Citation: | LIU Yuanqing, ZHOU Le, Lü Lin, LI Wei, WANG Xinfeng, DENG Qijun, SONG Mian, ZHENG Yidi, MA Xuemei. Geothermal geological characteristics and genesis of hot water in the central mountain area of Shandong Province[J]. Geological Bulletin of China, 2020, 39(12): 1908-1918. |
There are hot water resources distributed in Laiwu Depression, Dongping Uplift and Xinfushan Uplift of the fifth grade structural unit in the central mountain area of Shandong Province.It is found that the burial depth of hot water, the type of thermal reservoir and the genetic mechanism are varied in different structural positions.Based on the temperature measurement data of typical geothermal wells, the hydrochemical composition and isotope comparative analysis of hot water with other types of water, the authors studied and calculated the geothermal geological characteristics, hot water genesis and thermal storage temperature value.The results show that the precipitation is the source of hot water supply.The chemical types of the hot water in this area are SO4-Na·Ca and SO4·R-Na·Ca(R standing for Cl or HCO3), with low δ 18O and δ D values compared with other waters.The calculated temperature value of each heat storage is lower than 100℃, suggesting a medium low temperature heat storage.The hot water is immature water, which indicates that the water rock interaction of geothermal water has not reached the ion equilibrium state, the dissolution is still in progress, or the hot water is mixed by exogenous cold water.The Lengjiazhuang geothermal system in the basin belongs to the heat conduction type, and the Anjiazhuang and Qiaogou geothermal systems in the basin margin uplifts belong to the thermal convection type.The research results provide a theoretical basis for the development of geothermal water resources in the central mountain area of Shandong Province.
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Geothermal zoning map (a), structural geological map (b) and lithologic histogram (c) in the mountainous area of central Shandong Province
The isobath map of Moho in Shandong Province
The temperature measurement curves of different geothermal wells in the study area
The Scholler diagrams of different geothermal wells and surrounding groundwater in the study area
The Piper diagrams of different geothermal wells and surrounding groundwater in the study area
Triangular diagram of geothermal water in the study area
Langlier-Ludwig diagram in the study area
Scatter diagram between δD and δ18O in the study area
The profile of geothermal enrichment model in Laiwu Basin and Xinfushan Uplift
The profile of geothermal enrichment model inthe contact zone between Dawenkou Basin and Dongping Uplift