| Abstract |
Geothermal development have been carried out for almost 10 years, and there are 9 geothermal wells in Wugong country, Shaanxi province. However, for a long time, this area has been limited to basin-level macro-study in plane, and lacks of microscopic quantitative characterization of reservoir physical properties and temperature distribution in vertical direction.In order to clarify the potential of thermal resources in the study area, this paper systematically combs and studies the fracture structure, thermal reservoir, basement distribution and heat source characteristics based on well WG3. Microscopically, geophysical logging and pumping test are used as basic methods to delineate the potential of single well geothermal resources.The study shows that the thermal reservoir porosity of Neogene Lantian-Bahe Formation in WG3 well is 18.55-42.69%, permeability is 9.56-957.96 mD, the measured temperature of roof is 75.88℃, the measured temperature of floor is 94.45℃, and the average temperature is 85.17 ℃ .The porosity of thermal reservoir of Neogene Gaoling group is 2.13-31.03%, permeability is 0.01-310.321 mD, measured temperature is 94.45℃, floor temperature of 116.63℃ and average temperature of 105.54℃. When the static liquid level of geothermal well is + 11.5m and the large drop distance is 41m, the outlet water temperature is 102℃ , 142m3/h, and the maximum outlet water volume is 188m3/h at 71.75m. According to the calculation, the protection radius of rights and interests of single well is 3668.90 m under the condition of 100-year exploitation of this geothermal well. The systematic evaluation of geothermal resources in WG3 well can provide geological and engineering support for the development and construction of the first "smokeless city" in Shaanxi Province in the future. |