Numerical Simulation of Buried Hill Geothermal Resources Exploitation in Hejian Area
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摘要: 古潜山地热资源具备岩溶孔隙发育程度高、热储面积厚度大、地热水储量大的优点。冀中坳陷内古潜山分布密集且地热资源丰富, 河间潜山位于冀中坳陷饶阳凹陷中东部, 具有良好的地热地质条件, 开发潜力巨大。本文基于河间潜山及其周缘地区测井资料、岩石热物性并进行了计算, 发现其地温梯度为29.8 ℃/km到44.5 ℃/km之间, 平均值为40.7 ℃/km。大地热流值介于64.8～80.6 mW/m2之间, 平均值为73.4 mW/m2。通过水热耦合模拟方法模拟选定的地热资源有利区的温度变化, 结果发现河间潜山合理的开采井距为 800 m, 合理开采量为 60 L/s, 回灌温度为 35 ℃, 总可开采量为 6.32×1016 J, 单年可开采量为6.32×1014 J, 可供暖面积为1.22×106 m2, 对于冀中坳陷潜山地热资源的开发利用具有一定的指导意义。Abstract: Buried hill geothermal reservoirs have the advantages of large heat reservoirs and thickness, developed pores and cracks, and abundant geothermal water resources. The buried hills in the Jizhong depression are densely distributed and rich in geothermal resources. Hejian buried hill is located centrally to the east of Raoyang Sag in the Jizhong depression. The study area has excellent geothermal geological conditions and high potential for development and utilization. Logging data and thermophysical properties of rocks in the Hejian buried hill and its surrounding areas reveal that the present-day geothermal gradient ranges from 29.8 °C/km to 44.5 °C/km, with an average of 40.7 °C/km, and the terrestrial heat flow ranges from 64.8 mW/m2 to 80.6 mW/m2, with an average of 73.4 mW/m2. Based on the favorable areas of geothermal resources development, the temperature changes in the reservoir during geothermal reinjection are simulated using the hydrothermal coupled method to study optimization of exploitation operation. The reasonable distance between the production and rejection wells is 800 m, production mass flow rate is 60 L/s, reasonable reinjection water temperature is 35 °C, total production is 6.32×1016 J, annual production is 6.32×1014 J, and the annual geothermal resource can meet the indoor heating demand of 1.22×106 m2. This has guiding significance for the development and utilization of buried hill geothermal resources in the Jizhong Depression.
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