Optimization of Soil Radon Quantitative Testing Methods and Its Application in Identification of Medium-Low Temperature Convective Geothermal Systems
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摘要: 为了指示地热勘察空白区内地热水的分布，经系统试验阐明了土壤氡含量测试结果与采样深度、测量时间、土壤孔隙度、土壤湿度等重要影响因素的关系，确定了最佳的土壤测试条件，优化了传统土壤氡测量方法.在此基础上，选择山西忻州盆地内的地热勘查空白区为典型研究区，基于优化后的土壤氡测量方法识别了区内控制地热水升流的主要导水断裂，并辅以浅层地下水温测量及其水文地球化学研究，查明了区内水热型地热的分布规律.研究成果有望推广应用于受断裂控制的中低温对流型地热系统的勘查实践.Abstract: Soil radon measurement is one of the important geochemical exploration methods to investigate concealed fracture, and also an effective means to identify hydrothermal geothermal systems. In this paper it clarified the relationship between the test results of soil radon content and sampling depth, measurement time, soil porosity, soil humidity and optimizes the traditional soil radon measurement method. On this basis, choose the geothermal exploration in Shanxi Xinzhou Basin as a typical research area, based on the optimization of soil radon measurement method to identify the control of geothermal water flow main water fracture, supplemented by shallow groundwater temperature measurement and hydrogeochemical research, find out the distribution of hydrothermal geothermal type in the area. The results of this study are expected to be applied to the exploration practice of medium-low temperature convective geothermal system controlled by fracture.
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图 1 忻州盆地地质简图及地热区分布（改自张梦昭等，2023）
Fig. 1. Geologic map and geothermal field distribution of the Xinzhou Basin (after Zhang et al., 2023)
图 3 土壤氡含量测试结果对相关影响因素的响应规律
Fig. 3. Response patterns of soil radon content test results to related influencing factors
图 4 研究区土壤氡测量点及剖面位置图
Fig. 4. Soil radon measurement point and line layout in the study area
图 5 研究区浅井水温测量及水样采集点分布
Fig. 5. Measurement of water temperature and distribution of water samples in the study area
图 11 研究区浅层地下水温度等值线
Fig. 11. The contour plot of the shallow groundwater temperature in the study area
图 12 南岗-李三泉剖面（A-A'）浅层地下水中各地热特征组分含量变化趋势
Fig. 12. The change trends of thermal characteristic components in the shallow groundwater of Nangang-Lisanquan Section(A-A')
表 1 研究区土壤氡含量范围划分依据
Table 1. Basis for the range division of soil radon content in the study area
正常值 偏高值 高值 异常值 划分标准 300<Rn<C+σ C+σ<Rn<C+2σ C+2σ<Rn<C+3σ C+3σ<Rn 下限(Bq/m3) 300 10 070 13 727 17 385 
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表 2 南岗-李三泉剖面（A-A'）浅层地下水样中冷水端元的混合比（%）
Table 2. Mixing ratio of cold water element in shallow groundwater sample of section (A-A')
ID Na B Cl F 南岗村 CW01 93.96 90.53 93.26 99.65 CW02 93.12 74.13 97.65 97.77 CW03 90.73 78.52 92.84 98.59 CW04 93.06 92.15 97.47 96.95 CW05 92.64 93.53 97.17 99.18 Average 92.70 85.77 95.68 98.43 上院村 CW06 93.78 88.45 98.43 98.47 CW07 93.96 91.45 98.98 99.53 CW08 94.26 92.61 94.76 99.65 CW09 95.57 90.07 98.19 98.47 Average 94.39 90.65 97.59 99.03 解村 CW10 93.78 94.69 98.43 99.18 CW11 95.63 89.61 97.89 99.30 Average 94.71 92.15 98.16 99.24 圪妥村 CW12 93.06 93.76 96.45 99.77 CW13 91.93 95.84 96.81 100.00 CW14 90.01 92.61 94.58 99.41 CW15 89.95 90.76 94.40 98.59 Average 91.24 93.24 95.56 99.44 中三泉村 CW16 97.61 97.69 98.74 99.18 CW17 99.04 98.61 98.98 99.65 CW18 94.14 97.46 / 99.53 Average 96.93 97.92 98.86 99.45 李三泉村 CW19 96.35 96.07 98.80 99.65
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