|
This study as the research object Conghua Liang Town, Guangdong Province, from low-temperature geothermal fields. Pumping test by collecting geothermal field geothermal exploration data and previous research report, to carry out field geochemical and geophysical survey, drilling, on the basis of geothermal Tian regional geological conditions, hydrology geological conditions analysis, the evaluation of geothermal reserves and ground heat fluid quality to study underground hot water flow model, and gives the thermal anomaly area and development programs. Widely from breaking through the region, is the main fault of this area, belonging to control heat, thermal structure. It plays the role of communication deep heat, heat deep heat source for the formation of thermal mineral water is a prerequisite for the formation of thermal mineral water in this area. The District, North West to tensile fracture staging flocks when they are with the North East to the main fault intersection, mutual cutting, so rock crusher, fractured a fault or fracture, along the main fault upward migration and aggregation of deep thermal fluid have good thermal mineral water migration pathways and occupied space. Quaternary flood alluvium and granite hot caprock. Spa area has 10 thermal wells, water temperature 36-54 ° C, is a colorless, odorless, transparent alkaline water, pH value of 7.1-7.4, water quality types HCO , 3 -K · Na type, salinity of 0.24-0.37 g / L. Underground hot water rich in F of SiO 2 , and Rn, the content for the 8.5mg / L ,30-85 mg / L, 4.7 - 53 1.4 mohair / L, as a weak to moderate radioactive water. Spa area calculate the permeability coefficient of 0.569 3 .078 m / d, an average of 1.96 m / d, an aquitard - permeable layer, rich water is better. Radius of influence and cut coefficient quite different in different borehole description of the fault structure with an aqueous the uneven water conductivity, irregular modes of occurrence of underground hot water. Evaluation CD grade reserves Total for 6617 m 3 / d, the thermal energy of geothermal fields 6.64MW, are small in low-temperature geothermal fields. Consider the current actual water consumption for 3000-3500 m 3 / d, while the C-class reserves of 4015 m 3 / d increase with the amount of water, there will be hot mineral The water shortage situation, and should therefore be to carry out the exploration and development of new production wells. Geophysical exploration work by the magnetic method, radon measurement method, the effective combination of the three geophysical Transient Electromagnetic Method, precision magnetic survey delineated three magnetic anomalies with radon measurement method delineated eight anomalous area of ??high value the transient electromagnetic delineated 12 high and low resistance anomaly zone, the region preliminary delineation of six fault location. By shallow drilling, proven granite bedrock fracture zones, temperature abnormal area in the the pond material meters Po area delineated ground temperature, abnormal area of ??approximately 0.24 km 2 , 0.18 km 2 .
|