| This paper is concerned about exploration and evaluation on the two geothermalwells (YR-6and YR-3) in San Lihe area of Yanqing County，Beijing. The researcharea is located in the north of Yanqing County with complicated Geothermal andgeological conditions. The strata of the research area are Quaternary, Cretaceous,Jurassic and Wumishan Formation of Jixian System. The cap rocks of geothermalreservoir consist of Quaternary System, Cretaceous System and Jurassic System. Thestrata of Wumishan Formation of Jixian System are the main geothermal reservoir inthe research area. The research area belongs to low temperature geothermal field.The geothermal gradient of the cap rocks of geothermal reservoir in the research areais2.15℃/100m, while the geothermal gradient of geothermal reservoir is1.00℃/100m. The water yield of Wumishan Formation of Jixian System, which is the maingeothermal reservoir stratum in the research area, is100m3/h～120m3/h with watertemperature of66～70℃. When the stable water yield attains100m3/h with thewater temperature of70℃, the total heat discharging in future100years is expectedto2.18×1012kcal, and the available heat per unit area is3.53×106kcal/m2, and theinfluence area is6.18×105m2, and the protection distance of the geothermal wells is886.00m. The tail water will be all recharged without any waste. The results basedon the water quality test show that the type of heat mineral water in the research areais fluoride and metasilicate thermal water. The mineral water is unfavorable to drinkdirectly, but it is suitable for bathing, health care, rehabilitation, entertainment, andleisure etc.This is the first time to carry out the geothermal exploration and evaluation in SanLihe area of Yanqing County of Beijing. The research results enhanced the study andthe knowledge level in the research area, and it also accumulated data to achieve theresearch on geology and geothermy in this area. The research results are mainlyapplied to the areas of geothermal resource exploration, and have referencesignificance for the same work in Yanqing County. |
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