The geothermal fluid of the ZYDR3 geothermal well in Zhangye-Minle Basin is rich in water-soluble gases,among this the content of helium gas accounts for 1.198％of water-soluble gas.Through the analysis and test of the helium isotopic of the geothermal fluid in the ZYDR3 geothermal well,the value R(4.40 × 10-8)of 3He/4He is much smaller than the value Ra(1.40 × 10-6)of atmospheric 3He/4He,it is suggesting that the helium in the geothermal fluid in ZYDR3 geothermal well is mainly shell helium,mixed with a trace amount of mantle-derived helium.The thermal conductivity and well temperature gradient of the thermal reservoir are analyzed and calculated in this paper,and the estimated terrestrial heat flow value is 69.23 mW/m2,which is slightly higher than the average heat flow value of 61.50 mW/m2 in mainland China,which indicates that this region has a good heat flow state.The analysis shows that the main terrestrial heat flow is shell source heat flow accounting for about 85.50％,and a small amount of mantle derived heat flow accounted for about 14.50％.The research method enriches the theory of geothermal system and at the same time provides some theoretical support for the development and utilization of geothermal resources in this area.
helium isotoperatio of crust and mantle heat flowreservoir temperaturegeothermal gradientZhangye-Minle Basin
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