Abstract：In recent years, geothermal resources were explored in the structural fissures of metamorphic rocks of Taishan Group in the northern Pingyin County of Shandong Province. It is of great significance to analyze and study the characteristics of geothermal field, terrestrial heat flow and radiogenic heat production rate of rocks, for predicting and evaluating the formation potential of geothermal resources. Based on the borehole temperature data and the test data of water and rock samples, the authors systematically analyzed the characteristics of the geothermal field in the study area, and calculated the terrestrial heat flow and the radiogenic heat production rate of the metamorphic rocks of Taishan Group. Besides, the silica heat flow in the study area was calculated based on to the SiO2 content in the groundwater. The research show that average geothermal gradient of the overlying strata in the study area was 2.07 ℃/100 m, and the average geothermal gradient of the metamorphic rocks of Taishan Group was 2.18 ℃/100 m, with the lateral distribution of low in the west and high in the east, and the vertical distribution of increasing with depth. The geothermal heat flow value of the metamorphic rocks of Taishan Group in the study area is lower than the average geothermal heat flow in China mainland, indicating a low heat flow background. The silicon heat flow value in the study area is slightly higher than the measured borehole data. The radiogenic heat production rate of Taishan Group is low, and Taishan Group belongs to low heat-producing rock mass. Comprehensive analysis shows that the geothermal field distribution is mainly affected by regional geological structures and stratigraphic structures. The geothermal distribution is generally within the normal range, but it has a relatively low heat flow background in the study area. The heat source is mainly conductive heat generation, followed by rock radioactive heat generation. The research results could provide some basic data and scientific basis for future research on geothermal geological conditions in the study area and subsequent exploration and development work.
卢兆群. 山东平阴县北部地温场特征及大地热流值[J]. 中国地质调查, 2024, 11(2): 28-36.
LU Zhaoqun. Characteristics of geothermal field and terrestrial heat flow in the northern Pingyin County of Shandong Province. , 2024, 11(2): 28-36.
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