雾迷山组热储地热资源采灌平衡研究

Recently, the exploitation and utilization of geothermal resources porous-type reservoirs of are increasing in scale, which plays an important role in economic prosperity and environmental development; however, overexploitation and improper maintenance of geothermal field will lead to a shortage of geothermal enegy. As a new method, reinjection is essential to realize renewable and sustainable exploitation and utilization of geothermal resources. The Wumishan Group reservoir in Tianjin area is well exploited both in scale and in range. Although the deep exploitation of these thermal reservoirs has reached a comprehensive stage, there is still a gap between extraction and injection equilibrium. Therefore, this program aims to analyze characteristics and laws of the temperature field and pressure field of thermal reservoirs in the Wumishan Group based on a large scale of dynamic monitoring data from geothermal well group. In addition, numerical modeling is applied to estimate dynamic variation of geothermal fluids using TOUGH 2 software. Finally, by analyzing hydrogeology parameter, boundary values and other equalization terms, a model corresponding with hydrogeology conditions in Tianjin area can be set up to quantificationally study on the recharge and discharge of the simulation area, to predict the pressure of geothermal fluids under the scheme for exploitation and utilization of a given fluids and to realize the three-dimensional visualization of a numerical model. Theoretically, this work scientifically improves the model of extraction-injection equilibrium of geothermal resources in carbonate area and practically, provides important clues for the sustainable exploitation of deep geothermal resources in Beijing-Tianjin-Hebei Economic Area.

近年来，开发利用裂隙型储层地热资源规模呈逐年增大趋势，为推动经济和环境发展发挥了巨大的作用。但是，持续的、过度的开采或热田养护不当会导致携带热能的地热流体枯竭，回灌式开采是一种新的地热开发利用方式，是实现地热资源成为真正的可再生能源的必由之路。天津地区雾迷山组热储层地热资源开采利用规模大、范围广，随着全面进入深度开采阶段，发现距离达到采灌平衡存在很大差距。本项目拟利用规模化地热井群动态监测数据分析雾迷山组热储温度场、压力场等变化特征和规律，使用TOUGH2软件进行地热流体动态变化情况数值模拟，通过识别水文地质参数、边界值和其它均衡项，建立符合研究区水文地质条件的模型，进而更精确地定量研究模拟区的补给与排泄，预报给定流体资源开发利用方案下的热流体压力，实现模型三维可视化效果，最终理论上完善碳酸盐岩地热资源采灌平衡科学模型，实践上为京津冀深部地热资源可持续开发提供重要的科学预测。

天津地区雾迷山组热储地热资源开采进入深度开采阶段，形成了大规模采灌利用模式。本项目以建立更加科学的采灌平衡模型（地热资源大规模采灌模式下的可持续开发）为研究内容。开展雾迷山组热储水动力场、温度场、化学场研究；开展典型井群示踪试验；开展科学采灌平衡模型和开发利用方案研究，为京津冀深部地热资源可持续开发提供实践指导。项目研究方法在勘探阶段地热资源开发利用具有推广性。