the interior of the part of the basins
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表 5 部分隆起山地地热流体资源估算
Table 5. Estimates of geothermal fluid resources in the part of uplift mountains
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表 6 大别山隆起带和巢湖—和县隆起带地热资源潜力
Table 6. Geothermal resource potential of Dabie Mountain uplift and Chaohu-Hexian uplift
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