| Compared with the traditional energy, geothermal energy has the advantage of environmental protection, clean and renewable. Development and utilization of geothermal resources, is to achieve energy conservation and emissions reduction, environmental protection. At present, the development of geothermal energy is mainly concentrated in the north of China, the Guanzhong Basin and coastal areas of Guangdong. The development and utilization of geothermal resources in Heilongjiang Province is in the early stage and focused in the Lindian. Mountain Dadingzi situated in the northeastern part of Harbin, is no system to carry out the geothermal resources, evaluation, therefore it is a great significance to carry out the research work in this region.Previous geothermal exploration is mainlu concentrated in the central sag of Lindian,Daqing and its surrounding areas in the Songnen Basin. And the preliminary scope of geothermal field is delineated, and the east boundary is located in Suihua-Zhaodong. The research work in Mountain Dadingzi found the low temperature geothermal field. It pushed the existing geothermal field to east more than 40 kilometers. The low emperature geothermal field is the(Ⅱ)-Type 1, thermal reservoir is cretaceous Quantou Group Two, Three, Four parts of aquifer sandstone; the cap rock is cretaceous Nenjiang, Yaojia and Qiangshankou Group; heat is derived form the mantle source heat. The fluorine content of geothermal water is 18.75 mg/L. The fluorine water owns the medical value on physical therapy, bathing and heating.Previous research results show that the geothermal field in the Songnen Plain has "Three Highs" characteristics, namely the high heat flux density, the high geothermal gradient and the high ground temperature. The average fetothermal gradient is 3.7 ℃ / 100 m, belong to high geothermal gradient basin as a whole. But its most pitching in northern area and west slope area belongs to middle and low geothermal gradient zone, geothermal gradient is less than 3.7 ℃ / 100 m; the central depression area is higher and northeast and southeast uplift area is highest. From the research data, the average geothermal gradient in this area is only 2.22 ℃ / 100 m, lower than the average regional geothermal gradient.The study area in the eastern part of the Songnen Basin, years of average rainfall is 516.1 mm, and parts of the precipitation in the basin edge infiltration recharge groundwater at the same time, the heat in the rock mass is washed away with cold groundwater. Resulting in the geothermal gradient in the area is lower than the average. This suggests that in the east Songnen Basin, the cretaceous groundwater recharge areas, affected by groundwater low geothermal gradient and geothermal field of groundwater carry heat accumulation in the central depression area.This article based on Heat Resources Exploration Projects in Mountain Dadingzi, Harbin, Heilongjiang Province, and collected research area geology, hydrology geology and geophysical data. Systematically analyzed the geothermal heat reservoir and heat source, the channel, the characteristics of the geothermal fluid. Results indicates that geothermal resources of thermal reservoir is 1.52×1012kcal, and there has 2.28×1011kcal in thermal water. Single well rational exploitation quantity is 802m3/d,accumulative total recoverable heat is 9.07×1015J in 100 years. Besides, according to the temperature and water quality characteristics of geothermal water, the geothermal can be used for geothermal heating and bath recuperation. |
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