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基于美国沙漠峰地热田地质背景,构建引入围岩的平行多裂隙概念模型对采热过程进行数值模拟研究,结果表明此模型开采沙漠峰热储层是可行的.当系统的循环流量为100kg/s,换热单元体厚度为40 m时,热开采前20年产出温度为210℃,电功率为7.6 MW,50年内产出温度仅下降6.2%,产出温度和产能均符合EGS商业开发的要求.热储激发程度与产出温度、热储寿命呈正相关,并对下伏层围岩热开采呈正效应.裂隙宽度对产出温度影响不大.流量与产出温度及热储寿命呈负相关.
Based on the geothermal background of desert geothermal field in the United States, a conceptual model of parallel multi-fracture surrounding rock is constructed to simulate the heat recovery process. The results show that it is feasible to mine the peak and warm reservoirs in the desert. When the circulating flow of the system is 100kg / s. When the thickness of heat exchanging unit is 40 m, the output temperature is 210 ℃ and the electric power is 7.6 MW in the first 20 years before thermal exploitation, and the output temperature in only 50 years decreases only 6.2%. The output temperature and capacity all conform to the commercial development of EGS .The degree of thermal storage excitation is positively correlated with the output temperature and the thermal storage life, and it has a positive effect on the thermal recovery of the surrounding rocks in the underlying layer.The width of the fracture has little effect on the output temperature.The flow and output temperature and the thermal storage life are negative Related.