Application of geothermal measurement in the geothermal exploration
WANG Ming-Peng1,2(), YANG Jun-Song1,2, LIU Yan-Hua1,2
1. Hydrogeological and Marine Geological Exploration Institute of Jiangsu Province, Huai'an 223005, China 2. Hydrogeological and Engineering Geological Investigation Institute of Jiangsu Province, Huai'an 223005, China
Geothermal measurement is the most direct method to study the distribution of geothermal field. The intensity and distribution of geothermal heat sources directly affect the distribution of the soil temperature field in the surface layer of the earth's crust, especially the existence of thermal reservoirs and thermal transport channels can cause anomalies in the distribution of the geothermal field. Geothermal measurements were carried out in 16 civil wells and 32 boreholes in the study area to analyze the distribution of geothermal field and the pattern of underground hot water activity, and the results were obvious.The results show that the geothermal field at shallow depths is laterally consistent with that at deep depths, with the temperature tending to increase toward the northeastern corner of the study area, and that the anomalous geothermal areas are distributed as a NNE-oriented strip, with a width of about 700 m, which is consistent with the NNE-oriented faults. The highest geothermal point is located at the intersection of the NW and NNE-trending faults.. The vertical geothermal distributions in the study area are distinct. The geothermal water is limited to a narrow area. The low-temperature groundwater inflows into the tectonic faults and karsts, with volumes controlled with the development degrees of them, leading to an abnormal geothermal gradient. This anomaly also indicated that the geothermal water in the Lasozi Mountain area is mainly stored in fissures and karst caves of limy dolomite or breccia rocks, with fissures and caves providing good pathways for the geothermal water to flow. The geothermal measurement method has traced the range of geothermal anomalies in the study area, which provides an important basis for further geothermal investigation.
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WANG Ming-Peng, YANG Jun-Song, LIU Yan-Hua. Application of geothermal measurement in the geothermal exploration. Geophysical and Geochemical Exploration, 2022, 46(4): 838-844.
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