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Granite thermal reservoirs in Lingshui area of Hainan Island and their significance to geothermal resources,China

Energy Geoscience 2023年第4期4卷 159-170页

作者： Xiaorui Yun Ying Zhang Dingyong Liang Yanming Qu Haifeng Chen Petroleum Exploration&Production Research Institute SINOPECBeijing100083China Geological Comprehensive Survey Institute of Hainan HaikouHainan570206China No.3 Bureau of China Metallurgical Geology Bureau TaiyuanShanxi030000China No.313 Geological Team Bureau of Geology and Exploration of AnhuiLu'anAnhui237010China

Hainan Island located at the southernmost tip of the continental crust of the South China Plate,has high terrestrial heat-flow values,widely-distributed hot springs,and rich geothermal *** researches on the origin and potentials of geothermal resources can promote Hainan Island's development into a clean energy *** determine the geological conditions for the formation of geothermal resources in southern Hainan Island,we collected core samples of granites from the baocheng batholith in southern Hainan Island and conducted systematic analysis in respect of petrology,geochronology,geochemistry,and petrophysical *** results of this study are as *** baocheng batholith in the southern Hainan Island has a crystallization age of 98.42±0.56 Ma,making it the product of magmatism in the early stage of the Late *** mainly consists of high-K calc-alkaline granites,which were intruded by intermediate-to-mafic *** baocheng batholith has a high radioactive heat generation rate of 2.712-6.843μW/m^(3),with an average of 3.846μW/m^(3),a radioactive heat-flow value of 30.768 μW/m^(2)and a heat-flow contribution rate of 38.95%-43.95%.As shown by the results of their thermophysical property analysis,the granites have high thermal conductivity and can serve as highquality geothermal *** combination with previous geological and geophysical data,the geothermal model of the Lingshui area was established in this *** deep structure indicates the presence of high-conductivity and low-resistivity layers in the basement of the baocheng *** can be inferred thereby that asthenospheric upwelling may occur and that there exist two magma vents at depth in the ***,magmatic heat at depth and granites with high radioactive heat generation rate serve as the main heat sources in the Lingshui area.

关键词： Hainan Island Geothermal energy baocheng batholith Granite Radioactive heat flow Thermal conductivity

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