Analysis of geological characteristics and metallogenic mechanism of geothermal resources of Fan County,Henan Province
The geothermal resource area in Fan County,Henan Province is an important exploration area for the"14th Five-Year Plan"geothermal resource prospecting breakthrough strategic action in Henan Prov-ince.This area is characterized by a wide distribution of high water temperature,large water inflow,and high recharge rate.Through the analysis of the geological background and geothermal conditions of the Fan County,the recharge,runoff and drainage paths of geothermal fields,the occurrence conditions and metallo-genic mechanism of geothermal fluids in geothermal reservoirs were investigated.The results show that the geothermal resources of Fan County are located in the geothermal field of the buried-uplift sandstone-karst binary geothermal reservoir in the sedimentary basin.The O-∈ karst geothermal fluid is located in a deep cir-culation-weak open environment.The sedimentary basin-type geothermal field has"four-elements"metallo-genic mechanism:one is the basement uplift area(uplift area),the binary is on both sides of the structural influence zone,the ternary is the cover layer of Cenozoic with a buried depth of 1 200 to 1 500 m,and the quaternary is the basement lithology of carbonate rock(limestone,dolomite,etc.).
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